author | dl |
Fri, 23 Sep 2016 13:24:33 -0700 | |
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/* |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file: |
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* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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*/ |
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package java.util.concurrent; |
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import java.lang.Thread.UncaughtExceptionHandler; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.VarHandle; |
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import java.security.AccessControlContext; |
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import java.security.Permissions; |
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import java.security.ProtectionDomain; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.Collections; |
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import java.util.List; |
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import java.util.function.Predicate; |
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import java.util.concurrent.locks.LockSupport; |
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/** |
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* An {@link ExecutorService} for running {@link ForkJoinTask}s. |
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* A {@code ForkJoinPool} provides the entry point for submissions |
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* from non-{@code ForkJoinTask} clients, as well as management and |
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* monitoring operations. |
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* |
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* <p>A {@code ForkJoinPool} differs from other kinds of {@link |
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* ExecutorService} mainly by virtue of employing |
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* <em>work-stealing</em>: all threads in the pool attempt to find and |
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* execute tasks submitted to the pool and/or created by other active |
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* tasks (eventually blocking waiting for work if none exist). This |
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* enables efficient processing when most tasks spawn other subtasks |
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* (as do most {@code ForkJoinTask}s), as well as when many small |
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* tasks are submitted to the pool from external clients. Especially |
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* when setting <em>asyncMode</em> to true in constructors, {@code |
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* ForkJoinPool}s may also be appropriate for use with event-style |
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* tasks that are never joined. |
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* |
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* <p>A static {@link #commonPool()} is available and appropriate for |
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* most applications. The common pool is used by any ForkJoinTask that |
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* is not explicitly submitted to a specified pool. Using the common |
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* pool normally reduces resource usage (its threads are slowly |
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* reclaimed during periods of non-use, and reinstated upon subsequent |
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* use). |
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* |
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* <p>For applications that require separate or custom pools, a {@code |
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* ForkJoinPool} may be constructed with a given target parallelism |
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* level; by default, equal to the number of available processors. |
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* The pool attempts to maintain enough active (or available) threads |
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* by dynamically adding, suspending, or resuming internal worker |
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* threads, even if some tasks are stalled waiting to join others. |
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* However, no such adjustments are guaranteed in the face of blocked |
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* I/O or other unmanaged synchronization. The nested {@link |
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* ManagedBlocker} interface enables extension of the kinds of |
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* synchronization accommodated. The default policies may be |
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* overridden using a constructor with parameters corresponding to |
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* those documented in class {@link ThreadPoolExecutor}. |
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* |
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* <p>In addition to execution and lifecycle control methods, this |
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* class provides status check methods (for example |
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* {@link #getStealCount}) that are intended to aid in developing, |
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* tuning, and monitoring fork/join applications. Also, method |
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* {@link #toString} returns indications of pool state in a |
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* convenient form for informal monitoring. |
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* |
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* <p>As is the case with other ExecutorServices, there are three |
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* main task execution methods summarized in the following table. |
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* These are designed to be used primarily by clients not already |
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* engaged in fork/join computations in the current pool. The main |
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* forms of these methods accept instances of {@code ForkJoinTask}, |
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* but overloaded forms also allow mixed execution of plain {@code |
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* Runnable}- or {@code Callable}- based activities as well. However, |
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* tasks that are already executing in a pool should normally instead |
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* use the within-computation forms listed in the table unless using |
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* async event-style tasks that are not usually joined, in which case |
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* there is little difference among choice of methods. |
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* |
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* <table BORDER CELLPADDING=3 CELLSPACING=1> |
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* <caption>Summary of task execution methods</caption> |
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* <tr> |
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* <td></td> |
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* <td ALIGN=CENTER> <b>Call from non-fork/join clients</b></td> |
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* <td ALIGN=CENTER> <b>Call from within fork/join computations</b></td> |
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* </tr> |
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* <tr> |
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* <td> <b>Arrange async execution</b></td> |
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* <td> {@link #execute(ForkJoinTask)}</td> |
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* <td> {@link ForkJoinTask#fork}</td> |
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* </tr> |
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* <tr> |
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* <td> <b>Await and obtain result</b></td> |
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* <td> {@link #invoke(ForkJoinTask)}</td> |
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* <td> {@link ForkJoinTask#invoke}</td> |
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* </tr> |
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* <tr> |
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* <td> <b>Arrange exec and obtain Future</b></td> |
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* <td> {@link #submit(ForkJoinTask)}</td> |
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* <td> {@link ForkJoinTask#fork} (ForkJoinTasks <em>are</em> Futures)</td> |
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* </tr> |
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* </table> |
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* |
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* <p>The common pool is by default constructed with default |
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* parameters, but these may be controlled by setting the following |
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* {@linkplain System#getProperty system properties}: |
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* <ul> |
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* <li>{@code java.util.concurrent.ForkJoinPool.common.parallelism} |
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* - the parallelism level, a non-negative integer |
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* <li>{@code java.util.concurrent.ForkJoinPool.common.threadFactory} |
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* - the class name of a {@link ForkJoinWorkerThreadFactory} |
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* <li>{@code java.util.concurrent.ForkJoinPool.common.exceptionHandler} |
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* - the class name of a {@link UncaughtExceptionHandler} |
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* <li>{@code java.util.concurrent.ForkJoinPool.common.maximumSpares} |
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* - the maximum number of allowed extra threads to maintain target |
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* parallelism (default 256). |
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* </ul> |
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* If a {@link SecurityManager} is present and no factory is |
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* specified, then the default pool uses a factory supplying |
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* threads that have no {@link Permissions} enabled. |
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* The system class loader is used to load these classes. |
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* Upon any error in establishing these settings, default parameters |
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* are used. It is possible to disable or limit the use of threads in |
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* the common pool by setting the parallelism property to zero, and/or |
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* using a factory that may return {@code null}. However doing so may |
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* cause unjoined tasks to never be executed. |
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* |
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* <p><b>Implementation notes</b>: This implementation restricts the |
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* maximum number of running threads to 32767. Attempts to create |
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* pools with greater than the maximum number result in |
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* {@code IllegalArgumentException}. |
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* |
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* <p>This implementation rejects submitted tasks (that is, by throwing |
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* {@link RejectedExecutionException}) only when the pool is shut down |
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* or internal resources have been exhausted. |
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* |
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* @since 1.7 |
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* @author Doug Lea |
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*/ |
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public class ForkJoinPool extends AbstractExecutorService { |
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/* |
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* Implementation Overview |
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* |
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* This class and its nested classes provide the main |
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* functionality and control for a set of worker threads: |
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* Submissions from non-FJ threads enter into submission queues. |
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* Workers take these tasks and typically split them into subtasks |
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* that may be stolen by other workers. Preference rules give |
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* first priority to processing tasks from their own queues (LIFO |
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* or FIFO, depending on mode), then to randomized FIFO steals of |
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* tasks in other queues. This framework began as vehicle for |
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* supporting tree-structured parallelism using work-stealing. |
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* Over time, its scalability advantages led to extensions and |
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* changes to better support more diverse usage contexts. Because |
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* most internal methods and nested classes are interrelated, |
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* their main rationale and descriptions are presented here; |
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* individual methods and nested classes contain only brief |
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* comments about details. |
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* |
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* WorkQueues |
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* ========== |
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* |
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* Most operations occur within work-stealing queues (in nested |
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* class WorkQueue). These are special forms of Deques that |
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* support only three of the four possible end-operations -- push, |
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* pop, and poll (aka steal), under the further constraints that |
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* push and pop are called only from the owning thread (or, as |
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* extended here, under a lock), while poll may be called from |
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* other threads. (If you are unfamiliar with them, you probably |
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* want to read Herlihy and Shavit's book "The Art of |
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* Multiprocessor programming", chapter 16 describing these in |
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* more detail before proceeding.) The main work-stealing queue |
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* design is roughly similar to those in the papers "Dynamic |
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* Circular Work-Stealing Deque" by Chase and Lev, SPAA 2005 |
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* (http://research.sun.com/scalable/pubs/index.html) and |
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* "Idempotent work stealing" by Michael, Saraswat, and Vechev, |
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* PPoPP 2009 (http://portal.acm.org/citation.cfm?id=1504186). |
26448 | 207 |
* The main differences ultimately stem from GC requirements that |
208 |
* we null out taken slots as soon as we can, to maintain as small |
|
209 |
* a footprint as possible even in programs generating huge |
|
210 |
* numbers of tasks. To accomplish this, we shift the CAS |
|
211 |
* arbitrating pop vs poll (steal) from being on the indices |
|
212 |
* ("base" and "top") to the slots themselves. |
|
213 |
* |
|
32988 | 214 |
* Adding tasks then takes the form of a classic array push(task) |
215 |
* in a circular buffer: |
|
216 |
* q.array[q.top++ % length] = task; |
|
26448 | 217 |
* |
218 |
* (The actual code needs to null-check and size-check the array, |
|
32988 | 219 |
* uses masking, not mod, for indexing a power-of-two-sized array, |
220 |
* properly fences accesses, and possibly signals waiting workers |
|
221 |
* to start scanning -- see below.) Both a successful pop and |
|
222 |
* poll mainly entail a CAS of a slot from non-null to null. |
|
26448 | 223 |
* |
224 |
* The pop operation (always performed by owner) is: |
|
32988 | 225 |
* if ((the task at top slot is not null) and |
26448 | 226 |
* (CAS slot to null)) |
227 |
* decrement top and return task; |
|
228 |
* |
|
229 |
* And the poll operation (usually by a stealer) is |
|
32988 | 230 |
* if ((the task at base slot is not null) and |
26448 | 231 |
* (CAS slot to null)) |
232 |
* increment base and return task; |
|
233 |
* |
|
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* There are several variants of each of these. In particular, |
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* almost all uses of poll occur within scan operations that also |
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* interleave contention tracking (with associated code sprawl.) |
32988 | 237 |
* |
238 |
* Memory ordering. See "Correct and Efficient Work-Stealing for |
|
239 |
* Weak Memory Models" by Le, Pop, Cohen, and Nardelli, PPoPP 2013 |
|
240 |
* (http://www.di.ens.fr/~zappa/readings/ppopp13.pdf) for an |
|
241 |
* analysis of memory ordering requirements in work-stealing |
|
242 |
* algorithms similar to (but different than) the one used here. |
|
243 |
* Extracting tasks in array slots via (fully fenced) CAS provides |
|
244 |
* primary synchronization. The base and top indices imprecisely |
|
245 |
* guide where to extract from. We do not always require strict |
|
246 |
* orderings of array and index updates, so sometimes let them be |
|
247 |
* subject to compiler and processor reorderings. However, the |
|
248 |
* volatile "base" index also serves as a basis for memory |
|
249 |
* ordering: Slot accesses are preceded by a read of base, |
|
250 |
* ensuring happens-before ordering with respect to stealers (so |
|
251 |
* the slots themselves can be read via plain array reads.) The |
|
252 |
* only other memory orderings relied on are maintained in the |
|
253 |
* course of signalling and activation (see below). A check that |
|
254 |
* base == top indicates (momentary) emptiness, but otherwise may |
|
255 |
* err on the side of possibly making the queue appear nonempty |
|
256 |
* when a push, pop, or poll have not fully committed, or making |
|
257 |
* it appear empty when an update of top has not yet been visibly |
|
258 |
* written. (Method isEmpty() checks the case of a partially |
|
26448 | 259 |
* completed removal of the last element.) Because of this, the |
260 |
* poll operation, considered individually, is not wait-free. One |
|
261 |
* thief cannot successfully continue until another in-progress |
|
32988 | 262 |
* one (or, if previously empty, a push) visibly completes. |
263 |
* However, in the aggregate, we ensure at least probabilistic |
|
264 |
* non-blockingness. If an attempted steal fails, a scanning |
|
265 |
* thief chooses a different random victim target to try next. So, |
|
266 |
* in order for one thief to progress, it suffices for any |
|
18790 | 267 |
* in-progress poll or new push on any empty queue to |
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* complete. |
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* |
26448 | 270 |
* This approach also enables support of a user mode in which |
271 |
* local task processing is in FIFO, not LIFO order, simply by |
|
272 |
* using poll rather than pop. This can be useful in |
|
273 |
* message-passing frameworks in which tasks are never joined. |
|
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* |
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* WorkQueues are also used in a similar way for tasks submitted |
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* to the pool. We cannot mix these tasks in the same queues used |
26448 | 277 |
* by workers. Instead, we randomly associate submission queues |
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* with submitting threads, using a form of hashing. The |
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* ThreadLocalRandom probe value serves as a hash code for |
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* choosing existing queues, and may be randomly repositioned upon |
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281 |
* contention with other submitters. In essence, submitters act |
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* like workers except that they are restricted to executing local |
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* tasks that they submitted. Insertion of tasks in shared mode |
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|
284 |
* requires a lock but we use only a simple spinlock (using field |
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|
285 |
* phase), because submitters encountering a busy queue move to a |
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|
286 |
* different position to use or create other queues -- they block |
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|
287 |
* only when creating and registering new queues. Because it is |
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|
288 |
* used only as a spinlock, unlocking requires only a "releasing" |
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|
289 |
* store (using setRelease). |
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* |
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291 |
* Management |
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|
292 |
* ========== |
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293 |
* |
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294 |
* The main throughput advantages of work-stealing stem from |
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295 |
* decentralized control -- workers mostly take tasks from |
26448 | 296 |
* themselves or each other, at rates that can exceed a billion |
297 |
* per second. The pool itself creates, activates (enables |
|
298 |
* scanning for and running tasks), deactivates, blocks, and |
|
299 |
* terminates threads, all with minimal central information. |
|
300 |
* There are only a few properties that we can globally track or |
|
301 |
* maintain, so we pack them into a small number of variables, |
|
302 |
* often maintaining atomicity without blocking or locking. |
|
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303 |
* Nearly all essentially atomic control state is held in a few |
26448 | 304 |
* volatile variables that are by far most often read (not |
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|
305 |
* written) as status and consistency checks. We pack as much |
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|
306 |
* information into them as we can. |
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* |
26448 | 308 |
* Field "ctl" contains 64 bits holding information needed to |
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|
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* atomically decide to add, enqueue (on an event queue), and |
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|
310 |
* dequeue (and release)-activate workers. To enable this |
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|
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* packing, we restrict maximum parallelism to (1<<15)-1 (which is |
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|
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* far in excess of normal operating range) to allow ids, counts, |
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|
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* and their negations (used for thresholding) to fit into 16bit |
26448 | 314 |
* subfields. |
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* |
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316 |
* Field "mode" holds configuration parameters as well as lifetime |
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|
317 |
* status, atomically and monotonically setting SHUTDOWN, STOP, |
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|
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* and finally TERMINATED bits. |
26448 | 319 |
* |
32988 | 320 |
* Field "workQueues" holds references to WorkQueues. It is |
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|
321 |
* updated (only during worker creation and termination) under |
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|
322 |
* lock (using field workerNamePrefix as lock), but is otherwise |
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|
323 |
* concurrently readable, and accessed directly. We also ensure |
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|
324 |
* that uses of the array reference itself never become too stale |
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|
325 |
* in case of resizing. To simplify index-based operations, the |
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|
326 |
* array size is always a power of two, and all readers must |
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|
327 |
* tolerate null slots. Worker queues are at odd indices. Shared |
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|
328 |
* (submission) queues are at even indices, up to a maximum of 64 |
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|
329 |
* slots, to limit growth even if array needs to expand to add |
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|
330 |
* more workers. Grouping them together in this way simplifies and |
32988 | 331 |
* speeds up task scanning. |
6543 | 332 |
* |
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* All worker thread creation is on-demand, triggered by task |
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|
334 |
* submissions, replacement of terminated workers, and/or |
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|
335 |
* compensation for blocked workers. However, all other support |
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|
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* code is set up to work with other policies. To ensure that we |
32988 | 337 |
* do not hold on to worker references that would prevent GC, all |
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* accesses to workQueues are via indices into the workQueues |
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* array (which is one source of some of the messy code |
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340 |
* constructions here). In essence, the workQueues array serves as |
26448 | 341 |
* a weak reference mechanism. Thus for example the stack top |
342 |
* subfield of ctl stores indices, not references. |
|
343 |
* |
|
344 |
* Queuing Idle Workers. Unlike HPC work-stealing frameworks, we |
|
345 |
* cannot let workers spin indefinitely scanning for tasks when |
|
346 |
* none can be found immediately, and we cannot start/resume |
|
347 |
* workers unless there appear to be tasks available. On the |
|
348 |
* other hand, we must quickly prod them into action when new |
|
349 |
* tasks are submitted or generated. In many usages, ramp-up time |
|
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* is the main limiting factor in overall performance, which is |
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|
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* compounded at program start-up by JIT compilation and |
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|
352 |
* allocation. So we streamline this as much as possible. |
26448 | 353 |
* |
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354 |
* The "ctl" field atomically maintains total worker and |
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355 |
* "released" worker counts, plus the head of the available worker |
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|
356 |
* queue (actually stack, represented by the lower 32bit subfield |
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|
357 |
* of ctl). Released workers are those known to be scanning for |
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|
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* and/or running tasks. Unreleased ("available") workers are |
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|
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* recorded in the ctl stack. These workers are made available for |
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|
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* signalling by enqueuing in ctl (see method runWorker). The |
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|
361 |
* "queue" is a form of Treiber stack. This is ideal for |
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362 |
* activating threads in most-recently used order, and improves |
26448 | 363 |
* performance and locality, outweighing the disadvantages of |
364 |
* being prone to contention and inability to release a worker |
|
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* unless it is topmost on stack. To avoid missed signal problems |
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* inherent in any wait/signal design, available workers rescan |
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* for (and if found run) tasks after enqueuing. Normally their |
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368 |
* release status will be updated while doing so, but the released |
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* worker ctl count may underestimate the number of active |
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|
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* threads. (However, it is still possible to determine quiescence |
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|
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* via a validation traversal -- see isQuiescent). After an |
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|
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* unsuccessful rescan, available workers are blocked until |
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|
373 |
* signalled (see signalWork). The top stack state holds the |
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|
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* value of the "phase" field of the worker: its index and status, |
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|
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* plus a version counter that, in addition to the count subfields |
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|
376 |
* (also serving as version stamps) provide protection against |
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|
377 |
* Treiber stack ABA effects. |
26448 | 378 |
* |
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* Creating workers. To create a worker, we pre-increment counts |
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|
380 |
* (serving as a reservation), and attempt to construct a |
26448 | 381 |
* ForkJoinWorkerThread via its factory. Upon construction, the |
382 |
* new thread invokes registerWorker, where it constructs a |
|
383 |
* WorkQueue and is assigned an index in the workQueues array |
|
32988 | 384 |
* (expanding the array if necessary). The thread is then started. |
385 |
* Upon any exception across these steps, or null return from |
|
386 |
* factory, deregisterWorker adjusts counts and records |
|
26448 | 387 |
* accordingly. If a null return, the pool continues running with |
388 |
* fewer than the target number workers. If exceptional, the |
|
389 |
* exception is propagated, generally to some external caller. |
|
390 |
* Worker index assignment avoids the bias in scanning that would |
|
391 |
* occur if entries were sequentially packed starting at the front |
|
392 |
* of the workQueues array. We treat the array as a simple |
|
393 |
* power-of-two hash table, expanding as needed. The seedIndex |
|
394 |
* increment ensures no collisions until a resize is needed or a |
|
395 |
* worker is deregistered and replaced, and thereafter keeps |
|
396 |
* probability of collision low. We cannot use |
|
397 |
* ThreadLocalRandom.getProbe() for similar purposes here because |
|
398 |
* the thread has not started yet, but do so for creating |
|
32988 | 399 |
* submission queues for existing external threads (see |
400 |
* externalPush). |
|
401 |
* |
|
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|
402 |
* WorkQueue field "phase" is used by both workers and the pool to |
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|
403 |
* manage and track whether a worker is UNSIGNALLED (possibly |
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|
404 |
* blocked waiting for a signal). When a worker is enqueued its |
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|
405 |
* phase field is set. Note that phase field updates lag queue CAS |
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|
406 |
* releases so usage requires care -- seeing a negative phase does |
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|
407 |
* not guarantee that the worker is available. When queued, the |
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|
408 |
* lower 16 bits of scanState must hold its pool index. So we |
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|
409 |
* place the index there upon initialization (see registerWorker) |
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|
410 |
* and otherwise keep it there or restore it when necessary. |
32988 | 411 |
* |
412 |
* The ctl field also serves as the basis for memory |
|
413 |
* synchronization surrounding activation. This uses a more |
|
414 |
* efficient version of a Dekker-like rule that task producers and |
|
415 |
* consumers sync with each other by both writing/CASing ctl (even |
|
416 |
* if to its current value). This would be extremely costly. So |
|
417 |
* we relax it in several ways: (1) Producers only signal when |
|
418 |
* their queue is empty. Other workers propagate this signal (in |
|
39723
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|
419 |
* method scan) when they find tasks; to further reduce flailing, |
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|
420 |
* each worker signals only one other per activation. (2) Workers |
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|
421 |
* only enqueue after scanning (see below) and not finding any |
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|
422 |
* tasks. (3) Rather than CASing ctl to its current value in the |
9aa34e4a0469
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|
423 |
* common case where no action is required, we reduce write |
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|
424 |
* contention by equivalently prefacing signalWork when called by |
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|
425 |
* an external task producer using a memory access with |
9aa34e4a0469
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|
426 |
* full-volatile semantics or a "fullFence". |
32988 | 427 |
* |
428 |
* Almost always, too many signals are issued. A task producer |
|
429 |
* cannot in general tell if some existing worker is in the midst |
|
430 |
* of finishing one task (or already scanning) and ready to take |
|
431 |
* another without being signalled. So the producer might instead |
|
432 |
* activate a different worker that does not find any work, and |
|
433 |
* then inactivates. This scarcely matters in steady-state |
|
434 |
* computations involving all workers, but can create contention |
|
435 |
* and bookkeeping bottlenecks during ramp-up, ramp-down, and small |
|
436 |
* computations involving only a few workers. |
|
437 |
* |
|
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|
438 |
* Scanning. Method runWorker performs top-level scanning for |
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|
439 |
* tasks. Each scan traverses and tries to poll from each queue |
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|
440 |
* starting at a random index and circularly stepping. Scans are |
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|
441 |
* not performed in ideal random permutation order, to reduce |
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|
442 |
* cacheline contention. The pseudorandom generator need not have |
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|
443 |
* high-quality statistical properties in the long term, but just |
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changeset
|
444 |
* within computations; We use Marsaglia XorShifts (often via |
9aa34e4a0469
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changeset
|
445 |
* ThreadLocalRandom.nextSecondarySeed), which are cheap and |
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changeset
|
446 |
* suffice. Scanning also employs contention reduction: When |
9aa34e4a0469
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|
447 |
* scanning workers fail to extract an apparently existing task, |
9aa34e4a0469
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changeset
|
448 |
* they soon restart at a different pseudorandom index. This |
9aa34e4a0469
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changeset
|
449 |
* improves throughput when many threads are trying to take tasks |
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|
450 |
* from few queues, which can be common in some usages. Scans do |
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|
451 |
* not otherwise explicitly take into account core affinities, |
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|
452 |
* loads, cache localities, etc, However, they do exploit temporal |
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|
453 |
* locality (which usually approximates these) by preferring to |
9aa34e4a0469
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|
454 |
* re-poll (at most #workers times) from the same queue after a |
9aa34e4a0469
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changeset
|
455 |
* successful poll before trying others. |
8765
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|
456 |
* |
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|
457 |
* Trimming workers. To release resources after periods of lack of |
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changeset
|
458 |
* use, a worker starting to wait when the pool is quiescent will |
39723
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|
459 |
* time out and terminate (see method scan) if the pool has |
9aa34e4a0469
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changeset
|
460 |
* remained quiescent for period given by field keepAlive. |
8765
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|
461 |
* |
26448 | 462 |
* Shutdown and Termination. A call to shutdownNow invokes |
463 |
* tryTerminate to atomically set a runState bit. The calling |
|
464 |
* thread, as well as every other worker thereafter terminating, |
|
39723
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changeset
|
465 |
* helps terminate others by cancelling their unprocessed tasks, |
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changeset
|
466 |
* and waking them up, doing so repeatedly until stable. Calls to |
9aa34e4a0469
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changeset
|
467 |
* non-abrupt shutdown() preface this by checking whether |
9aa34e4a0469
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|
468 |
* termination should commence by sweeping through queues (until |
9aa34e4a0469
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changeset
|
469 |
* stable) to ensure lack of in-flight submissions and workers |
9aa34e4a0469
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changeset
|
470 |
* about to process them before triggering the "STOP" phase of |
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changeset
|
471 |
* termination. |
26448 | 472 |
* |
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|
473 |
* Joining Tasks |
69bfd88e3ea1
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|
474 |
* ============= |
69bfd88e3ea1
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changeset
|
475 |
* |
69bfd88e3ea1
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|
476 |
* Any of several actions may be taken when one worker is waiting |
69bfd88e3ea1
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changeset
|
477 |
* to join a task stolen (or always held) by another. Because we |
69bfd88e3ea1
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changeset
|
478 |
* are multiplexing many tasks on to a pool of workers, we can't |
39723
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changeset
|
479 |
* always just let them block (as in Thread.join). We also cannot |
9aa34e4a0469
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diff
changeset
|
480 |
* just reassign the joiner's run-time stack with another and |
9aa34e4a0469
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parents:
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changeset
|
481 |
* replace it later, which would be a form of "continuation", that |
9aa34e4a0469
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parents:
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diff
changeset
|
482 |
* even if possible is not necessarily a good idea since we may |
9aa34e4a0469
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parents:
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diff
changeset
|
483 |
* need both an unblocked task and its continuation to progress. |
9aa34e4a0469
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parents:
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diff
changeset
|
484 |
* Instead we combine two tactics: |
6543 | 485 |
* |
486 |
* Helping: Arranging for the joiner to execute some task that it |
|
14914
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changeset
|
487 |
* would be running if the steal had not occurred. |
6543 | 488 |
* |
489 |
* Compensating: Unless there are already enough live threads, |
|
14914
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changeset
|
490 |
* method tryCompensate() may create or re-activate a spare |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
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changeset
|
491 |
* thread to compensate for blocked joiners until they unblock. |
69bfd88e3ea1
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parents:
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changeset
|
492 |
* |
69bfd88e3ea1
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changeset
|
493 |
* A third form (implemented in tryRemoveAndExec) amounts to |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
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parents:
11279
diff
changeset
|
494 |
* helping a hypothetical compensator: If we can readily tell that |
69bfd88e3ea1
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dl
parents:
11279
diff
changeset
|
495 |
* a possible action of a compensator is to steal and execute the |
69bfd88e3ea1
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dl
parents:
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diff
changeset
|
496 |
* task being joined, the joining thread can do so directly, |
39723
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parents:
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diff
changeset
|
497 |
* without the need for a compensation thread. |
6543 | 498 |
* |
499 |
* The ManagedBlocker extension API can't use helping so relies |
|
500 |
* only on compensation in method awaitBlocker. |
|
501 |
* |
|
39723
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diff
changeset
|
502 |
* The algorithm in awaitJoin entails a form of "linear helping". |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
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diff
changeset
|
503 |
* Each worker records (in field source) the id of the queue from |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
504 |
* which it last stole a task. The scan in method awaitJoin uses |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
505 |
* these markers to try to find a worker to help (i.e., steal back |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
506 |
* a task from and execute it) that could hasten completion of the |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
507 |
* actively joined task. Thus, the joiner executes a task that |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
508 |
* would be on its own local deque if the to-be-joined task had |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
509 |
* not been stolen. This is a conservative variant of the approach |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
510 |
* described in Wagner & Calder "Leapfrogging: a portable |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
511 |
* technique for implementing efficient futures" SIGPLAN Notices, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
512 |
* 1993 (http://portal.acm.org/citation.cfm?id=155354). It differs |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
513 |
* mainly in that we only record queue ids, not full dependency |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
514 |
* links. This requires a linear scan of the workQueues array to |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
515 |
* locate stealers, but isolates cost to when it is needed, rather |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
516 |
* than adding to per-task overhead. Searches can fail to locate |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
517 |
* stealers GC stalls and the like delay recording sources. |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
518 |
* Further, even when accurately identified, stealers might not |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
519 |
* ever produce a task that the joiner can in turn help with. So, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
520 |
* compensation is tried upon failure to find tasks to run. |
14914
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8002356: Add ForkJoin common pool and CountedCompleter
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changeset
|
521 |
* |
39723
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diff
changeset
|
522 |
* Compensation does not by default aim to keep exactly the target |
26448 | 523 |
* parallelism number of unblocked threads running at any given |
524 |
* time. Some previous versions of this class employed immediate |
|
525 |
* compensations for any blocked join. However, in practice, the |
|
526 |
* vast majority of blockages are transient byproducts of GC and |
|
527 |
* other JVM or OS activities that are made worse by replacement. |
|
39723
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diff
changeset
|
528 |
* Rather than impose arbitrary policies, we allow users to |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
529 |
* override the default of only adding threads upon apparent |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
530 |
* starvation. The compensation mechanism may also be bounded. |
9aa34e4a0469
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dl
parents:
37782
diff
changeset
|
531 |
* Bounds for the commonPool (see COMMON_MAX_SPARES) better enable |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
532 |
* JVMs to cope with programming errors and abuse before running |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
533 |
* out of resources to do so. |
14914
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changeset
|
534 |
* |
69bfd88e3ea1
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changeset
|
535 |
* Common Pool |
69bfd88e3ea1
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changeset
|
536 |
* =========== |
6543 | 537 |
* |
18790 | 538 |
* The static common pool always exists after static |
14914
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changeset
|
539 |
* initialization. Since it (or any other created pool) need |
69bfd88e3ea1
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parents:
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diff
changeset
|
540 |
* never be used, we minimize initial construction overhead and |
39723
9aa34e4a0469
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diff
changeset
|
541 |
* footprint to the setup of about a dozen fields. |
6543 | 542 |
* |
14914
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parents:
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diff
changeset
|
543 |
* When external threads submit to the common pool, they can |
26448 | 544 |
* perform subtask processing (see externalHelpComplete and |
545 |
* related methods) upon joins. This caller-helps policy makes it |
|
546 |
* sensible to set common pool parallelism level to one (or more) |
|
547 |
* less than the total number of available cores, or even zero for |
|
548 |
* pure caller-runs. We do not need to record whether external |
|
549 |
* submissions are to the common pool -- if not, external help |
|
550 |
* methods return quickly. These submitters would otherwise be |
|
551 |
* blocked waiting for completion, so the extra effort (with |
|
552 |
* liberally sprinkled task status checks) in inapplicable cases |
|
553 |
* amounts to an odd form of limited spin-wait before blocking in |
|
554 |
* ForkJoinTask.join. |
|
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|
555 |
* |
22070 | 556 |
* As a more appropriate default in managed environments, unless |
557 |
* overridden by system properties, we use workers of subclass |
|
558 |
* InnocuousForkJoinWorkerThread when there is a SecurityManager |
|
559 |
* present. These workers have no permissions set, do not belong |
|
560 |
* to any user-defined ThreadGroup, and erase all ThreadLocals |
|
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|
561 |
* after executing any top-level task (see |
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|
562 |
* WorkQueue.afterTopLevelExec). The associated mechanics (mainly |
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|
563 |
* in ForkJoinWorkerThread) may be JVM-dependent and must access |
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|
564 |
* particular Thread class fields to achieve this effect. |
22070 | 565 |
* |
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|
566 |
* Style notes |
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|
567 |
* =========== |
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|
568 |
* |
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|
569 |
* Memory ordering relies mainly on VarHandles. This can be |
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|
570 |
* awkward and ugly, but also reflects the need to control |
26448 | 571 |
* outcomes across the unusual cases that arise in very racy code |
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|
572 |
* with very few invariants. All fields are read into locals |
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|
573 |
* before use, and null-checked if they are references. This is |
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|
574 |
* usually done in a "C"-like style of listing declarations at the |
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|
575 |
* heads of methods or blocks, and using inline assignments on |
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|
576 |
* first encounter. Nearly all explicit checks lead to |
26448 | 577 |
* bypass/return, not exception throws, because they may |
578 |
* legitimately arise due to cancellation/revocation during |
|
579 |
* shutdown. |
|
580 |
* |
|
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|
581 |
* There is a lot of representation-level coupling among classes |
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|
582 |
* ForkJoinPool, ForkJoinWorkerThread, and ForkJoinTask. The |
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|
583 |
* fields of WorkQueue maintain data structures managed by |
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|
584 |
* ForkJoinPool, so are directly accessed. There is little point |
6543 | 585 |
* trying to reduce this, since any associated future changes in |
586 |
* representations will need to be accompanied by algorithmic |
|
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|
587 |
* changes anyway. Several methods intrinsically sprawl because |
26448 | 588 |
* they must accumulate sets of consistent reads of fields held in |
589 |
* local variables. There are also other coding oddities |
|
590 |
* (including several unnecessary-looking hoisted null checks) |
|
591 |
* that help some methods perform reasonably even when interpreted |
|
592 |
* (not compiled). |
|
6543 | 593 |
* |
26448 | 594 |
* The order of declarations in this file is (with a few exceptions): |
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|
595 |
* (1) Static utility functions |
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|
596 |
* (2) Nested (static) classes |
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|
597 |
* (3) Static fields |
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|
598 |
* (4) Fields, along with constants used when unpacking some of them |
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|
599 |
* (5) Internal control methods |
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|
600 |
* (6) Callbacks and other support for ForkJoinTask methods |
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|
601 |
* (7) Exported methods |
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|
602 |
* (8) Static block initializing statics in minimally dependent order |
4110 | 603 |
*/ |
604 |
||
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|
605 |
// Static utilities |
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|
606 |
|
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|
607 |
/** |
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|
608 |
* If there is a security manager, makes sure caller has |
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|
609 |
* permission to modify threads. |
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|
610 |
*/ |
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|
611 |
private static void checkPermission() { |
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|
612 |
SecurityManager security = System.getSecurityManager(); |
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|
613 |
if (security != null) |
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|
614 |
security.checkPermission(modifyThreadPermission); |
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|
615 |
} |
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|
616 |
|
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|
617 |
// Nested classes |
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|
618 |
|
4110 | 619 |
/** |
620 |
* Factory for creating new {@link ForkJoinWorkerThread}s. |
|
621 |
* A {@code ForkJoinWorkerThreadFactory} must be defined and used |
|
622 |
* for {@code ForkJoinWorkerThread} subclasses that extend base |
|
623 |
* functionality or initialize threads with different contexts. |
|
624 |
*/ |
|
625 |
public static interface ForkJoinWorkerThreadFactory { |
|
626 |
/** |
|
627 |
* Returns a new worker thread operating in the given pool. |
|
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|
628 |
* Returning null or throwing an exception may result in tasks |
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|
629 |
* never being executed. If this method throws an exception, |
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|
630 |
* it is relayed to the caller of the method (for example |
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changeset
|
631 |
* {@code execute}) causing attempted thread creation. If this |
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|
632 |
* method returns null or throws an exception, it is not |
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|
633 |
* retried until the next attempted creation (for example |
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|
634 |
* another call to {@code execute}). |
4110 | 635 |
* |
636 |
* @param pool the pool this thread works in |
|
34341
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|
637 |
* @return the new worker thread, or {@code null} if the request |
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|
638 |
* to create a thread is rejected. |
4110 | 639 |
* @throws NullPointerException if the pool is null |
640 |
*/ |
|
641 |
public ForkJoinWorkerThread newThread(ForkJoinPool pool); |
|
642 |
} |
|
643 |
||
644 |
/** |
|
645 |
* Default ForkJoinWorkerThreadFactory implementation; creates a |
|
646 |
* new ForkJoinWorkerThread. |
|
647 |
*/ |
|
32988 | 648 |
private static final class DefaultForkJoinWorkerThreadFactory |
4110 | 649 |
implements ForkJoinWorkerThreadFactory { |
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|
650 |
public final ForkJoinWorkerThread newThread(ForkJoinPool pool) { |
6543 | 651 |
return new ForkJoinWorkerThread(pool); |
4110 | 652 |
} |
653 |
} |
|
654 |
||
26448 | 655 |
// Constants shared across ForkJoinPool and WorkQueue |
656 |
||
657 |
// Bounds |
|
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|
658 |
static final int SWIDTH = 16; // width of short |
26448 | 659 |
static final int SMASK = 0xffff; // short bits == max index |
660 |
static final int MAX_CAP = 0x7fff; // max #workers - 1 |
|
661 |
static final int SQMASK = 0x007e; // max 64 (even) slots |
|
662 |
||
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|
663 |
// Masks and units for WorkQueue.phase and ctl sp subfield |
32988 | 664 |
static final int UNSIGNALLED = 1 << 31; // must be negative |
26448 | 665 |
static final int SS_SEQ = 1 << 16; // version count |
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|
666 |
static final int QLOCK = 1; // must be 1 |
26448 | 667 |
|
39723
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changeset
|
668 |
// Mode bits and sentinels, some also used in WorkQueue id and.source fields |
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|
669 |
static final int OWNED = 1; // queue has owner thread |
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|
670 |
static final int FIFO = 1 << 16; // fifo queue or access mode |
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changeset
|
671 |
static final int SHUTDOWN = 1 << 18; |
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|
672 |
static final int TERMINATED = 1 << 19; |
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changeset
|
673 |
static final int STOP = 1 << 31; // must be negative |
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|
674 |
static final int QUIET = 1 << 30; // not scanning or working |
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changeset
|
675 |
static final int DORMANT = QUIET | UNSIGNALLED; |
32988 | 676 |
|
677 |
/** |
|
39723
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|
678 |
* The maximum number of local polls from the same queue before |
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|
679 |
* checking others. This is a safeguard against infinitely unfair |
9aa34e4a0469
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changeset
|
680 |
* looping under unbounded user task recursion, and must be larger |
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changeset
|
681 |
* than plausible cases of intentional bounded task recursion. |
32988 | 682 |
*/ |
39723
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|
683 |
static final int POLL_LIMIT = 1 << 10; |
26448 | 684 |
|
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|
685 |
/** |
69bfd88e3ea1
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|
686 |
* Queues supporting work-stealing as well as external task |
26448 | 687 |
* submission. See above for descriptions and algorithms. |
14914
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|
688 |
* Performance on most platforms is very sensitive to placement of |
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|
689 |
* instances of both WorkQueues and their arrays -- we absolutely |
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changeset
|
690 |
* do not want multiple WorkQueue instances or multiple queue |
26448 | 691 |
* arrays sharing cache lines. The @Contended annotation alerts |
692 |
* JVMs to try to keep instances apart. |
|
14914
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|
693 |
*/ |
34369
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8140687: Move @Contended to the jdk.internal.vm.annotation package
chegar
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changeset
|
694 |
@jdk.internal.vm.annotation.Contended |
14914
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|
695 |
static final class WorkQueue { |
26448 | 696 |
|
14914
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|
697 |
/** |
69bfd88e3ea1
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|
698 |
* Capacity of work-stealing queue array upon initialization. |
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changeset
|
699 |
* Must be a power of two; at least 4, but should be larger to |
69bfd88e3ea1
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changeset
|
700 |
* reduce or eliminate cacheline sharing among queues. |
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changeset
|
701 |
* Currently, it is much larger, as a partial workaround for |
69bfd88e3ea1
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changeset
|
702 |
* the fact that JVMs often place arrays in locations that |
69bfd88e3ea1
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changeset
|
703 |
* share GC bookkeeping (especially cardmarks) such that |
69bfd88e3ea1
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changeset
|
704 |
* per-write accesses encounter serious memory contention. |
69bfd88e3ea1
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changeset
|
705 |
*/ |
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changeset
|
706 |
static final int INITIAL_QUEUE_CAPACITY = 1 << 13; |
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changeset
|
707 |
|
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changeset
|
708 |
/** |
69bfd88e3ea1
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changeset
|
709 |
* Maximum size for queue arrays. Must be a power of two less |
69bfd88e3ea1
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changeset
|
710 |
* than or equal to 1 << (31 - width of array entry) to ensure |
69bfd88e3ea1
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changeset
|
711 |
* lack of wraparound of index calculations, but defined to a |
69bfd88e3ea1
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changeset
|
712 |
* value a bit less than this to help users trap runaway |
69bfd88e3ea1
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changeset
|
713 |
* programs before saturating systems. |
69bfd88e3ea1
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changeset
|
714 |
*/ |
69bfd88e3ea1
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changeset
|
715 |
static final int MAXIMUM_QUEUE_CAPACITY = 1 << 26; // 64M |
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changeset
|
716 |
|
26448 | 717 |
// Instance fields |
39723
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|
718 |
volatile int phase; // versioned, negative: queued, 1: locked |
9aa34e4a0469
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changeset
|
719 |
int stackPred; // pool stack (ctl) predecessor link |
14914
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|
720 |
int nsteals; // number of steals |
39723
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|
721 |
int id; // index, mode, tag |
9aa34e4a0469
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changeset
|
722 |
volatile int source; // source queue id, or sentinel |
14914
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|
723 |
volatile int base; // index of next slot for poll |
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changeset
|
724 |
int top; // index of next slot for push |
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changeset
|
725 |
ForkJoinTask<?>[] array; // the elements (initially unallocated) |
69bfd88e3ea1
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changeset
|
726 |
final ForkJoinPool pool; // the containing pool (may be null) |
69bfd88e3ea1
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changeset
|
727 |
final ForkJoinWorkerThread owner; // owning thread or null if shared |
69bfd88e3ea1
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changeset
|
728 |
|
26448 | 729 |
WorkQueue(ForkJoinPool pool, ForkJoinWorkerThread owner) { |
14914
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changeset
|
730 |
this.pool = pool; |
69bfd88e3ea1
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parents:
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diff
changeset
|
731 |
this.owner = owner; |
69bfd88e3ea1
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changeset
|
732 |
// Place indices in the center of array (that is not yet allocated) |
69bfd88e3ea1
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changeset
|
733 |
base = top = INITIAL_QUEUE_CAPACITY >>> 1; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
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changeset
|
734 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
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diff
changeset
|
735 |
|
69bfd88e3ea1
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changeset
|
736 |
/** |
26448 | 737 |
* Returns an exportable index (used by ForkJoinWorkerThread). |
738 |
*/ |
|
739 |
final int getPoolIndex() { |
|
39723
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8157523: Various improvements to ForkJoin/SubmissionPublisher code
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diff
changeset
|
740 |
return (id & 0xffff) >>> 1; // ignore odd/even tag bit |
26448 | 741 |
} |
742 |
||
743 |
/** |
|
14914
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changeset
|
744 |
* Returns the approximate number of tasks in the queue. |
69bfd88e3ea1
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changeset
|
745 |
*/ |
69bfd88e3ea1
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parents:
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changeset
|
746 |
final int queueSize() { |
32988 | 747 |
int n = base - top; // read base first |
14914
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changeset
|
748 |
return (n >= 0) ? 0 : -n; // ignore transient negative |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
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diff
changeset
|
749 |
} |
69bfd88e3ea1
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changeset
|
750 |
|
18790 | 751 |
/** |
14914
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changeset
|
752 |
* Provides a more accurate estimate of whether this queue has |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
753 |
* any tasks than does queueSize, by checking whether a |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
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diff
changeset
|
754 |
* near-empty queue has at least one unclaimed task. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
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changeset
|
755 |
*/ |
69bfd88e3ea1
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dl
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diff
changeset
|
756 |
final boolean isEmpty() { |
39723
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diff
changeset
|
757 |
ForkJoinTask<?>[] a; int n, al, b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
758 |
return ((n = (b = base) - top) >= 0 || // possibly one task |
32988 | 759 |
(n == -1 && ((a = array) == null || |
760 |
(al = a.length) == 0 || |
|
39723
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8157523: Various improvements to ForkJoin/SubmissionPublisher code
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diff
changeset
|
761 |
a[(al - 1) & b] == null))); |
14914
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diff
changeset
|
762 |
} |
69bfd88e3ea1
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diff
changeset
|
763 |
|
39723
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8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
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diff
changeset
|
764 |
|
14914
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changeset
|
765 |
/** |
32988 | 766 |
* Pushes a task. Call only by owner in unshared queues. |
14914
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changeset
|
767 |
* |
69bfd88e3ea1
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changeset
|
768 |
* @param task the task. Caller must ensure non-null. |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
769 |
* @throws RejectedExecutionException if array cannot be resized |
14914
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changeset
|
770 |
*/ |
69bfd88e3ea1
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diff
changeset
|
771 |
final void push(ForkJoinTask<?> task) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
772 |
int s = top; ForkJoinTask<?>[] a; int al, d; |
32988 | 773 |
if ((a = array) != null && (al = a.length) > 0) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
774 |
int index = (al - 1) & s; |
32988 | 775 |
ForkJoinPool p = pool; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
776 |
top = s + 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
777 |
QA.setRelease(a, index, task); |
32988 | 778 |
if ((d = base - s) == 0 && p != null) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
779 |
VarHandle.fullFence(); |
32988 | 780 |
p.signalWork(); |
26448 | 781 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
782 |
else if (d + al == 1) |
14914
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diff
changeset
|
783 |
growArray(); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
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diff
changeset
|
784 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
785 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
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diff
changeset
|
786 |
|
18790 | 787 |
/** |
14914
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diff
changeset
|
788 |
* Initializes or doubles the capacity of array. Call either |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
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diff
changeset
|
789 |
* by owner or with lock held -- it is OK for base, but not |
69bfd88e3ea1
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parents:
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diff
changeset
|
790 |
* top, to move while resizings are in progress. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
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diff
changeset
|
791 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
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11279
diff
changeset
|
792 |
final ForkJoinTask<?>[] growArray() { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
793 |
ForkJoinTask<?>[] oldA = array; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
794 |
int oldSize = oldA != null ? oldA.length : 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
795 |
int size = oldSize > 0 ? oldSize << 1 : INITIAL_QUEUE_CAPACITY; |
32988 | 796 |
if (size < INITIAL_QUEUE_CAPACITY || size > MAXIMUM_QUEUE_CAPACITY) |
14914
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diff
changeset
|
797 |
throw new RejectedExecutionException("Queue capacity exceeded"); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
798 |
int oldMask, t, b; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
799 |
ForkJoinTask<?>[] a = array = new ForkJoinTask<?>[size]; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
800 |
if (oldA != null && (oldMask = oldSize - 1) > 0 && |
14914
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dl
parents:
11279
diff
changeset
|
801 |
(t = top) - (b = base) > 0) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
802 |
int mask = size - 1; |
26448 | 803 |
do { // emulate poll from old array, push to new array |
32988 | 804 |
int index = b & oldMask; |
805 |
ForkJoinTask<?> x = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
806 |
QA.getAcquire(oldA, index); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
807 |
if (x != null && |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
808 |
QA.compareAndSet(oldA, index, x, null)) |
32988 | 809 |
a[b & mask] = x; |
14914
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11279
diff
changeset
|
810 |
} while (++b != t); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
811 |
VarHandle.releaseFence(); |
14914
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dl
parents:
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diff
changeset
|
812 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
813 |
return a; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
814 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
815 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
816 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
817 |
* Takes next task, if one exists, in LIFO order. Call only |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
818 |
* by owner in unshared queues. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
819 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
820 |
final ForkJoinTask<?> pop() { |
32988 | 821 |
int b = base, s = top, al, i; ForkJoinTask<?>[] a; |
822 |
if ((a = array) != null && b != s && (al = a.length) > 0) { |
|
823 |
int index = (al - 1) & --s; |
|
824 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
825 |
QA.get(a, index); |
32988 | 826 |
if (t != null && |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
827 |
QA.compareAndSet(a, index, t, null)) { |
32988 | 828 |
top = s; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
829 |
VarHandle.releaseFence(); |
14914
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8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
830 |
return t; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
831 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
832 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
833 |
return null; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
834 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
835 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
836 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
837 |
* Takes next task, if one exists, in FIFO order. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
838 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
839 |
final ForkJoinTask<?> poll() { |
32988 | 840 |
for (;;) { |
841 |
int b = base, s = top, d, al; ForkJoinTask<?>[] a; |
|
842 |
if ((a = array) != null && (d = b - s) < 0 && |
|
843 |
(al = a.length) > 0) { |
|
844 |
int index = (al - 1) & b; |
|
845 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
846 |
QA.getAcquire(a, index); |
32988 | 847 |
if (b++ == base) { |
848 |
if (t != null) { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
849 |
if (QA.compareAndSet(a, index, t, null)) { |
32988 | 850 |
base = b; |
851 |
return t; |
|
852 |
} |
|
26448 | 853 |
} |
32988 | 854 |
else if (d == -1) |
855 |
break; // now empty |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
856 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
857 |
} |
32988 | 858 |
else |
859 |
break; |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
860 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
861 |
return null; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
862 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
863 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
864 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
865 |
* Takes next task, if one exists, in order specified by mode. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
866 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
867 |
final ForkJoinTask<?> nextLocalTask() { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
868 |
return ((id & FIFO) != 0) ? poll() : pop(); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
869 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
870 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
871 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
872 |
* Returns next task, if one exists, in order specified by mode. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
873 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
874 |
final ForkJoinTask<?> peek() { |
32988 | 875 |
int al; ForkJoinTask<?>[] a; |
876 |
return ((a = array) != null && (al = a.length) > 0) ? |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
877 |
a[(al - 1) & |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
878 |
((id & FIFO) != 0 ? base : top - 1)] : null; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
879 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
880 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
881 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
882 |
* Pops the given task only if it is at the current top. |
32988 | 883 |
*/ |
884 |
final boolean tryUnpush(ForkJoinTask<?> task) { |
|
885 |
int b = base, s = top, al; ForkJoinTask<?>[] a; |
|
886 |
if ((a = array) != null && b != s && (al = a.length) > 0) { |
|
887 |
int index = (al - 1) & --s; |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
888 |
if (QA.compareAndSet(a, index, task, null)) { |
32988 | 889 |
top = s; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
890 |
VarHandle.releaseFence(); |
32988 | 891 |
return true; |
892 |
} |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
893 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
894 |
return false; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
895 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
896 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
897 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
898 |
* Removes and cancels all known tasks, ignoring any exceptions. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
899 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
900 |
final void cancelAll() { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
901 |
for (ForkJoinTask<?> t; (t = poll()) != null; ) |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
902 |
ForkJoinTask.cancelIgnoringExceptions(t); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
903 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
904 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
905 |
// Specialized execution methods |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
906 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
907 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
908 |
* Pops and executes up to limit consecutive tasks or until empty. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
909 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
910 |
* @param limit max runs, or zero for no limit |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
911 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
912 |
final void localPopAndExec(int limit) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
913 |
for (;;) { |
32988 | 914 |
int b = base, s = top, al; ForkJoinTask<?>[] a; |
915 |
if ((a = array) != null && b != s && (al = a.length) > 0) { |
|
916 |
int index = (al - 1) & --s; |
|
917 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
918 |
QA.getAndSet(a, index, null); |
32988 | 919 |
if (t != null) { |
920 |
top = s; |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
921 |
VarHandle.releaseFence(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
922 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
923 |
if (limit != 0 && --limit == 0) |
32988 | 924 |
break; |
925 |
} |
|
926 |
else |
|
927 |
break; |
|
928 |
} |
|
929 |
else |
|
930 |
break; |
|
931 |
} |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
932 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
933 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
934 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
935 |
* Polls and executes up to limit consecutive tasks or until empty. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
936 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
937 |
* @param limit, or zero for no limit |
26448 | 938 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
939 |
final void localPollAndExec(int limit) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
940 |
for (int polls = 0;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
941 |
int b = base, s = top, d, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
942 |
if ((a = array) != null && (d = b - s) < 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
943 |
(al = a.length) > 0) { |
32988 | 944 |
int index = (al - 1) & b++; |
945 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
946 |
QA.getAndSet(a, index, null); |
32988 | 947 |
if (t != null) { |
948 |
base = b; |
|
26448 | 949 |
t.doExec(); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
950 |
if (limit != 0 && ++polls == limit) |
26448 | 951 |
break; |
952 |
} |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
953 |
else if (d == -1) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
954 |
break; // now empty |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
955 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
956 |
polls = 0; // stolen; reset |
26448 | 957 |
} |
958 |
else |
|
32988 | 959 |
break; |
26448 | 960 |
} |
961 |
} |
|
962 |
||
963 |
/** |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
964 |
* If present, removes task from queue and executes it. |
18790 | 965 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
966 |
final void tryRemoveAndExec(ForkJoinTask<?> task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
967 |
ForkJoinTask<?>[] wa; int s, wal; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
968 |
if (base - (s = top) < 0 && // traverse from top |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
969 |
(wa = array) != null && (wal = wa.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
970 |
for (int m = wal - 1, ns = s - 1, i = ns; ; --i) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
971 |
int index = i & m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
972 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
973 |
QA.get(wa, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
974 |
if (t == null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
975 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
976 |
else if (t == task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
977 |
if (QA.compareAndSet(wa, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
978 |
top = ns; // safely shift down |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
979 |
for (int j = i; j != ns; ++j) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
980 |
ForkJoinTask<?> f; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
981 |
int pindex = (j + 1) & m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
982 |
f = (ForkJoinTask<?>)QA.get(wa, pindex); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
983 |
QA.setVolatile(wa, pindex, null); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
984 |
int jindex = j & m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
985 |
QA.setRelease(wa, jindex, f); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
986 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
987 |
VarHandle.releaseFence(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
988 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
989 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
990 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
991 |
} |
32988 | 992 |
} |
26448 | 993 |
} |
994 |
} |
|
995 |
||
996 |
/** |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
997 |
* Tries to steal and run tasks within the target's |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
998 |
* computation until done, not found, or limit exceeded. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
999 |
* |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1000 |
* @param task root of CountedCompleter computation |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1001 |
* @param limit max runs, or zero for no limit |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1002 |
* @return task status on exit |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1003 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1004 |
final int localHelpCC(CountedCompleter<?> task, int limit) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1005 |
int status = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1006 |
if (task != null && (status = task.status) >= 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1007 |
for (;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1008 |
boolean help = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1009 |
int b = base, s = top, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1010 |
if ((a = array) != null && b != s && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1011 |
int index = (al - 1) & (s - 1); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1012 |
ForkJoinTask<?> o = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1013 |
QA.get(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1014 |
if (o instanceof CountedCompleter) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1015 |
CountedCompleter<?> t = (CountedCompleter<?>)o; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1016 |
for (CountedCompleter<?> f = t;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1017 |
if (f != task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1018 |
if ((f = f.completer) == null) // try parent |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1019 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1020 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1021 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1022 |
if (QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1023 |
top = s - 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1024 |
VarHandle.releaseFence(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1025 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1026 |
help = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1027 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1028 |
break; |
26448 | 1029 |
} |
1030 |
} |
|
32988 | 1031 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1032 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1033 |
if ((status = task.status) < 0 || !help || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1034 |
(limit != 0 && --limit == 0)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1035 |
break; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1036 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1037 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1038 |
return status; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1039 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1040 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1041 |
// Operations on shared queues |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1042 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1043 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1044 |
* Tries to lock shared queue by CASing phase field. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1045 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1046 |
final boolean tryLockSharedQueue() { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1047 |
return PHASE.compareAndSet(this, 0, QLOCK); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1048 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1049 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1050 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1051 |
* Shared version of tryUnpush. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1052 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1053 |
final boolean trySharedUnpush(ForkJoinTask<?> task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1054 |
boolean popped = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1055 |
int s = top - 1, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1056 |
if ((a = array) != null && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1057 |
int index = (al - 1) & s; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1058 |
ForkJoinTask<?> t = (ForkJoinTask<?>) QA.get(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1059 |
if (t == task && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1060 |
PHASE.compareAndSet(this, 0, QLOCK)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1061 |
if (top == s + 1 && array == a && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1062 |
QA.compareAndSet(a, index, task, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1063 |
popped = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1064 |
top = s; |
18790 | 1065 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1066 |
PHASE.setRelease(this, 0); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1067 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1068 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1069 |
return popped; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1070 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1071 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1072 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1073 |
* Shared version of localHelpCC. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1074 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1075 |
final int sharedHelpCC(CountedCompleter<?> task, int limit) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1076 |
int status = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1077 |
if (task != null && (status = task.status) >= 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1078 |
for (;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1079 |
boolean help = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1080 |
int b = base, s = top, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1081 |
if ((a = array) != null && b != s && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1082 |
int index = (al - 1) & (s - 1); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1083 |
ForkJoinTask<?> o = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1084 |
QA.get(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1085 |
if (o instanceof CountedCompleter) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1086 |
CountedCompleter<?> t = (CountedCompleter<?>)o; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1087 |
for (CountedCompleter<?> f = t;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1088 |
if (f != task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1089 |
if ((f = f.completer) == null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1090 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1091 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1092 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1093 |
if (PHASE.compareAndSet(this, 0, QLOCK)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1094 |
if (top == s && array == a && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1095 |
QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1096 |
help = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1097 |
top = s - 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1098 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1099 |
PHASE.setRelease(this, 0); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1100 |
if (help) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1101 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1102 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1103 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1104 |
} |
18790 | 1105 |
} |
26448 | 1106 |
} |
18790 | 1107 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1108 |
if ((status = task.status) < 0 || !help || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1109 |
(limit != 0 && --limit == 0)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1110 |
break; |
18790 | 1111 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1112 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1113 |
return status; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1114 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1115 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1116 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1117 |
* Returns true if owned and not known to be blocked. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1118 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1119 |
final boolean isApparentlyUnblocked() { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1120 |
Thread wt; Thread.State s; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1121 |
return ((wt = owner) != null && |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1122 |
(s = wt.getState()) != Thread.State.BLOCKED && |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1123 |
s != Thread.State.WAITING && |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1124 |
s != Thread.State.TIMED_WAITING); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1125 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1126 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1127 |
// VarHandle mechanics. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1128 |
private static final VarHandle PHASE; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1129 |
static { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1130 |
try { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1131 |
MethodHandles.Lookup l = MethodHandles.lookup(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1132 |
PHASE = l.findVarHandle(WorkQueue.class, "phase", int.class); |
32988 | 1133 |
} catch (ReflectiveOperationException e) { |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1134 |
throw new Error(e); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1135 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1136 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1137 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1138 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1139 |
// static fields (initialized in static initializer below) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1140 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1141 |
/** |
4110 | 1142 |
* Creates a new ForkJoinWorkerThread. This factory is used unless |
1143 |
* overridden in ForkJoinPool constructors. |
|
1144 |
*/ |
|
1145 |
public static final ForkJoinWorkerThreadFactory |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1146 |
defaultForkJoinWorkerThreadFactory; |
4110 | 1147 |
|
1148 |
/** |
|
1149 |
* Permission required for callers of methods that may start or |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1150 |
* kill threads. |
4110 | 1151 |
*/ |
32988 | 1152 |
static final RuntimePermission modifyThreadPermission; |
4110 | 1153 |
|
1154 |
/** |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1155 |
* Common (static) pool. Non-null for public use unless a static |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1156 |
* construction exception, but internal usages null-check on use |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1157 |
* to paranoically avoid potential initialization circularities |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1158 |
* as well as to simplify generated code. |
4110 | 1159 |
*/ |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1160 |
static final ForkJoinPool common; |
4110 | 1161 |
|
1162 |
/** |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1163 |
* Common pool parallelism. To allow simpler use and management |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1164 |
* when common pool threads are disabled, we allow the underlying |
18790 | 1165 |
* common.parallelism field to be zero, but in that case still report |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1166 |
* parallelism as 1 to reflect resulting caller-runs mechanics. |
4110 | 1167 |
*/ |
32988 | 1168 |
static final int COMMON_PARALLELISM; |
4110 | 1169 |
|
1170 |
/** |
|
26448 | 1171 |
* Limit on spare thread construction in tryCompensate. |
1172 |
*/ |
|
32988 | 1173 |
private static final int COMMON_MAX_SPARES; |
26448 | 1174 |
|
1175 |
/** |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1176 |
* Sequence number for creating workerNamePrefix. |
4110 | 1177 |
*/ |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1178 |
private static int poolNumberSequence; |
4110 | 1179 |
|
1180 |
/** |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1181 |
* Returns the next sequence number. We don't expect this to |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1182 |
* ever contend, so use simple builtin sync. |
4110 | 1183 |
*/ |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1184 |
private static final synchronized int nextPoolId() { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1185 |
return ++poolNumberSequence; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1186 |
} |
4110 | 1187 |
|
26448 | 1188 |
// static configuration constants |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1189 |
|
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1190 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1191 |
* Default idle timeout value (in milliseconds) for the thread |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1192 |
* triggering quiescence to park waiting for new work |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1193 |
*/ |
41131
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
1194 |
private static final long DEFAULT_KEEPALIVE = 60_000L; |
6543 | 1195 |
|
1196 |
/** |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1197 |
* Undershoot tolerance for idle timeouts |
6543 | 1198 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1199 |
private static final long TIMEOUT_SLOP = 20L; |
26448 | 1200 |
|
1201 |
/** |
|
32988 | 1202 |
* The default value for COMMON_MAX_SPARES. Overridable using the |
1203 |
* "java.util.concurrent.ForkJoinPool.common.maximumSpares" system |
|
1204 |
* property. The default value is far in excess of normal |
|
1205 |
* requirements, but also far short of MAX_CAP and typical OS |
|
1206 |
* thread limits, so allows JVMs to catch misuse/abuse before |
|
1207 |
* running out of resources needed to do so. |
|
26448 | 1208 |
*/ |
32988 | 1209 |
private static final int DEFAULT_COMMON_MAX_SPARES = 256; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1210 |
|
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1211 |
/** |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1212 |
* Increment for seed generators. See class ThreadLocal for |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1213 |
* explanation. |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1214 |
*/ |
22070 | 1215 |
private static final int SEED_INCREMENT = 0x9e3779b9; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1216 |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1217 |
/* |
26448 | 1218 |
* Bits and masks for field ctl, packed with 4 16 bit subfields: |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1219 |
* RC: Number of released (unqueued) workers minus target parallelism |
26448 | 1220 |
* TC: Number of total workers minus target parallelism |
1221 |
* SS: version count and status of top waiting thread |
|
1222 |
* ID: poolIndex of top of Treiber stack of waiters |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1223 |
* |
26448 | 1224 |
* When convenient, we can extract the lower 32 stack top bits |
1225 |
* (including version bits) as sp=(int)ctl. The offsets of counts |
|
1226 |
* by the target parallelism and the positionings of fields makes |
|
1227 |
* it possible to perform the most common checks via sign tests of |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1228 |
* fields: When ac is negative, there are not enough unqueued |
26448 | 1229 |
* workers, when tc is negative, there are not enough total |
1230 |
* workers. When sp is non-zero, there are waiting workers. To |
|
1231 |
* deal with possibly negative fields, we use casts in and out of |
|
1232 |
* "short" and/or signed shifts to maintain signedness. |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1233 |
* |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1234 |
* Because it occupies uppermost bits, we can add one release count |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1235 |
* using getAndAddLong of RC_UNIT, rather than CAS, when returning |
26448 | 1236 |
* from a blocked join. Other updates entail multiple subfields |
1237 |
* and masking, requiring CAS. |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1238 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1239 |
* The limits packed in field "bounds" are also offset by the |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1240 |
* parallelism level to make them comparable to the ctl rc and tc |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1241 |
* fields. |
6543 | 1242 |
*/ |
4110 | 1243 |
|
26448 | 1244 |
// Lower and upper word masks |
1245 |
private static final long SP_MASK = 0xffffffffL; |
|
1246 |
private static final long UC_MASK = ~SP_MASK; |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1247 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1248 |
// Release counts |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1249 |
private static final int RC_SHIFT = 48; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1250 |
private static final long RC_UNIT = 0x0001L << RC_SHIFT; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1251 |
private static final long RC_MASK = 0xffffL << RC_SHIFT; |
6543 | 1252 |
|
26448 | 1253 |
// Total counts |
1254 |
private static final int TC_SHIFT = 32; |
|
1255 |
private static final long TC_UNIT = 0x0001L << TC_SHIFT; |
|
1256 |
private static final long TC_MASK = 0xffffL << TC_SHIFT; |
|
1257 |
private static final long ADD_WORKER = 0x0001L << (TC_SHIFT + 15); // sign |
|
6543 | 1258 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1259 |
// Instance fields |
6543 | 1260 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1261 |
volatile long stealCount; // collects worker nsteals |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1262 |
final long keepAlive; // milliseconds before dropping if idle |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1263 |
int indexSeed; // next worker index |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1264 |
final int bounds; // min, max threads packed as shorts |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1265 |
volatile int mode; // parallelism, runstate, queue mode |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1266 |
WorkQueue[] workQueues; // main registry |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1267 |
final String workerNamePrefix; // for worker thread string; sync lock |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1268 |
final ForkJoinWorkerThreadFactory factory; |
26448 | 1269 |
final UncaughtExceptionHandler ueh; // per-worker UEH |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1270 |
final Predicate<? super ForkJoinPool> saturate; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1271 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1272 |
@jdk.internal.vm.annotation.Contended("fjpctl") // segregate |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1273 |
volatile long ctl; // main pool control |
26448 | 1274 |
|
1275 |
// Creating, registering and deregistering workers |
|
1276 |
||
1277 |
/** |
|
1278 |
* Tries to construct and start one worker. Assumes that total |
|
1279 |
* count has already been incremented as a reservation. Invokes |
|
1280 |
* deregisterWorker on any failure. |
|
1281 |
* |
|
1282 |
* @return true if successful |
|
1283 |
*/ |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1284 |
private boolean createWorker() { |
26448 | 1285 |
ForkJoinWorkerThreadFactory fac = factory; |
1286 |
Throwable ex = null; |
|
1287 |
ForkJoinWorkerThread wt = null; |
|
1288 |
try { |
|
1289 |
if (fac != null && (wt = fac.newThread(this)) != null) { |
|
1290 |
wt.start(); |
|
1291 |
return true; |
|
1292 |
} |
|
1293 |
} catch (Throwable rex) { |
|
1294 |
ex = rex; |
|
1295 |
} |
|
1296 |
deregisterWorker(wt, ex); |
|
1297 |
return false; |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1298 |
} |
4110 | 1299 |
|
1300 |
/** |
|
26448 | 1301 |
* Tries to add one worker, incrementing ctl counts before doing |
1302 |
* so, relying on createWorker to back out on failure. |
|
1303 |
* |
|
1304 |
* @param c incoming ctl value, with total count negative and no |
|
1305 |
* idle workers. On CAS failure, c is refreshed and retried if |
|
1306 |
* this holds (otherwise, a new worker is not needed). |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1307 |
*/ |
26448 | 1308 |
private void tryAddWorker(long c) { |
1309 |
do { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1310 |
long nc = ((RC_MASK & (c + RC_UNIT)) | |
26448 | 1311 |
(TC_MASK & (c + TC_UNIT))); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1312 |
if (ctl == c && CTL.compareAndSet(this, c, nc)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1313 |
createWorker(); |
32988 | 1314 |
break; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1315 |
} |
26448 | 1316 |
} while (((c = ctl) & ADD_WORKER) != 0L && (int)c == 0); |
4110 | 1317 |
} |
1318 |
||
1319 |
/** |
|
26448 | 1320 |
* Callback from ForkJoinWorkerThread constructor to establish and |
1321 |
* record its WorkQueue. |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1322 |
* |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1323 |
* @param wt the worker thread |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1324 |
* @return the worker's queue |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1325 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1326 |
final WorkQueue registerWorker(ForkJoinWorkerThread wt) { |
26448 | 1327 |
UncaughtExceptionHandler handler; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1328 |
wt.setDaemon(true); // configure thread |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1329 |
if ((handler = ueh) != null) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1330 |
wt.setUncaughtExceptionHandler(handler); |
26448 | 1331 |
WorkQueue w = new WorkQueue(this, wt); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1332 |
int tid = 0; // for thread name |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1333 |
int fifo = mode & FIFO; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1334 |
String prefix = workerNamePrefix; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1335 |
if (prefix != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1336 |
synchronized (prefix) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1337 |
WorkQueue[] ws = workQueues; int n; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1338 |
int s = indexSeed += SEED_INCREMENT; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1339 |
if (ws != null && (n = ws.length) > 1) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1340 |
int m = n - 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1341 |
tid = s & m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1342 |
int i = m & ((s << 1) | 1); // odd-numbered indices |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1343 |
for (int probes = n >>> 1;;) { // find empty slot |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1344 |
WorkQueue q; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1345 |
if ((q = ws[i]) == null || q.phase == QUIET) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1346 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1347 |
else if (--probes == 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1348 |
i = n | 1; // resize below |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1349 |
break; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1350 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1351 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1352 |
i = (i + 2) & m; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1353 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1354 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1355 |
int id = i | fifo | (s & ~(SMASK | FIFO | DORMANT)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1356 |
w.phase = w.id = id; // now publishable |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1357 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1358 |
if (i < n) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1359 |
ws[i] = w; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1360 |
else { // expand array |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1361 |
int an = n << 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1362 |
WorkQueue[] as = new WorkQueue[an]; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1363 |
as[i] = w; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1364 |
int am = an - 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1365 |
for (int j = 0; j < n; ++j) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1366 |
WorkQueue v; // copy external queue |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1367 |
if ((v = ws[j]) != null) // position may change |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1368 |
as[v.id & am & SQMASK] = v; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1369 |
if (++j >= n) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1370 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1371 |
as[j] = ws[j]; // copy worker |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1372 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1373 |
workQueues = as; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1374 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1375 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1376 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1377 |
wt.setName(prefix.concat(Integer.toString(tid))); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1378 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1379 |
return w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1380 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1381 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1382 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1383 |
* Final callback from terminating worker, as well as upon failure |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1384 |
* to construct or start a worker. Removes record of worker from |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1385 |
* array, and adjusts counts. If pool is shutting down, tries to |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1386 |
* complete termination. |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1387 |
* |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
1388 |
* @param wt the worker thread, or null if construction failed |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1389 |
* @param ex the exception causing failure, or null if none |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1390 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1391 |
final void deregisterWorker(ForkJoinWorkerThread wt, Throwable ex) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1392 |
WorkQueue w = null; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1393 |
int phase = 0; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1394 |
if (wt != null && (w = wt.workQueue) != null) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1395 |
Object lock = workerNamePrefix; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1396 |
long ns = (long)w.nsteals & 0xffffffffL; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1397 |
int idx = w.id & SMASK; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1398 |
if (lock != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1399 |
WorkQueue[] ws; // remove index from array |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1400 |
synchronized (lock) { |
32988 | 1401 |
if ((ws = workQueues) != null && ws.length > idx && |
1402 |
ws[idx] == w) |
|
1403 |
ws[idx] = null; |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1404 |
stealCount += ns; |
32988 | 1405 |
} |
1406 |
} |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1407 |
phase = w.phase; |
26448 | 1408 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1409 |
if (phase != QUIET) { // else pre-adjusted |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1410 |
long c; // decrement counts |
40734
48879ea67e2a
8162108: Rename weakCompareAndSetVolatile to weakCompareAndSet
psandoz
parents:
39723
diff
changeset
|
1411 |
do {} while (!CTL.weakCompareAndSet |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1412 |
(this, c = ctl, ((RC_MASK & (c - RC_UNIT)) | |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1413 |
(TC_MASK & (c - TC_UNIT)) | |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1414 |
(SP_MASK & c)))); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1415 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1416 |
if (w != null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1417 |
w.cancelAll(); // cancel remaining tasks |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1418 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1419 |
if (!tryTerminate(false, false) && // possibly replace worker |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1420 |
w != null && w.array != null) // avoid repeated failures |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1421 |
signalWork(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1422 |
|
26448 | 1423 |
if (ex == null) // help clean on way out |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1424 |
ForkJoinTask.helpExpungeStaleExceptions(); |
26448 | 1425 |
else // rethrow |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1426 |
ForkJoinTask.rethrow(ex); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1427 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1428 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1429 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1430 |
* Tries to create or release a worker if too few are running. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1431 |
*/ |
32988 | 1432 |
final void signalWork() { |
1433 |
for (;;) { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1434 |
long c; int sp; WorkQueue[] ws; int i; WorkQueue v; |
32988 | 1435 |
if ((c = ctl) >= 0L) // enough workers |
1436 |
break; |
|
1437 |
else if ((sp = (int)c) == 0) { // no idle workers |
|
1438 |
if ((c & ADD_WORKER) != 0L) // too few workers |
|
26448 | 1439 |
tryAddWorker(c); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1440 |
break; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1441 |
} |
32988 | 1442 |
else if ((ws = workQueues) == null) |
1443 |
break; // unstarted/terminated |
|
1444 |
else if (ws.length <= (i = sp & SMASK)) |
|
1445 |
break; // terminated |
|
1446 |
else if ((v = ws[i]) == null) |
|
1447 |
break; // terminating |
|
1448 |
else { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1449 |
int np = sp & ~UNSIGNALLED; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1450 |
int vp = v.phase; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1451 |
long nc = (v.stackPred & SP_MASK) | (UC_MASK & (c + RC_UNIT)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1452 |
Thread vt = v.owner; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1453 |
if (sp == vp && CTL.compareAndSet(this, c, nc)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1454 |
v.phase = np; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1455 |
if (v.source < 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1456 |
LockSupport.unpark(vt); |
32988 | 1457 |
break; |
1458 |
} |
|
18790 | 1459 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1460 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1461 |
} |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1462 |
|
26448 | 1463 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1464 |
* Tries to decrement counts (sometimes implicitly) and possibly |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1465 |
* arrange for a compensating worker in preparation for blocking: |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1466 |
* If not all core workers yet exist, creates one, else if any are |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1467 |
* unreleased (possibly including caller) releases one, else if |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1468 |
* fewer than the minimum allowed number of workers running, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1469 |
* checks to see that they are all active, and if so creates an |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1470 |
* extra worker unless over maximum limit and policy is to |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1471 |
* saturate. Most of these steps can fail due to interference, in |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1472 |
* which case 0 is returned so caller will retry. A negative |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1473 |
* return value indicates that the caller doesn't need to |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1474 |
* re-adjust counts when later unblocked. |
26448 | 1475 |
* |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1476 |
* @return 1: block then adjust, -1: block without adjust, 0 : retry |
32988 | 1477 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1478 |
private int tryCompensate(WorkQueue w) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1479 |
int t, n, sp; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1480 |
long c = ctl; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1481 |
WorkQueue[] ws = workQueues; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1482 |
if ((t = (short)(c >>> TC_SHIFT)) >= 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1483 |
if (ws == null || (n = ws.length) <= 0 || w == null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1484 |
return 0; // disabled |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1485 |
else if ((sp = (int)c) != 0) { // replace or release |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1486 |
WorkQueue v = ws[sp & (n - 1)]; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1487 |
int wp = w.phase; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1488 |
long uc = UC_MASK & ((wp < 0) ? c + RC_UNIT : c); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1489 |
int np = sp & ~UNSIGNALLED; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1490 |
if (v != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1491 |
int vp = v.phase; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1492 |
Thread vt = v.owner; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1493 |
long nc = ((long)v.stackPred & SP_MASK) | uc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1494 |
if (vp == sp && CTL.compareAndSet(this, c, nc)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1495 |
v.phase = np; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1496 |
if (v.source < 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1497 |
LockSupport.unpark(vt); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1498 |
return (wp < 0) ? -1 : 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1499 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1500 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1501 |
return 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1502 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1503 |
else if ((int)(c >> RC_SHIFT) - // reduce parallelism |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1504 |
(short)(bounds & SMASK) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1505 |
long nc = ((RC_MASK & (c - RC_UNIT)) | (~RC_MASK & c)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1506 |
return CTL.compareAndSet(this, c, nc) ? 1 : 0; |
32988 | 1507 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1508 |
else { // validate |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1509 |
int md = mode, pc = md & SMASK, tc = pc + t, bc = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1510 |
boolean unstable = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1511 |
for (int i = 1; i < n; i += 2) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1512 |
WorkQueue q; Thread wt; Thread.State ts; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1513 |
if ((q = ws[i]) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1514 |
if (q.source == 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1515 |
unstable = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1516 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1517 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1518 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1519 |
--tc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1520 |
if ((wt = q.owner) != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1521 |
((ts = wt.getState()) == Thread.State.BLOCKED || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1522 |
ts == Thread.State.WAITING)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1523 |
++bc; // worker is blocking |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1524 |
} |
32988 | 1525 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1526 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1527 |
if (unstable || tc != 0 || ctl != c) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1528 |
return 0; // inconsistent |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1529 |
else if (t + pc >= MAX_CAP || t >= (bounds >>> SWIDTH)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1530 |
Predicate<? super ForkJoinPool> sat; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1531 |
if ((sat = saturate) != null && sat.test(this)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1532 |
return -1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1533 |
else if (bc < pc) { // lagging |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1534 |
Thread.yield(); // for retry spins |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1535 |
return 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1536 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1537 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1538 |
throw new RejectedExecutionException( |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1539 |
"Thread limit exceeded replacing blocked worker"); |
32988 | 1540 |
} |
1541 |
} |
|
1542 |
} |
|
1543 |
||
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1544 |
long nc = ((c + TC_UNIT) & TC_MASK) | (c & ~TC_MASK); // expand pool |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1545 |
return CTL.compareAndSet(this, c, nc) && createWorker() ? 1 : 0; |
32988 | 1546 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1547 |
|
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1548 |
/** |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1549 |
* Top-level runloop for workers, called by ForkJoinWorkerThread.run. |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1550 |
* See above for explanation. |
7976
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
1551 |
*/ |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1552 |
final void runWorker(WorkQueue w) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1553 |
WorkQueue[] ws; |
32988 | 1554 |
w.growArray(); // allocate queue |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1555 |
int r = w.id ^ ThreadLocalRandom.nextSecondarySeed(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1556 |
if (r == 0) // initial nonzero seed |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1557 |
r = 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1558 |
int lastSignalId = 0; // avoid unneeded signals |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1559 |
while ((ws = workQueues) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1560 |
boolean nonempty = false; // scan |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1561 |
for (int n = ws.length, j = n, m = n - 1; j > 0; --j) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1562 |
WorkQueue q; int i, b, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1563 |
if ((i = r & m) >= 0 && i < n && // always true |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1564 |
(q = ws[i]) != null && (b = q.base) - q.top < 0 && |
32988 | 1565 |
(a = q.array) != null && (al = a.length) > 0) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1566 |
int qid = q.id; // (never zero) |
32988 | 1567 |
int index = (al - 1) & b; |
1568 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1569 |
QA.getAcquire(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1570 |
if (t != null && b++ == q.base && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1571 |
QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1572 |
if ((q.base = b) - q.top < 0 && qid != lastSignalId) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1573 |
signalWork(); // propagate signal |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1574 |
w.source = lastSignalId = qid; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1575 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1576 |
if ((w.id & FIFO) != 0) // run remaining locals |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1577 |
w.localPollAndExec(POLL_LIMIT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1578 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1579 |
w.localPopAndExec(POLL_LIMIT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1580 |
ForkJoinWorkerThread thread = w.owner; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1581 |
++w.nsteals; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1582 |
w.source = 0; // now idle |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1583 |
if (thread != null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1584 |
thread.afterTopLevelExec(); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1585 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1586 |
nonempty = true; |
32988 | 1587 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1588 |
else if (nonempty) |
32988 | 1589 |
break; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1590 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1591 |
++r; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1592 |
} |
26448 | 1593 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1594 |
if (nonempty) { // move (xorshift) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1595 |
r ^= r << 13; r ^= r >>> 17; r ^= r << 5; |
18790 | 1596 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1597 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1598 |
int phase; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1599 |
lastSignalId = 0; // clear for next scan |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1600 |
if ((phase = w.phase) >= 0) { // enqueue |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1601 |
int np = w.phase = (phase + SS_SEQ) | UNSIGNALLED; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1602 |
long c, nc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1603 |
do { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1604 |
w.stackPred = (int)(c = ctl); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1605 |
nc = ((c - RC_UNIT) & UC_MASK) | (SP_MASK & np); |
40734
48879ea67e2a
8162108: Rename weakCompareAndSetVolatile to weakCompareAndSet
psandoz
parents:
39723
diff
changeset
|
1606 |
} while (!CTL.weakCompareAndSet(this, c, nc)); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1607 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1608 |
else { // already queued |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1609 |
int pred = w.stackPred; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1610 |
w.source = DORMANT; // enable signal |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1611 |
for (int steps = 0;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1612 |
int md, rc; long c; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1613 |
if (w.phase >= 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1614 |
w.source = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1615 |
break; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1616 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1617 |
else if ((md = mode) < 0) // shutting down |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1618 |
return; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1619 |
else if ((rc = ((md & SMASK) + // possibly quiescent |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1620 |
(int)((c = ctl) >> RC_SHIFT))) <= 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1621 |
(md & SHUTDOWN) != 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1622 |
tryTerminate(false, false)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1623 |
return; // help terminate |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1624 |
else if ((++steps & 1) == 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1625 |
Thread.interrupted(); // clear between parks |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1626 |
else if (rc <= 0 && pred != 0 && phase == (int)c) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1627 |
long d = keepAlive + System.currentTimeMillis(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1628 |
LockSupport.parkUntil(this, d); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1629 |
if (ctl == c && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1630 |
d - System.currentTimeMillis() <= TIMEOUT_SLOP) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1631 |
long nc = ((UC_MASK & (c - TC_UNIT)) | |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1632 |
(SP_MASK & pred)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1633 |
if (CTL.compareAndSet(this, c, nc)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1634 |
w.phase = QUIET; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1635 |
return; // drop on timeout |
32988 | 1636 |
} |
1637 |
} |
|
1638 |
} |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1639 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1640 |
LockSupport.park(this); |
6543 | 1641 |
} |
1642 |
} |
|
32988 | 1643 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1644 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1645 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1646 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1647 |
/** |
26448 | 1648 |
* Helps and/or blocks until the given task is done or timeout. |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1649 |
* First tries locally helping, then scans other queues for a task |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1650 |
* produced by one of w's stealers; compensating and blocking if |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1651 |
* none are found (rescanning if tryCompensate fails). |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1652 |
* |
26448 | 1653 |
* @param w caller |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1654 |
* @param task the task |
26448 | 1655 |
* @param deadline for timed waits, if nonzero |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1656 |
* @return task status on exit |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1657 |
*/ |
26448 | 1658 |
final int awaitJoin(WorkQueue w, ForkJoinTask<?> task, long deadline) { |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1659 |
int s = 0; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1660 |
if (w != null && task != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1661 |
(!(task instanceof CountedCompleter) || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1662 |
(s = w.localHelpCC((CountedCompleter<?>)task, 0)) >= 0)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1663 |
w.tryRemoveAndExec(task); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1664 |
int src = w.source, id = w.id; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1665 |
s = task.status; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1666 |
while (s >= 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1667 |
WorkQueue[] ws; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1668 |
boolean nonempty = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1669 |
int r = ThreadLocalRandom.nextSecondarySeed() | 1; // odd indices |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1670 |
if ((ws = workQueues) != null) { // scan for matching id |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1671 |
for (int n = ws.length, m = n - 1, j = -n; j < n; j += 2) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1672 |
WorkQueue q; int i, b, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1673 |
if ((i = (r + j) & m) >= 0 && i < n && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1674 |
(q = ws[i]) != null && q.source == id && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1675 |
(b = q.base) - q.top < 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1676 |
(a = q.array) != null && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1677 |
int qid = q.id; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1678 |
int index = (al - 1) & b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1679 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1680 |
QA.getAcquire(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1681 |
if (t != null && b++ == q.base && id == q.source && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1682 |
QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1683 |
q.base = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1684 |
w.source = qid; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1685 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1686 |
w.source = src; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1687 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1688 |
nonempty = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1689 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1690 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1691 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1692 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1693 |
if ((s = task.status) < 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1694 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1695 |
else if (!nonempty) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1696 |
long ms, ns; int block; |
32988 | 1697 |
if (deadline == 0L) |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1698 |
ms = 0L; // untimed |
32988 | 1699 |
else if ((ns = deadline - System.nanoTime()) <= 0L) |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1700 |
break; // timeout |
32988 | 1701 |
else if ((ms = TimeUnit.NANOSECONDS.toMillis(ns)) <= 0L) |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1702 |
ms = 1L; // avoid 0 for timed wait |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1703 |
if ((block = tryCompensate(w)) != 0) { |
32988 | 1704 |
task.internalWait(ms); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1705 |
CTL.getAndAdd(this, (block > 0) ? RC_UNIT : 0L); |
32988 | 1706 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1707 |
s = task.status; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1708 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1709 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1710 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1711 |
return s; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1712 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1713 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1714 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1715 |
* Runs tasks until {@code isQuiescent()}. Rather than blocking |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1716 |
* when tasks cannot be found, rescans until all others cannot |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1717 |
* find tasks either. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1718 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1719 |
final void helpQuiescePool(WorkQueue w) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1720 |
int prevSrc = w.source, fifo = w.id & FIFO; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1721 |
for (int source = prevSrc, released = -1;;) { // -1 until known |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1722 |
WorkQueue[] ws; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1723 |
if (fifo != 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1724 |
w.localPollAndExec(0); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1725 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1726 |
w.localPopAndExec(0); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1727 |
if (released == -1 && w.phase >= 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1728 |
released = 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1729 |
boolean quiet = true, empty = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1730 |
int r = ThreadLocalRandom.nextSecondarySeed(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1731 |
if ((ws = workQueues) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1732 |
for (int n = ws.length, j = n, m = n - 1; j > 0; --j) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1733 |
WorkQueue q; int i, b, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1734 |
if ((i = (r - j) & m) >= 0 && i < n && (q = ws[i]) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1735 |
if ((b = q.base) - q.top < 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1736 |
(a = q.array) != null && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1737 |
int qid = q.id; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1738 |
if (released == 0) { // increment |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1739 |
released = 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1740 |
CTL.getAndAdd(this, RC_UNIT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1741 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1742 |
int index = (al - 1) & b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1743 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1744 |
QA.getAcquire(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1745 |
if (t != null && b++ == q.base && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1746 |
QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1747 |
q.base = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1748 |
w.source = source = q.id; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1749 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1750 |
w.source = source = prevSrc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1751 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1752 |
quiet = empty = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1753 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1754 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1755 |
else if ((q.source & QUIET) == 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1756 |
quiet = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1757 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1758 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1759 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1760 |
if (quiet) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1761 |
if (released == 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1762 |
CTL.getAndAdd(this, RC_UNIT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1763 |
w.source = prevSrc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1764 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1765 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1766 |
else if (empty) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1767 |
if (source != QUIET) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1768 |
w.source = source = QUIET; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1769 |
if (released == 1) { // decrement |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1770 |
released = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1771 |
CTL.getAndAdd(this, RC_MASK & -RC_UNIT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1772 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1773 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1774 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1775 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1776 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1777 |
/** |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1778 |
* Scans for and returns a polled task, if available. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1779 |
* Used only for untracked polls. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1780 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1781 |
* @param submissionsOnly if true, only scan submission queues |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1782 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1783 |
private ForkJoinTask<?> pollScan(boolean submissionsOnly) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1784 |
WorkQueue[] ws; int n; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1785 |
rescan: while ((mode & STOP) == 0 && (ws = workQueues) != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1786 |
(n = ws.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1787 |
int m = n - 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1788 |
int r = ThreadLocalRandom.nextSecondarySeed(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1789 |
int h = r >>> 16; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1790 |
int origin, step; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1791 |
if (submissionsOnly) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1792 |
origin = (r & ~1) & m; // even indices and steps |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1793 |
step = (h & ~1) | 2; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1794 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1795 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1796 |
origin = r & m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1797 |
step = h | 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1798 |
} |
32988 | 1799 |
for (int k = origin, oldSum = 0, checkSum = 0;;) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1800 |
WorkQueue q; int b, al; ForkJoinTask<?>[] a; |
26448 | 1801 |
if ((q = ws[k]) != null) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1802 |
checkSum += b = q.base; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1803 |
if (b - q.top < 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1804 |
(a = q.array) != null && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1805 |
int index = (al - 1) & b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1806 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1807 |
QA.getAcquire(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1808 |
if (t != null && b++ == q.base && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1809 |
QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1810 |
q.base = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1811 |
return t; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1812 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1813 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1814 |
break; // restart |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1815 |
} |
26448 | 1816 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1817 |
if ((k = (k + step) & m) == origin) { |
26448 | 1818 |
if (oldSum == (oldSum = checkSum)) |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1819 |
break rescan; |
26448 | 1820 |
checkSum = 0; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1821 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1822 |
} |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1823 |
} |
26448 | 1824 |
return null; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1825 |
} |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1826 |
|
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
1827 |
/** |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1828 |
* Gets and removes a local or stolen task for the given worker. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1829 |
* |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1830 |
* @return a task, if available |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1831 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1832 |
final ForkJoinTask<?> nextTaskFor(WorkQueue w) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1833 |
ForkJoinTask<?> t; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1834 |
if (w != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1835 |
(t = (w.id & FIFO) != 0 ? w.poll() : w.pop()) != null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1836 |
return t; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1837 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1838 |
return pollScan(false); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1839 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1840 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1841 |
// External operations |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1842 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1843 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1844 |
* Adds the given task to a submission queue at submitter's |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1845 |
* current queue, creating one if null or contended. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1846 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1847 |
* @param task the task. Caller must ensure non-null. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1848 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1849 |
final void externalPush(ForkJoinTask<?> task) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1850 |
int r; // initialize caller's probe |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1851 |
if ((r = ThreadLocalRandom.getProbe()) == 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1852 |
ThreadLocalRandom.localInit(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1853 |
r = ThreadLocalRandom.getProbe(); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
1854 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1855 |
for (;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1856 |
int md = mode, n; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1857 |
WorkQueue[] ws = workQueues; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1858 |
if ((md & SHUTDOWN) != 0 || ws == null || (n = ws.length) <= 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1859 |
throw new RejectedExecutionException(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1860 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1861 |
WorkQueue q; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1862 |
boolean push = false, grow = false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1863 |
if ((q = ws[(n - 1) & r & SQMASK]) == null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1864 |
Object lock = workerNamePrefix; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1865 |
int qid = (r | QUIET) & ~(FIFO | OWNED); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1866 |
q = new WorkQueue(this, null); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1867 |
q.id = qid; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1868 |
q.source = QUIET; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1869 |
q.phase = QLOCK; // lock queue |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1870 |
if (lock != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1871 |
synchronized (lock) { // lock pool to install |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1872 |
int i; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1873 |
if ((ws = workQueues) != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1874 |
(n = ws.length) > 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1875 |
ws[i = qid & (n - 1) & SQMASK] == null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1876 |
ws[i] = q; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1877 |
push = grow = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1878 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1879 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1880 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1881 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1882 |
else if (q.tryLockSharedQueue()) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1883 |
int b = q.base, s = q.top, al, d; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1884 |
if ((a = q.array) != null && (al = a.length) > 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1885 |
al - 1 + (d = b - s) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1886 |
a[(al - 1) & s] = task; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1887 |
q.top = s + 1; // relaxed writes OK here |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1888 |
q.phase = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1889 |
if (d < 0 && q.base - s < -1) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1890 |
break; // no signal needed |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1891 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1892 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1893 |
grow = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1894 |
push = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1895 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1896 |
if (push) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1897 |
if (grow) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1898 |
try { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1899 |
q.growArray(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1900 |
int s = q.top, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1901 |
if ((a = q.array) != null && (al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1902 |
a[(al - 1) & s] = task; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1903 |
q.top = s + 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1904 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1905 |
} finally { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1906 |
q.phase = 0; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1907 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1908 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1909 |
signalWork(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1910 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1911 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1912 |
else // move if busy |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1913 |
r = ThreadLocalRandom.advanceProbe(r); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
1914 |
} |
9aa34e4a0469
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1915 |
} |
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1916 |
} |
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|
1917 |
|
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1918 |
/** |
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1919 |
* Pushes a possibly-external submission. |
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1920 |
*/ |
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|
1921 |
private <T> ForkJoinTask<T> externalSubmit(ForkJoinTask<T> task) { |
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1922 |
Thread t; ForkJoinWorkerThread w; WorkQueue q; |
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|
1923 |
if (task == null) |
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|
1924 |
throw new NullPointerException(); |
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|
1925 |
if (((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) && |
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1926 |
(w = (ForkJoinWorkerThread)t).pool == this && |
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1927 |
(q = w.workQueue) != null) |
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|
1928 |
q.push(task); |
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|
1929 |
else |
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|
1930 |
externalPush(task); |
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|
1931 |
return task; |
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|
1932 |
} |
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|
1933 |
|
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|
1934 |
/** |
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1935 |
* Returns common pool queue for an external thread. |
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|
1936 |
*/ |
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|
1937 |
static WorkQueue commonSubmitterQueue() { |
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|
1938 |
ForkJoinPool p = common; |
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|
1939 |
int r = ThreadLocalRandom.getProbe(); |
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|
1940 |
WorkQueue[] ws; int n; |
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|
1941 |
return (p != null && (ws = p.workQueues) != null && |
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|
1942 |
(n = ws.length) > 0) ? |
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1943 |
ws[(n - 1) & r & SQMASK] : null; |
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|
1944 |
} |
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|
1945 |
|
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|
1946 |
/** |
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|
1947 |
* Performs tryUnpush for an external submitter. |
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|
1948 |
*/ |
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|
1949 |
final boolean tryExternalUnpush(ForkJoinTask<?> task) { |
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|
1950 |
int r = ThreadLocalRandom.getProbe(); |
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|
1951 |
WorkQueue[] ws; WorkQueue w; int n; |
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|
1952 |
return ((ws = workQueues) != null && |
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|
1953 |
(n = ws.length) > 0 && |
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|
1954 |
(w = ws[(n - 1) & r & SQMASK]) != null && |
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|
1955 |
w.trySharedUnpush(task)); |
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|
1956 |
} |
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|
1957 |
|
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|
1958 |
/** |
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|
1959 |
* Performs helpComplete for an external submitter. |
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|
1960 |
*/ |
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|
1961 |
final int externalHelpComplete(CountedCompleter<?> task, int maxTasks) { |
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|
1962 |
int r = ThreadLocalRandom.getProbe(); |
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|
1963 |
WorkQueue[] ws; WorkQueue w; int n; |
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|
1964 |
return ((ws = workQueues) != null && (n = ws.length) > 0 && |
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|
1965 |
(w = ws[(n - 1) & r & SQMASK]) != null) ? |
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|
1966 |
w.sharedHelpCC(task, maxTasks) : 0; |
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|
1967 |
} |
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|
1968 |
|
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|
1969 |
/** |
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|
1970 |
* Tries to steal and run tasks within the target's computation. |
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|
1971 |
* The maxTasks argument supports external usages; internal calls |
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|
1972 |
* use zero, allowing unbounded steps (external calls trap |
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changeset
|
1973 |
* non-positive values). |
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|
1974 |
* |
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|
1975 |
* @param w caller |
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|
1976 |
* @param maxTasks if non-zero, the maximum number of other tasks to run |
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|
1977 |
* @return task status on exit |
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|
1978 |
*/ |
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|
1979 |
final int helpComplete(WorkQueue w, CountedCompleter<?> task, |
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|
1980 |
int maxTasks) { |
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changeset
|
1981 |
return (w == null) ? 0 : w.localHelpCC(task, maxTasks); |
14914
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|
1982 |
} |
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|
1983 |
|
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|
1984 |
/** |
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|
1985 |
* Returns a cheap heuristic guide for task partitioning when |
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changeset
|
1986 |
* programmers, frameworks, tools, or languages have little or no |
26448 | 1987 |
* idea about task granularity. In essence, by offering this |
14914
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|
1988 |
* method, we ask users only about tradeoffs in overhead vs |
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changeset
|
1989 |
* expected throughput and its variance, rather than how finely to |
69bfd88e3ea1
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changeset
|
1990 |
* partition tasks. |
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changeset
|
1991 |
* |
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|
1992 |
* In a steady state strict (tree-structured) computation, each |
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changeset
|
1993 |
* thread makes available for stealing enough tasks for other |
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changeset
|
1994 |
* threads to remain active. Inductively, if all threads play by |
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changeset
|
1995 |
* the same rules, each thread should make available only a |
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|
1996 |
* constant number of tasks. |
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|
1997 |
* |
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|
1998 |
* The minimum useful constant is just 1. But using a value of 1 |
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|
1999 |
* would require immediate replenishment upon each steal to |
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|
2000 |
* maintain enough tasks, which is infeasible. Further, |
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changeset
|
2001 |
* partitionings/granularities of offered tasks should minimize |
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|
2002 |
* steal rates, which in general means that threads nearer the top |
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|
2003 |
* of computation tree should generate more than those nearer the |
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changeset
|
2004 |
* bottom. In perfect steady state, each thread is at |
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changeset
|
2005 |
* approximately the same level of computation tree. However, |
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|
2006 |
* producing extra tasks amortizes the uncertainty of progress and |
69bfd88e3ea1
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changeset
|
2007 |
* diffusion assumptions. |
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changeset
|
2008 |
* |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
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parents:
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changeset
|
2009 |
* So, users will want to use values larger (but not much larger) |
14914
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|
2010 |
* than 1 to both smooth over transient shortages and hedge |
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|
2011 |
* against uneven progress; as traded off against the cost of |
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|
2012 |
* extra task overhead. We leave the user to pick a threshold |
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changeset
|
2013 |
* value to compare with the results of this call to guide |
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changeset
|
2014 |
* decisions, but recommend values such as 3. |
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|
2015 |
* |
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|
2016 |
* When all threads are active, it is on average OK to estimate |
69bfd88e3ea1
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|
2017 |
* surplus strictly locally. In steady-state, if one thread is |
69bfd88e3ea1
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changeset
|
2018 |
* maintaining say 2 surplus tasks, then so are others. So we can |
69bfd88e3ea1
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changeset
|
2019 |
* just use estimated queue length. However, this strategy alone |
69bfd88e3ea1
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changeset
|
2020 |
* leads to serious mis-estimates in some non-steady-state |
69bfd88e3ea1
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changeset
|
2021 |
* conditions (ramp-up, ramp-down, other stalls). We can detect |
69bfd88e3ea1
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|
2022 |
* many of these by further considering the number of "idle" |
69bfd88e3ea1
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changeset
|
2023 |
* threads, that are known to have zero queued tasks, so |
69bfd88e3ea1
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changeset
|
2024 |
* compensate by a factor of (#idle/#active) threads. |
6543 | 2025 |
*/ |
14914
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|
2026 |
static int getSurplusQueuedTaskCount() { |
69bfd88e3ea1
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changeset
|
2027 |
Thread t; ForkJoinWorkerThread wt; ForkJoinPool pool; WorkQueue q; |
39723
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changeset
|
2028 |
if (((t = Thread.currentThread()) instanceof ForkJoinWorkerThread) && |
9aa34e4a0469
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changeset
|
2029 |
(pool = (wt = (ForkJoinWorkerThread)t).pool) != null && |
9aa34e4a0469
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|
2030 |
(q = wt.workQueue) != null) { |
9aa34e4a0469
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changeset
|
2031 |
int p = pool.mode & SMASK; |
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changeset
|
2032 |
int a = p + (int)(pool.ctl >> RC_SHIFT); |
9aa34e4a0469
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changeset
|
2033 |
int n = q.top - q.base; |
14914
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|
2034 |
return n - (a > (p >>>= 1) ? 0 : |
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changeset
|
2035 |
a > (p >>>= 1) ? 1 : |
69bfd88e3ea1
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changeset
|
2036 |
a > (p >>>= 1) ? 2 : |
69bfd88e3ea1
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changeset
|
2037 |
a > (p >>>= 1) ? 4 : |
69bfd88e3ea1
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changeset
|
2038 |
8); |
69bfd88e3ea1
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changeset
|
2039 |
} |
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diff
changeset
|
2040 |
return 0; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2041 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2042 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2043 |
// Termination |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2044 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2045 |
/** |
26448 | 2046 |
* Possibly initiates and/or completes termination. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2047 |
* |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2048 |
* @param now if true, unconditionally terminate, else only |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2049 |
* if no work and no active workers |
32988 | 2050 |
* @param enable if true, terminate when next possible |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2051 |
* @return true if terminating or terminated |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2052 |
*/ |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2053 |
private boolean tryTerminate(boolean now, boolean enable) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2054 |
int md; // 3 phases: try to set SHUTDOWN, then STOP, then TERMINATED |
32988 | 2055 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2056 |
while (((md = mode) & SHUTDOWN) == 0) { |
32988 | 2057 |
if (!enable || this == common) // cannot shutdown |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2058 |
return false; |
32988 | 2059 |
else |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2060 |
MODE.compareAndSet(this, md, md | SHUTDOWN); |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2061 |
} |
26448 | 2062 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2063 |
while (((md = mode) & STOP) == 0) { // try to initiate termination |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2064 |
if (!now) { // check if quiescent & empty |
26448 | 2065 |
for (long oldSum = 0L;;) { // repeat until stable |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2066 |
boolean running = false; |
26448 | 2067 |
long checkSum = ctl; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2068 |
WorkQueue[] ws = workQueues; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2069 |
if ((md & SMASK) + (int)(checkSum >> RC_SHIFT) > 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2070 |
running = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2071 |
else if (ws != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2072 |
WorkQueue w; int b; |
32988 | 2073 |
for (int i = 0; i < ws.length; ++i) { |
2074 |
if ((w = ws[i]) != null) { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2075 |
checkSum += (b = w.base) + w.id; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2076 |
if (b != w.top || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2077 |
((i & 1) == 1 && w.source >= 0)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2078 |
running = true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2079 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2080 |
} |
26448 | 2081 |
} |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2082 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2083 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2084 |
if (((md = mode) & STOP) != 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2085 |
break; // already triggered |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2086 |
else if (running) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2087 |
return false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2088 |
else if (workQueues == ws && oldSum == (oldSum = checkSum)) |
26448 | 2089 |
break; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2090 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2091 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2092 |
if ((md & STOP) == 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2093 |
MODE.compareAndSet(this, md, md | STOP); |
26448 | 2094 |
} |
2095 |
||
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2096 |
while (((md = mode) & TERMINATED) == 0) { // help terminate others |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2097 |
for (long oldSum = 0L;;) { // repeat until stable |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2098 |
WorkQueue[] ws; WorkQueue w; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2099 |
long checkSum = ctl; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2100 |
if ((ws = workQueues) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2101 |
for (int i = 0; i < ws.length; ++i) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2102 |
if ((w = ws[i]) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2103 |
ForkJoinWorkerThread wt = w.owner; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2104 |
w.cancelAll(); // clear queues |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2105 |
if (wt != null) { |
32988 | 2106 |
try { // unblock join or park |
26448 | 2107 |
wt.interrupt(); |
2108 |
} catch (Throwable ignore) { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2109 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2110 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2111 |
checkSum += w.base + w.id; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2112 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2113 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2114 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2115 |
if (((md = mode) & TERMINATED) != 0 || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2116 |
(workQueues == ws && oldSum == (oldSum = checkSum))) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2117 |
break; |
26448 | 2118 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2119 |
if ((md & TERMINATED) != 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2120 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2121 |
else if ((md & SMASK) + (short)(ctl >>> TC_SHIFT) > 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2122 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2123 |
else if (MODE.compareAndSet(this, md, md | TERMINATED)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2124 |
synchronized (this) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2125 |
notifyAll(); // for awaitTermination |
32988 | 2126 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2127 |
break; |
32988 | 2128 |
} |
2129 |
} |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2130 |
return true; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2131 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2132 |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2133 |
// Exported methods |
4110 | 2134 |
|
2135 |
// Constructors |
|
2136 |
||
2137 |
/** |
|
2138 |
* Creates a {@code ForkJoinPool} with parallelism equal to {@link |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2139 |
* java.lang.Runtime#availableProcessors}, using defaults for all |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2140 |
* other parameters (see {@link #ForkJoinPool(int, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2141 |
* ForkJoinWorkerThreadFactory, UncaughtExceptionHandler, boolean, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2142 |
* int, int, int, Predicate, long, TimeUnit)}). |
4110 | 2143 |
* |
2144 |
* @throws SecurityException if a security manager exists and |
|
2145 |
* the caller is not permitted to modify threads |
|
2146 |
* because it does not hold {@link |
|
2147 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
|
2148 |
*/ |
|
2149 |
public ForkJoinPool() { |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2150 |
this(Math.min(MAX_CAP, Runtime.getRuntime().availableProcessors()), |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2151 |
defaultForkJoinWorkerThreadFactory, null, false, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2152 |
0, MAX_CAP, 1, null, DEFAULT_KEEPALIVE, TimeUnit.MILLISECONDS); |
4110 | 2153 |
} |
2154 |
||
2155 |
/** |
|
2156 |
* Creates a {@code ForkJoinPool} with the indicated parallelism |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2157 |
* level, using defaults for all other parameters (see {@link |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2158 |
* #ForkJoinPool(int, ForkJoinWorkerThreadFactory, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2159 |
* UncaughtExceptionHandler, boolean, int, int, int, Predicate, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2160 |
* long, TimeUnit)}). |
4110 | 2161 |
* |
2162 |
* @param parallelism the parallelism level |
|
2163 |
* @throws IllegalArgumentException if parallelism less than or |
|
2164 |
* equal to zero, or greater than implementation limit |
|
2165 |
* @throws SecurityException if a security manager exists and |
|
2166 |
* the caller is not permitted to modify threads |
|
2167 |
* because it does not hold {@link |
|
2168 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
|
2169 |
*/ |
|
2170 |
public ForkJoinPool(int parallelism) { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2171 |
this(parallelism, defaultForkJoinWorkerThreadFactory, null, false, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2172 |
0, MAX_CAP, 1, null, DEFAULT_KEEPALIVE, TimeUnit.MILLISECONDS); |
4110 | 2173 |
} |
2174 |
||
2175 |
/** |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2176 |
* Creates a {@code ForkJoinPool} with the given parameters (using |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2177 |
* defaults for others -- see {@link #ForkJoinPool(int, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2178 |
* ForkJoinWorkerThreadFactory, UncaughtExceptionHandler, boolean, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2179 |
* int, int, int, Predicate, long, TimeUnit)}). |
4110 | 2180 |
* |
6543 | 2181 |
* @param parallelism the parallelism level. For default value, |
2182 |
* use {@link java.lang.Runtime#availableProcessors}. |
|
2183 |
* @param factory the factory for creating new threads. For default value, |
|
2184 |
* use {@link #defaultForkJoinWorkerThreadFactory}. |
|
2185 |
* @param handler the handler for internal worker threads that |
|
2186 |
* terminate due to unrecoverable errors encountered while executing |
|
2187 |
* tasks. For default value, use {@code null}. |
|
2188 |
* @param asyncMode if true, |
|
2189 |
* establishes local first-in-first-out scheduling mode for forked |
|
2190 |
* tasks that are never joined. This mode may be more appropriate |
|
2191 |
* than default locally stack-based mode in applications in which |
|
2192 |
* worker threads only process event-style asynchronous tasks. |
|
2193 |
* For default value, use {@code false}. |
|
4110 | 2194 |
* @throws IllegalArgumentException if parallelism less than or |
2195 |
* equal to zero, or greater than implementation limit |
|
2196 |
* @throws NullPointerException if the factory is null |
|
2197 |
* @throws SecurityException if a security manager exists and |
|
2198 |
* the caller is not permitted to modify threads |
|
2199 |
* because it does not hold {@link |
|
2200 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
|
2201 |
*/ |
|
6543 | 2202 |
public ForkJoinPool(int parallelism, |
2203 |
ForkJoinWorkerThreadFactory factory, |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2204 |
UncaughtExceptionHandler handler, |
6543 | 2205 |
boolean asyncMode) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2206 |
this(parallelism, factory, handler, asyncMode, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2207 |
0, MAX_CAP, 1, null, DEFAULT_KEEPALIVE, TimeUnit.MILLISECONDS); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2208 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2209 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2210 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2211 |
* Creates a {@code ForkJoinPool} with the given parameters. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2212 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2213 |
* @param parallelism the parallelism level. For default value, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2214 |
* use {@link java.lang.Runtime#availableProcessors}. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2215 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2216 |
* @param factory the factory for creating new threads. For |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2217 |
* default value, use {@link #defaultForkJoinWorkerThreadFactory}. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2218 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2219 |
* @param handler the handler for internal worker threads that |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2220 |
* terminate due to unrecoverable errors encountered while |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2221 |
* executing tasks. For default value, use {@code null}. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2222 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2223 |
* @param asyncMode if true, establishes local first-in-first-out |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2224 |
* scheduling mode for forked tasks that are never joined. This |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2225 |
* mode may be more appropriate than default locally stack-based |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2226 |
* mode in applications in which worker threads only process |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2227 |
* event-style asynchronous tasks. For default value, use {@code |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2228 |
* false}. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2229 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2230 |
* @param corePoolSize the number of threads to keep in the pool |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2231 |
* (unless timed out after an elapsed keep-alive). Normally (and |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2232 |
* by default) this is the same value as the parallelism level, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2233 |
* but may be set to a larger value to reduce dynamic overhead if |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2234 |
* tasks regularly block. Using a smaller value (for example |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2235 |
* {@code 0}) has the same effect as the default. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2236 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2237 |
* @param maximumPoolSize the maximum number of threads allowed. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2238 |
* When the maximum is reached, attempts to replace blocked |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2239 |
* threads fail. (However, because creation and termination of |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2240 |
* different threads may overlap, and may be managed by the given |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2241 |
* thread factory, this value may be transiently exceeded.) To |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2242 |
* arrange the same value as is used by default for the common |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2243 |
* pool, use {@code 256} plus the {@code parallelism} level. (By |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2244 |
* default, the common pool allows a maximum of 256 spare |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2245 |
* threads.) Using a value (for example {@code |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2246 |
* Integer.MAX_VALUE}) larger than the implementation's total |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2247 |
* thread limit has the same effect as using this limit (which is |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2248 |
* the default). |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2249 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2250 |
* @param minimumRunnable the minimum allowed number of core |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2251 |
* threads not blocked by a join or {@link ManagedBlocker}. To |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2252 |
* ensure progress, when too few unblocked threads exist and |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2253 |
* unexecuted tasks may exist, new threads are constructed, up to |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2254 |
* the given maximumPoolSize. For the default value, use {@code |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2255 |
* 1}, that ensures liveness. A larger value might improve |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2256 |
* throughput in the presence of blocked activities, but might |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2257 |
* not, due to increased overhead. A value of zero may be |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2258 |
* acceptable when submitted tasks cannot have dependencies |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2259 |
* requiring additional threads. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2260 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2261 |
* @param saturate if non-null, a predicate invoked upon attempts |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2262 |
* to create more than the maximum total allowed threads. By |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2263 |
* default, when a thread is about to block on a join or {@link |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2264 |
* ManagedBlocker}, but cannot be replaced because the |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2265 |
* maximumPoolSize would be exceeded, a {@link |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2266 |
* RejectedExecutionException} is thrown. But if this predicate |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2267 |
* returns {@code true}, then no exception is thrown, so the pool |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2268 |
* continues to operate with fewer than the target number of |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2269 |
* runnable threads, which might not ensure progress. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2270 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2271 |
* @param keepAliveTime the elapsed time since last use before |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2272 |
* a thread is terminated (and then later replaced if needed). |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2273 |
* For the default value, use {@code 60, TimeUnit.SECONDS}. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2274 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2275 |
* @param unit the time unit for the {@code keepAliveTime} argument |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2276 |
* |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2277 |
* @throws IllegalArgumentException if parallelism is less than or |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2278 |
* equal to zero, or is greater than implementation limit, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2279 |
* or if maximumPoolSize is less than parallelism, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2280 |
* of if the keepAliveTime is less than or equal to zero. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2281 |
* @throws NullPointerException if the factory is null |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2282 |
* @throws SecurityException if a security manager exists and |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2283 |
* the caller is not permitted to modify threads |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2284 |
* because it does not hold {@link |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2285 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2286 |
* @since 9 |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2287 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2288 |
public ForkJoinPool(int parallelism, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2289 |
ForkJoinWorkerThreadFactory factory, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2290 |
UncaughtExceptionHandler handler, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2291 |
boolean asyncMode, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2292 |
int corePoolSize, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2293 |
int maximumPoolSize, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2294 |
int minimumRunnable, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2295 |
Predicate<? super ForkJoinPool> saturate, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2296 |
long keepAliveTime, |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2297 |
TimeUnit unit) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2298 |
// check, encode, pack parameters |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2299 |
if (parallelism <= 0 || parallelism > MAX_CAP || |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2300 |
maximumPoolSize < parallelism || keepAliveTime <= 0L) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2301 |
throw new IllegalArgumentException(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2302 |
if (factory == null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2303 |
throw new NullPointerException(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2304 |
long ms = Math.max(unit.toMillis(keepAliveTime), TIMEOUT_SLOP); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2305 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2306 |
int corep = Math.min(Math.max(corePoolSize, parallelism), MAX_CAP); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2307 |
long c = ((((long)(-corep) << TC_SHIFT) & TC_MASK) | |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2308 |
(((long)(-parallelism) << RC_SHIFT) & RC_MASK)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2309 |
int m = parallelism | (asyncMode ? FIFO : 0); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2310 |
int maxSpares = Math.min(maximumPoolSize, MAX_CAP) - parallelism; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2311 |
int minAvail = Math.min(Math.max(minimumRunnable, 0), MAX_CAP); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2312 |
int b = ((minAvail - parallelism) & SMASK) | (maxSpares << SWIDTH); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2313 |
int n = (parallelism > 1) ? parallelism - 1 : 1; // at least 2 slots |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2314 |
n |= n >>> 1; n |= n >>> 2; n |= n >>> 4; n |= n >>> 8; n |= n >>> 16; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2315 |
n = (n + 1) << 1; // power of two, including space for submission queues |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2316 |
|
41131
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2317 |
this.workerNamePrefix = "ForkJoinPool-" + nextPoolId() + "-worker-"; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2318 |
this.workQueues = new WorkQueue[n]; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2319 |
this.factory = factory; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2320 |
this.ueh = handler; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2321 |
this.saturate = saturate; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2322 |
this.keepAlive = ms; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2323 |
this.bounds = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2324 |
this.mode = m; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2325 |
this.ctl = c; |
6543 | 2326 |
checkPermission(); |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2327 |
} |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2328 |
|
41131
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2329 |
private Object newInstanceFromSystemProperty(String property) |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2330 |
throws ReflectiveOperationException { |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2331 |
String className = System.getProperty(property); |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2332 |
return (className == null) |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2333 |
? null |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2334 |
: ClassLoader.getSystemClassLoader().loadClass(className) |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2335 |
.getConstructor().newInstance(); |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2336 |
} |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2337 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2338 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2339 |
* Constructor for common pool using parameters possibly |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2340 |
* overridden by system properties |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2341 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2342 |
private ForkJoinPool(byte forCommonPoolOnly) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2343 |
int parallelism = -1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2344 |
ForkJoinWorkerThreadFactory fac = null; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2345 |
UncaughtExceptionHandler handler = null; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2346 |
try { // ignore exceptions in accessing/parsing properties |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2347 |
String pp = System.getProperty |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2348 |
("java.util.concurrent.ForkJoinPool.common.parallelism"); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2349 |
if (pp != null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2350 |
parallelism = Integer.parseInt(pp); |
41131
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2351 |
fac = (ForkJoinWorkerThreadFactory) newInstanceFromSystemProperty( |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2352 |
"java.util.concurrent.ForkJoinPool.common.threadFactory"); |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2353 |
handler = (UncaughtExceptionHandler) newInstanceFromSystemProperty( |
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2354 |
"java.util.concurrent.ForkJoinPool.common.exceptionHandler"); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2355 |
} catch (Exception ignore) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2356 |
} |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2357 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2358 |
if (fac == null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2359 |
if (System.getSecurityManager() == null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2360 |
fac = defaultForkJoinWorkerThreadFactory; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2361 |
else // use security-managed default |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2362 |
fac = new InnocuousForkJoinWorkerThreadFactory(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2363 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2364 |
if (parallelism < 0 && // default 1 less than #cores |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2365 |
(parallelism = Runtime.getRuntime().availableProcessors() - 1) <= 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2366 |
parallelism = 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2367 |
if (parallelism > MAX_CAP) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2368 |
parallelism = MAX_CAP; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2369 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2370 |
long c = ((((long)(-parallelism) << TC_SHIFT) & TC_MASK) | |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2371 |
(((long)(-parallelism) << RC_SHIFT) & RC_MASK)); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2372 |
int b = ((1 - parallelism) & SMASK) | (COMMON_MAX_SPARES << SWIDTH); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2373 |
int n = (parallelism > 1) ? parallelism - 1 : 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2374 |
n |= n >>> 1; n |= n >>> 2; n |= n >>> 4; n |= n >>> 8; n |= n >>> 16; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2375 |
n = (n + 1) << 1; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2376 |
|
41131
87edc8451f8a
8165919: Miscellaneous changes imported from jsr166 CVS 2016-09-21
dl
parents:
40817
diff
changeset
|
2377 |
this.workerNamePrefix = "ForkJoinPool.commonPool-worker-"; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2378 |
this.workQueues = new WorkQueue[n]; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2379 |
this.factory = fac; |
6543 | 2380 |
this.ueh = handler; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2381 |
this.saturate = null; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2382 |
this.keepAlive = DEFAULT_KEEPALIVE; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2383 |
this.bounds = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2384 |
this.mode = parallelism; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2385 |
this.ctl = c; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2386 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2387 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2388 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2389 |
* Returns the common pool instance. This pool is statically |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2390 |
* constructed; its run state is unaffected by attempts to {@link |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2391 |
* #shutdown} or {@link #shutdownNow}. However this pool and any |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2392 |
* ongoing processing are automatically terminated upon program |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2393 |
* {@link System#exit}. Any program that relies on asynchronous |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2394 |
* task processing to complete before program termination should |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2395 |
* invoke {@code commonPool().}{@link #awaitQuiescence awaitQuiescence}, |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2396 |
* before exit. |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2397 |
* |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2398 |
* @return the common pool instance |
15002
8ab8c2b2eee6
8005709: Add at since tags to new FJP getCommonPoolParallelism and commonPool
chegar
parents:
14914
diff
changeset
|
2399 |
* @since 1.8 |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2400 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2401 |
public static ForkJoinPool commonPool() { |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2402 |
// assert common != null : "static init error"; |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2403 |
return common; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2404 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2405 |
|
4110 | 2406 |
// Execution methods |
2407 |
||
2408 |
/** |
|
2409 |
* Performs the given task, returning its result upon completion. |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2410 |
* If the computation encounters an unchecked Exception or Error, |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2411 |
* it is rethrown as the outcome of this invocation. Rethrown |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2412 |
* exceptions behave in the same way as regular exceptions, but, |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2413 |
* when possible, contain stack traces (as displayed for example |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2414 |
* using {@code ex.printStackTrace()}) of both the current thread |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2415 |
* as well as the thread actually encountering the exception; |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2416 |
* minimally only the latter. |
4110 | 2417 |
* |
2418 |
* @param task the task |
|
19048
7d0a94c79779
8021417: Fix doclint issues in java.util.concurrent
chegar
parents:
18790
diff
changeset
|
2419 |
* @param <T> the type of the task's result |
4110 | 2420 |
* @return the task's result |
2421 |
* @throws NullPointerException if the task is null |
|
2422 |
* @throws RejectedExecutionException if the task cannot be |
|
2423 |
* scheduled for execution |
|
2424 |
*/ |
|
2425 |
public <T> T invoke(ForkJoinTask<T> task) { |
|
7976
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2426 |
if (task == null) |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2427 |
throw new NullPointerException(); |
32988 | 2428 |
externalSubmit(task); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2429 |
return task.join(); |
4110 | 2430 |
} |
2431 |
||
2432 |
/** |
|
2433 |
* Arranges for (asynchronous) execution of the given task. |
|
2434 |
* |
|
2435 |
* @param task the task |
|
2436 |
* @throws NullPointerException if the task is null |
|
2437 |
* @throws RejectedExecutionException if the task cannot be |
|
2438 |
* scheduled for execution |
|
2439 |
*/ |
|
2440 |
public void execute(ForkJoinTask<?> task) { |
|
32988 | 2441 |
externalSubmit(task); |
4110 | 2442 |
} |
2443 |
||
2444 |
// AbstractExecutorService methods |
|
2445 |
||
2446 |
/** |
|
2447 |
* @throws NullPointerException if the task is null |
|
2448 |
* @throws RejectedExecutionException if the task cannot be |
|
2449 |
* scheduled for execution |
|
2450 |
*/ |
|
2451 |
public void execute(Runnable task) { |
|
7976
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2452 |
if (task == null) |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2453 |
throw new NullPointerException(); |
4110 | 2454 |
ForkJoinTask<?> job; |
2455 |
if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
|
2456 |
job = (ForkJoinTask<?>) task; |
|
2457 |
else |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2458 |
job = new ForkJoinTask.RunnableExecuteAction(task); |
32988 | 2459 |
externalSubmit(job); |
4110 | 2460 |
} |
2461 |
||
2462 |
/** |
|
6543 | 2463 |
* Submits a ForkJoinTask for execution. |
2464 |
* |
|
2465 |
* @param task the task to submit |
|
19048
7d0a94c79779
8021417: Fix doclint issues in java.util.concurrent
chegar
parents:
18790
diff
changeset
|
2466 |
* @param <T> the type of the task's result |
6543 | 2467 |
* @return the task |
2468 |
* @throws NullPointerException if the task is null |
|
2469 |
* @throws RejectedExecutionException if the task cannot be |
|
2470 |
* scheduled for execution |
|
2471 |
*/ |
|
2472 |
public <T> ForkJoinTask<T> submit(ForkJoinTask<T> task) { |
|
32988 | 2473 |
return externalSubmit(task); |
6543 | 2474 |
} |
2475 |
||
2476 |
/** |
|
4110 | 2477 |
* @throws NullPointerException if the task is null |
2478 |
* @throws RejectedExecutionException if the task cannot be |
|
2479 |
* scheduled for execution |
|
2480 |
*/ |
|
2481 |
public <T> ForkJoinTask<T> submit(Callable<T> task) { |
|
32988 | 2482 |
return externalSubmit(new ForkJoinTask.AdaptedCallable<T>(task)); |
4110 | 2483 |
} |
2484 |
||
2485 |
/** |
|
2486 |
* @throws NullPointerException if the task is null |
|
2487 |
* @throws RejectedExecutionException if the task cannot be |
|
2488 |
* scheduled for execution |
|
2489 |
*/ |
|
2490 |
public <T> ForkJoinTask<T> submit(Runnable task, T result) { |
|
32988 | 2491 |
return externalSubmit(new ForkJoinTask.AdaptedRunnable<T>(task, result)); |
4110 | 2492 |
} |
2493 |
||
2494 |
/** |
|
2495 |
* @throws NullPointerException if the task is null |
|
2496 |
* @throws RejectedExecutionException if the task cannot be |
|
2497 |
* scheduled for execution |
|
2498 |
*/ |
|
2499 |
public ForkJoinTask<?> submit(Runnable task) { |
|
7976
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2500 |
if (task == null) |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2501 |
throw new NullPointerException(); |
4110 | 2502 |
ForkJoinTask<?> job; |
2503 |
if (task instanceof ForkJoinTask<?>) // avoid re-wrap |
|
2504 |
job = (ForkJoinTask<?>) task; |
|
2505 |
else |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2506 |
job = new ForkJoinTask.AdaptedRunnableAction(task); |
32988 | 2507 |
return externalSubmit(job); |
4110 | 2508 |
} |
2509 |
||
2510 |
/** |
|
2511 |
* @throws NullPointerException {@inheritDoc} |
|
2512 |
* @throws RejectedExecutionException {@inheritDoc} |
|
2513 |
*/ |
|
2514 |
public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2515 |
// In previous versions of this class, this method constructed |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2516 |
// a task to run ForkJoinTask.invokeAll, but now external |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2517 |
// invocation of multiple tasks is at least as efficient. |
26448 | 2518 |
ArrayList<Future<T>> futures = new ArrayList<>(tasks.size()); |
4110 | 2519 |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2520 |
try { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2521 |
for (Callable<T> t : tasks) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2522 |
ForkJoinTask<T> f = new ForkJoinTask.AdaptedCallable<T>(t); |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2523 |
futures.add(f); |
32988 | 2524 |
externalSubmit(f); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2525 |
} |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2526 |
for (int i = 0, size = futures.size(); i < size; i++) |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2527 |
((ForkJoinTask<?>)futures.get(i)).quietlyJoin(); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2528 |
return futures; |
32988 | 2529 |
} catch (Throwable t) { |
2530 |
for (int i = 0, size = futures.size(); i < size; i++) |
|
2531 |
futures.get(i).cancel(false); |
|
2532 |
throw t; |
|
4110 | 2533 |
} |
2534 |
} |
|
2535 |
||
2536 |
/** |
|
2537 |
* Returns the factory used for constructing new workers. |
|
2538 |
* |
|
2539 |
* @return the factory used for constructing new workers |
|
2540 |
*/ |
|
2541 |
public ForkJoinWorkerThreadFactory getFactory() { |
|
2542 |
return factory; |
|
2543 |
} |
|
2544 |
||
2545 |
/** |
|
2546 |
* Returns the handler for internal worker threads that terminate |
|
2547 |
* due to unrecoverable errors encountered while executing tasks. |
|
2548 |
* |
|
2549 |
* @return the handler, or {@code null} if none |
|
2550 |
*/ |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2551 |
public UncaughtExceptionHandler getUncaughtExceptionHandler() { |
6543 | 2552 |
return ueh; |
4110 | 2553 |
} |
2554 |
||
2555 |
/** |
|
2556 |
* Returns the targeted parallelism level of this pool. |
|
2557 |
* |
|
2558 |
* @return the targeted parallelism level of this pool |
|
2559 |
*/ |
|
2560 |
public int getParallelism() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2561 |
int par = mode & SMASK; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2562 |
return (par > 0) ? par : 1; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2563 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2564 |
|
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2565 |
/** |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2566 |
* Returns the targeted parallelism level of the common pool. |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2567 |
* |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2568 |
* @return the targeted parallelism level of the common pool |
15002
8ab8c2b2eee6
8005709: Add at since tags to new FJP getCommonPoolParallelism and commonPool
chegar
parents:
14914
diff
changeset
|
2569 |
* @since 1.8 |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2570 |
*/ |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2571 |
public static int getCommonPoolParallelism() { |
32988 | 2572 |
return COMMON_PARALLELISM; |
4110 | 2573 |
} |
2574 |
||
2575 |
/** |
|
2576 |
* Returns the number of worker threads that have started but not |
|
6543 | 2577 |
* yet terminated. The result returned by this method may differ |
4110 | 2578 |
* from {@link #getParallelism} when threads are created to |
2579 |
* maintain parallelism when others are cooperatively blocked. |
|
2580 |
* |
|
2581 |
* @return the number of worker threads |
|
2582 |
*/ |
|
2583 |
public int getPoolSize() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2584 |
return ((mode & SMASK) + (short)(ctl >>> TC_SHIFT)); |
4110 | 2585 |
} |
2586 |
||
2587 |
/** |
|
2588 |
* Returns {@code true} if this pool uses local first-in-first-out |
|
2589 |
* scheduling mode for forked tasks that are never joined. |
|
2590 |
* |
|
2591 |
* @return {@code true} if this pool uses async mode |
|
2592 |
*/ |
|
2593 |
public boolean getAsyncMode() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2594 |
return (mode & FIFO) != 0; |
4110 | 2595 |
} |
2596 |
||
2597 |
/** |
|
2598 |
* Returns an estimate of the number of worker threads that are |
|
2599 |
* not blocked waiting to join tasks or for other managed |
|
6543 | 2600 |
* synchronization. This method may overestimate the |
2601 |
* number of running threads. |
|
4110 | 2602 |
* |
2603 |
* @return the number of worker threads |
|
2604 |
*/ |
|
2605 |
public int getRunningThreadCount() { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2606 |
int rc = 0; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2607 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2608 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2609 |
for (int i = 1; i < ws.length; i += 2) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2610 |
if ((w = ws[i]) != null && w.isApparentlyUnblocked()) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2611 |
++rc; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2612 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2613 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2614 |
return rc; |
4110 | 2615 |
} |
2616 |
||
2617 |
/** |
|
2618 |
* Returns an estimate of the number of threads that are currently |
|
2619 |
* stealing or executing tasks. This method may overestimate the |
|
2620 |
* number of active threads. |
|
2621 |
* |
|
2622 |
* @return the number of active threads |
|
2623 |
*/ |
|
2624 |
public int getActiveThreadCount() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2625 |
int r = (mode & SMASK) + (int)(ctl >> RC_SHIFT); |
9278 | 2626 |
return (r <= 0) ? 0 : r; // suppress momentarily negative values |
4110 | 2627 |
} |
2628 |
||
2629 |
/** |
|
2630 |
* Returns {@code true} if all worker threads are currently idle. |
|
2631 |
* An idle worker is one that cannot obtain a task to execute |
|
2632 |
* because none are available to steal from other threads, and |
|
2633 |
* there are no pending submissions to the pool. This method is |
|
2634 |
* conservative; it might not return {@code true} immediately upon |
|
2635 |
* idleness of all threads, but will eventually become true if |
|
2636 |
* threads remain inactive. |
|
2637 |
* |
|
2638 |
* @return {@code true} if all threads are currently idle |
|
2639 |
*/ |
|
2640 |
public boolean isQuiescent() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2641 |
for (;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2642 |
long c = ctl; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2643 |
int md = mode, pc = md & SMASK; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2644 |
int tc = pc + (short)(c >>> TC_SHIFT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2645 |
int rc = pc + (int)(c >> RC_SHIFT); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2646 |
if ((md & (STOP | TERMINATED)) != 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2647 |
return true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2648 |
else if (rc > 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2649 |
return false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2650 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2651 |
WorkQueue[] ws; WorkQueue v; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2652 |
if ((ws = workQueues) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2653 |
for (int i = 1; i < ws.length; i += 2) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2654 |
if ((v = ws[i]) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2655 |
if ((v.source & QUIET) == 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2656 |
return false; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2657 |
--tc; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2658 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2659 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2660 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2661 |
if (tc == 0 && ctl == c) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2662 |
return true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2663 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2664 |
} |
4110 | 2665 |
} |
2666 |
||
2667 |
/** |
|
2668 |
* Returns an estimate of the total number of tasks stolen from |
|
2669 |
* one thread's work queue by another. The reported value |
|
2670 |
* underestimates the actual total number of steals when the pool |
|
2671 |
* is not quiescent. This value may be useful for monitoring and |
|
2672 |
* tuning fork/join programs: in general, steal counts should be |
|
2673 |
* high enough to keep threads busy, but low enough to avoid |
|
2674 |
* overhead and contention across threads. |
|
2675 |
* |
|
2676 |
* @return the number of steals |
|
2677 |
*/ |
|
2678 |
public long getStealCount() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2679 |
long count = stealCount; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2680 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2681 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2682 |
for (int i = 1; i < ws.length; i += 2) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2683 |
if ((w = ws[i]) != null) |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2684 |
count += (long)w.nsteals & 0xffffffffL; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2685 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2686 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2687 |
return count; |
4110 | 2688 |
} |
2689 |
||
2690 |
/** |
|
2691 |
* Returns an estimate of the total number of tasks currently held |
|
2692 |
* in queues by worker threads (but not including tasks submitted |
|
2693 |
* to the pool that have not begun executing). This value is only |
|
2694 |
* an approximation, obtained by iterating across all threads in |
|
2695 |
* the pool. This method may be useful for tuning task |
|
2696 |
* granularities. |
|
2697 |
* |
|
2698 |
* @return the number of queued tasks |
|
2699 |
*/ |
|
2700 |
public long getQueuedTaskCount() { |
|
2701 |
long count = 0; |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2702 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2703 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2704 |
for (int i = 1; i < ws.length; i += 2) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2705 |
if ((w = ws[i]) != null) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2706 |
count += w.queueSize(); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2707 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2708 |
} |
4110 | 2709 |
return count; |
2710 |
} |
|
2711 |
||
2712 |
/** |
|
2713 |
* Returns an estimate of the number of tasks submitted to this |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2714 |
* pool that have not yet begun executing. This method may take |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2715 |
* time proportional to the number of submissions. |
4110 | 2716 |
* |
2717 |
* @return the number of queued submissions |
|
2718 |
*/ |
|
2719 |
public int getQueuedSubmissionCount() { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2720 |
int count = 0; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2721 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2722 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2723 |
for (int i = 0; i < ws.length; i += 2) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2724 |
if ((w = ws[i]) != null) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2725 |
count += w.queueSize(); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2726 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2727 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2728 |
return count; |
4110 | 2729 |
} |
2730 |
||
2731 |
/** |
|
2732 |
* Returns {@code true} if there are any tasks submitted to this |
|
2733 |
* pool that have not yet begun executing. |
|
2734 |
* |
|
2735 |
* @return {@code true} if there are any queued submissions |
|
2736 |
*/ |
|
2737 |
public boolean hasQueuedSubmissions() { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2738 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2739 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2740 |
for (int i = 0; i < ws.length; i += 2) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2741 |
if ((w = ws[i]) != null && !w.isEmpty()) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2742 |
return true; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2743 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2744 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2745 |
return false; |
4110 | 2746 |
} |
2747 |
||
2748 |
/** |
|
2749 |
* Removes and returns the next unexecuted submission if one is |
|
2750 |
* available. This method may be useful in extensions to this |
|
2751 |
* class that re-assign work in systems with multiple pools. |
|
2752 |
* |
|
2753 |
* @return the next submission, or {@code null} if none |
|
2754 |
*/ |
|
2755 |
protected ForkJoinTask<?> pollSubmission() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2756 |
return pollScan(true); |
4110 | 2757 |
} |
2758 |
||
2759 |
/** |
|
2760 |
* Removes all available unexecuted submitted and forked tasks |
|
2761 |
* from scheduling queues and adds them to the given collection, |
|
2762 |
* without altering their execution status. These may include |
|
2763 |
* artificially generated or wrapped tasks. This method is |
|
2764 |
* designed to be invoked only when the pool is known to be |
|
2765 |
* quiescent. Invocations at other times may not remove all |
|
2766 |
* tasks. A failure encountered while attempting to add elements |
|
2767 |
* to collection {@code c} may result in elements being in |
|
2768 |
* neither, either or both collections when the associated |
|
2769 |
* exception is thrown. The behavior of this operation is |
|
2770 |
* undefined if the specified collection is modified while the |
|
2771 |
* operation is in progress. |
|
2772 |
* |
|
2773 |
* @param c the collection to transfer elements into |
|
2774 |
* @return the number of elements transferred |
|
2775 |
*/ |
|
2776 |
protected int drainTasksTo(Collection<? super ForkJoinTask<?>> c) { |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2777 |
int count = 0; |
14914
69bfd88e3ea1
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dl
parents:
11279
diff
changeset
|
2778 |
WorkQueue[] ws; WorkQueue w; ForkJoinTask<?> t; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2779 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2780 |
for (int i = 0; i < ws.length; ++i) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2781 |
if ((w = ws[i]) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2782 |
while ((t = w.poll()) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2783 |
c.add(t); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2784 |
++count; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2785 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2786 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2787 |
} |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2788 |
} |
6543 | 2789 |
return count; |
4110 | 2790 |
} |
2791 |
||
2792 |
/** |
|
2793 |
* Returns a string identifying this pool, as well as its state, |
|
2794 |
* including indications of run state, parallelism level, and |
|
2795 |
* worker and task counts. |
|
2796 |
* |
|
2797 |
* @return a string identifying this pool, as well as its state |
|
2798 |
*/ |
|
2799 |
public String toString() { |
|
14914
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8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2800 |
// Use a single pass through workQueues to collect counts |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2801 |
long qt = 0L, qs = 0L; int rc = 0; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2802 |
long st = stealCount; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2803 |
WorkQueue[] ws; WorkQueue w; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2804 |
if ((ws = workQueues) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2805 |
for (int i = 0; i < ws.length; ++i) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2806 |
if ((w = ws[i]) != null) { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2807 |
int size = w.queueSize(); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2808 |
if ((i & 1) == 0) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2809 |
qs += size; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2810 |
else { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2811 |
qt += size; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2812 |
st += (long)w.nsteals & 0xffffffffL; |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2813 |
if (w.isApparentlyUnblocked()) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2814 |
++rc; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2815 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2816 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2817 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2818 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2819 |
|
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2820 |
int md = mode; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2821 |
int pc = (md & SMASK); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2822 |
long c = ctl; |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2823 |
int tc = pc + (short)(c >>> TC_SHIFT); |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2824 |
int ac = pc + (int)(c >> RC_SHIFT); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2825 |
if (ac < 0) // ignore transient negative |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2826 |
ac = 0; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2827 |
String level = ((md & TERMINATED) != 0 ? "Terminated" : |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2828 |
(md & STOP) != 0 ? "Terminating" : |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2829 |
(md & SHUTDOWN) != 0 ? "Shutting down" : |
26448 | 2830 |
"Running"); |
4110 | 2831 |
return super.toString() + |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2832 |
"[" + level + |
6543 | 2833 |
", parallelism = " + pc + |
2834 |
", size = " + tc + |
|
2835 |
", active = " + ac + |
|
2836 |
", running = " + rc + |
|
4110 | 2837 |
", steals = " + st + |
2838 |
", tasks = " + qt + |
|
2839 |
", submissions = " + qs + |
|
2840 |
"]"; |
|
2841 |
} |
|
2842 |
||
2843 |
/** |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2844 |
* Possibly initiates an orderly shutdown in which previously |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2845 |
* submitted tasks are executed, but no new tasks will be |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2846 |
* accepted. Invocation has no effect on execution state if this |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2847 |
* is the {@link #commonPool()}, and no additional effect if |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2848 |
* already shut down. Tasks that are in the process of being |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2849 |
* submitted concurrently during the course of this method may or |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2850 |
* may not be rejected. |
4110 | 2851 |
* |
2852 |
* @throws SecurityException if a security manager exists and |
|
2853 |
* the caller is not permitted to modify threads |
|
2854 |
* because it does not hold {@link |
|
2855 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
|
2856 |
*/ |
|
2857 |
public void shutdown() { |
|
2858 |
checkPermission(); |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2859 |
tryTerminate(false, true); |
4110 | 2860 |
} |
2861 |
||
2862 |
/** |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2863 |
* Possibly attempts to cancel and/or stop all tasks, and reject |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2864 |
* all subsequently submitted tasks. Invocation has no effect on |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2865 |
* execution state if this is the {@link #commonPool()}, and no |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2866 |
* additional effect if already shut down. Otherwise, tasks that |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2867 |
* are in the process of being submitted or executed concurrently |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2868 |
* during the course of this method may or may not be |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2869 |
* rejected. This method cancels both existing and unexecuted |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2870 |
* tasks, in order to permit termination in the presence of task |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2871 |
* dependencies. So the method always returns an empty list |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2872 |
* (unlike the case for some other Executors). |
4110 | 2873 |
* |
2874 |
* @return an empty list |
|
2875 |
* @throws SecurityException if a security manager exists and |
|
2876 |
* the caller is not permitted to modify threads |
|
2877 |
* because it does not hold {@link |
|
2878 |
* java.lang.RuntimePermission}{@code ("modifyThread")} |
|
2879 |
*/ |
|
2880 |
public List<Runnable> shutdownNow() { |
|
2881 |
checkPermission(); |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2882 |
tryTerminate(true, true); |
4110 | 2883 |
return Collections.emptyList(); |
2884 |
} |
|
2885 |
||
2886 |
/** |
|
2887 |
* Returns {@code true} if all tasks have completed following shut down. |
|
2888 |
* |
|
2889 |
* @return {@code true} if all tasks have completed following shut down |
|
2890 |
*/ |
|
2891 |
public boolean isTerminated() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2892 |
return (mode & TERMINATED) != 0; |
4110 | 2893 |
} |
2894 |
||
2895 |
/** |
|
2896 |
* Returns {@code true} if the process of termination has |
|
2897 |
* commenced but not yet completed. This method may be useful for |
|
2898 |
* debugging. A return of {@code true} reported a sufficient |
|
2899 |
* period after shutdown may indicate that submitted tasks have |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2900 |
* ignored or suppressed interruption, or are waiting for I/O, |
7976
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2901 |
* causing this executor not to properly terminate. (See the |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2902 |
* advisory notes for class {@link ForkJoinTask} stating that |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2903 |
* tasks should not normally entail blocking operations. But if |
f273c0d04215
7005424: Resync java.util.concurrent classes with Dougs CVS - Jan 2011
dl
parents:
6674
diff
changeset
|
2904 |
* they do, they must abort them on interrupt.) |
4110 | 2905 |
* |
2906 |
* @return {@code true} if terminating but not yet terminated |
|
2907 |
*/ |
|
2908 |
public boolean isTerminating() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2909 |
int md = mode; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2910 |
return (md & STOP) != 0 && (md & TERMINATED) == 0; |
6674 | 2911 |
} |
2912 |
||
2913 |
/** |
|
4110 | 2914 |
* Returns {@code true} if this pool has been shut down. |
2915 |
* |
|
2916 |
* @return {@code true} if this pool has been shut down |
|
2917 |
*/ |
|
2918 |
public boolean isShutdown() { |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2919 |
return (mode & SHUTDOWN) != 0; |
4110 | 2920 |
} |
2921 |
||
2922 |
/** |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2923 |
* Blocks until all tasks have completed execution after a |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2924 |
* shutdown request, or the timeout occurs, or the current thread |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2925 |
* is interrupted, whichever happens first. Because the {@link |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2926 |
* #commonPool()} never terminates until program shutdown, when |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2927 |
* applied to the common pool, this method is equivalent to {@link |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2928 |
* #awaitQuiescence(long, TimeUnit)} but always returns {@code false}. |
4110 | 2929 |
* |
2930 |
* @param timeout the maximum time to wait |
|
2931 |
* @param unit the time unit of the timeout argument |
|
2932 |
* @return {@code true} if this executor terminated and |
|
2933 |
* {@code false} if the timeout elapsed before termination |
|
2934 |
* @throws InterruptedException if interrupted while waiting |
|
2935 |
*/ |
|
2936 |
public boolean awaitTermination(long timeout, TimeUnit unit) |
|
2937 |
throws InterruptedException { |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2938 |
if (Thread.interrupted()) |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2939 |
throw new InterruptedException(); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2940 |
if (this == common) { |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2941 |
awaitQuiescence(timeout, unit); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2942 |
return false; |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2943 |
} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2944 |
long nanos = unit.toNanos(timeout); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2945 |
if (isTerminated()) |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2946 |
return true; |
18790 | 2947 |
if (nanos <= 0L) |
2948 |
return false; |
|
2949 |
long deadline = System.nanoTime() + nanos; |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
2950 |
synchronized (this) { |
18790 | 2951 |
for (;;) { |
2952 |
if (isTerminated()) |
|
2953 |
return true; |
|
2954 |
if (nanos <= 0L) |
|
2955 |
return false; |
|
2956 |
long millis = TimeUnit.NANOSECONDS.toMillis(nanos); |
|
2957 |
wait(millis > 0L ? millis : 1L); |
|
2958 |
nanos = deadline - System.nanoTime(); |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
2959 |
} |
4110 | 2960 |
} |
2961 |
} |
|
2962 |
||
2963 |
/** |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2964 |
* If called by a ForkJoinTask operating in this pool, equivalent |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2965 |
* in effect to {@link ForkJoinTask#helpQuiesce}. Otherwise, |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2966 |
* waits and/or attempts to assist performing tasks until this |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2967 |
* pool {@link #isQuiescent} or the indicated timeout elapses. |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2968 |
* |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2969 |
* @param timeout the maximum time to wait |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2970 |
* @param unit the time unit of the timeout argument |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2971 |
* @return {@code true} if quiescent; {@code false} if the |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2972 |
* timeout elapsed. |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2973 |
*/ |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2974 |
public boolean awaitQuiescence(long timeout, TimeUnit unit) { |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2975 |
long nanos = unit.toNanos(timeout); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2976 |
ForkJoinWorkerThread wt; |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2977 |
Thread thread = Thread.currentThread(); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2978 |
if ((thread instanceof ForkJoinWorkerThread) && |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2979 |
(wt = (ForkJoinWorkerThread)thread).pool == this) { |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2980 |
helpQuiescePool(wt.workQueue); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2981 |
return true; |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2982 |
} |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2983 |
else { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2984 |
for (long startTime = System.nanoTime();;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2985 |
ForkJoinTask<?> t; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2986 |
if ((t = pollScan(false)) != null) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2987 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2988 |
else if (isQuiescent()) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2989 |
return true; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2990 |
else if ((System.nanoTime() - startTime) > nanos) |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2991 |
return false; |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2992 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
2993 |
Thread.yield(); // cannot block |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2994 |
} |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2995 |
} |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2996 |
} |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2997 |
|
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2998 |
/** |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
2999 |
* Waits and/or attempts to assist performing tasks indefinitely |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3000 |
* until the {@link #commonPool()} {@link #isQuiescent}. |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3001 |
*/ |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3002 |
static void quiesceCommonPool() { |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3003 |
common.awaitQuiescence(Long.MAX_VALUE, TimeUnit.NANOSECONDS); |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3004 |
} |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3005 |
|
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3006 |
/** |
4110 | 3007 |
* Interface for extending managed parallelism for tasks running |
3008 |
* in {@link ForkJoinPool}s. |
|
3009 |
* |
|
6543 | 3010 |
* <p>A {@code ManagedBlocker} provides two methods. Method |
26448 | 3011 |
* {@link #isReleasable} must return {@code true} if blocking is |
3012 |
* not necessary. Method {@link #block} blocks the current thread |
|
6543 | 3013 |
* if necessary (perhaps internally invoking {@code isReleasable} |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3014 |
* before actually blocking). These actions are performed by any |
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3015 |
* thread invoking {@link ForkJoinPool#managedBlock(ManagedBlocker)}. |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3016 |
* The unusual methods in this API accommodate synchronizers that |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3017 |
* may, but don't usually, block for long periods. Similarly, they |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3018 |
* allow more efficient internal handling of cases in which |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3019 |
* additional workers may be, but usually are not, needed to |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3020 |
* ensure sufficient parallelism. Toward this end, |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3021 |
* implementations of method {@code isReleasable} must be amenable |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3022 |
* to repeated invocation. |
4110 | 3023 |
* |
3024 |
* <p>For example, here is a ManagedBlocker based on a |
|
3025 |
* ReentrantLock: |
|
32988 | 3026 |
* <pre> {@code |
4110 | 3027 |
* class ManagedLocker implements ManagedBlocker { |
3028 |
* final ReentrantLock lock; |
|
3029 |
* boolean hasLock = false; |
|
3030 |
* ManagedLocker(ReentrantLock lock) { this.lock = lock; } |
|
3031 |
* public boolean block() { |
|
3032 |
* if (!hasLock) |
|
3033 |
* lock.lock(); |
|
3034 |
* return true; |
|
3035 |
* } |
|
3036 |
* public boolean isReleasable() { |
|
3037 |
* return hasLock || (hasLock = lock.tryLock()); |
|
3038 |
* } |
|
3039 |
* }}</pre> |
|
6543 | 3040 |
* |
3041 |
* <p>Here is a class that possibly blocks waiting for an |
|
3042 |
* item on a given queue: |
|
32988 | 3043 |
* <pre> {@code |
6543 | 3044 |
* class QueueTaker<E> implements ManagedBlocker { |
3045 |
* final BlockingQueue<E> queue; |
|
3046 |
* volatile E item = null; |
|
3047 |
* QueueTaker(BlockingQueue<E> q) { this.queue = q; } |
|
3048 |
* public boolean block() throws InterruptedException { |
|
3049 |
* if (item == null) |
|
3050 |
* item = queue.take(); |
|
3051 |
* return true; |
|
3052 |
* } |
|
3053 |
* public boolean isReleasable() { |
|
3054 |
* return item != null || (item = queue.poll()) != null; |
|
3055 |
* } |
|
3056 |
* public E getItem() { // call after pool.managedBlock completes |
|
3057 |
* return item; |
|
3058 |
* } |
|
3059 |
* }}</pre> |
|
4110 | 3060 |
*/ |
3061 |
public static interface ManagedBlocker { |
|
3062 |
/** |
|
3063 |
* Possibly blocks the current thread, for example waiting for |
|
3064 |
* a lock or condition. |
|
3065 |
* |
|
3066 |
* @return {@code true} if no additional blocking is necessary |
|
3067 |
* (i.e., if isReleasable would return true) |
|
3068 |
* @throws InterruptedException if interrupted while waiting |
|
3069 |
* (the method is not required to do so, but is allowed to) |
|
3070 |
*/ |
|
3071 |
boolean block() throws InterruptedException; |
|
3072 |
||
3073 |
/** |
|
3074 |
* Returns {@code true} if blocking is unnecessary. |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3075 |
* @return {@code true} if blocking is unnecessary |
4110 | 3076 |
*/ |
3077 |
boolean isReleasable(); |
|
3078 |
} |
|
3079 |
||
3080 |
/** |
|
26448 | 3081 |
* Runs the given possibly blocking task. When {@linkplain |
3082 |
* ForkJoinTask#inForkJoinPool() running in a ForkJoinPool}, this |
|
3083 |
* method possibly arranges for a spare thread to be activated if |
|
3084 |
* necessary to ensure sufficient parallelism while the current |
|
3085 |
* thread is blocked in {@link ManagedBlocker#block blocker.block()}. |
|
4110 | 3086 |
* |
26448 | 3087 |
* <p>This method repeatedly calls {@code blocker.isReleasable()} and |
3088 |
* {@code blocker.block()} until either method returns {@code true}. |
|
3089 |
* Every call to {@code blocker.block()} is preceded by a call to |
|
3090 |
* {@code blocker.isReleasable()} that returned {@code false}. |
|
3091 |
* |
|
3092 |
* <p>If not running in a ForkJoinPool, this method is |
|
4110 | 3093 |
* behaviorally equivalent to |
32988 | 3094 |
* <pre> {@code |
4110 | 3095 |
* while (!blocker.isReleasable()) |
3096 |
* if (blocker.block()) |
|
26448 | 3097 |
* break;}</pre> |
4110 | 3098 |
* |
26448 | 3099 |
* If running in a ForkJoinPool, the pool may first be expanded to |
3100 |
* ensure sufficient parallelism available during the call to |
|
3101 |
* {@code blocker.block()}. |
|
4110 | 3102 |
* |
26448 | 3103 |
* @param blocker the blocker task |
3104 |
* @throws InterruptedException if {@code blocker.block()} did so |
|
4110 | 3105 |
*/ |
6543 | 3106 |
public static void managedBlock(ManagedBlocker blocker) |
4110 | 3107 |
throws InterruptedException { |
26448 | 3108 |
ForkJoinPool p; |
3109 |
ForkJoinWorkerThread wt; |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3110 |
WorkQueue w; |
4110 | 3111 |
Thread t = Thread.currentThread(); |
26448 | 3112 |
if ((t instanceof ForkJoinWorkerThread) && |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3113 |
(p = (wt = (ForkJoinWorkerThread)t).pool) != null && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3114 |
(w = wt.workQueue) != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3115 |
int block; |
18790 | 3116 |
while (!blocker.isReleasable()) { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3117 |
if ((block = p.tryCompensate(w)) != 0) { |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3118 |
try { |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3119 |
do {} while (!blocker.isReleasable() && |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3120 |
!blocker.block()); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3121 |
} finally { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3122 |
CTL.getAndAdd(p, (block > 0) ? RC_UNIT : 0L); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3123 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3124 |
break; |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3125 |
} |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3126 |
} |
4110 | 3127 |
} |
6543 | 3128 |
else { |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3129 |
do {} while (!blocker.isReleasable() && |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3130 |
!blocker.block()); |
6543 | 3131 |
} |
4110 | 3132 |
} |
3133 |
||
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3134 |
/** |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3135 |
* If the given executor is a ForkJoinPool, poll and execute |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3136 |
* AsynchronousCompletionTasks from worker's queue until none are |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3137 |
* available or blocker is released. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3138 |
*/ |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3139 |
static void helpAsyncBlocker(Executor e, ManagedBlocker blocker) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3140 |
if (blocker != null && (e instanceof ForkJoinPool)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3141 |
WorkQueue w; ForkJoinWorkerThread wt; WorkQueue[] ws; int r, n; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3142 |
ForkJoinPool p = (ForkJoinPool)e; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3143 |
Thread thread = Thread.currentThread(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3144 |
if (thread instanceof ForkJoinWorkerThread && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3145 |
(wt = (ForkJoinWorkerThread)thread).pool == p) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3146 |
w = wt.workQueue; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3147 |
else if ((r = ThreadLocalRandom.getProbe()) != 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3148 |
(ws = p.workQueues) != null && (n = ws.length) > 0) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3149 |
w = ws[(n - 1) & r & SQMASK]; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3150 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3151 |
w = null; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3152 |
if (w != null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3153 |
for (;;) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3154 |
int b = w.base, s = w.top, d, al; ForkJoinTask<?>[] a; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3155 |
if ((a = w.array) != null && (d = b - s) < 0 && |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3156 |
(al = a.length) > 0) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3157 |
int index = (al - 1) & b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3158 |
ForkJoinTask<?> t = (ForkJoinTask<?>) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3159 |
QA.getAcquire(a, index); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3160 |
if (blocker.isReleasable()) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3161 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3162 |
else if (b++ == w.base) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3163 |
if (t == null) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3164 |
if (d == -1) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3165 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3166 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3167 |
else if (!(t instanceof CompletableFuture. |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3168 |
AsynchronousCompletionTask)) |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3169 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3170 |
else if (QA.compareAndSet(a, index, t, null)) { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3171 |
w.base = b; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3172 |
t.doExec(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3173 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3174 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3175 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3176 |
else |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3177 |
break; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3178 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3179 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3180 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3181 |
} |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3182 |
|
4110 | 3183 |
// AbstractExecutorService overrides. These rely on undocumented |
3184 |
// fact that ForkJoinTask.adapt returns ForkJoinTasks that also |
|
3185 |
// implement RunnableFuture. |
|
3186 |
||
3187 |
protected <T> RunnableFuture<T> newTaskFor(Runnable runnable, T value) { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3188 |
return new ForkJoinTask.AdaptedRunnable<T>(runnable, value); |
4110 | 3189 |
} |
3190 |
||
3191 |
protected <T> RunnableFuture<T> newTaskFor(Callable<T> callable) { |
|
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3192 |
return new ForkJoinTask.AdaptedCallable<T>(callable); |
4110 | 3193 |
} |
3194 |
||
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3195 |
// VarHandle mechanics |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3196 |
private static final VarHandle CTL; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3197 |
private static final VarHandle MODE; |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3198 |
private static final VarHandle QA; |
4110 | 3199 |
|
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3200 |
static { |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3201 |
try { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3202 |
MethodHandles.Lookup l = MethodHandles.lookup(); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3203 |
CTL = l.findVarHandle(ForkJoinPool.class, "ctl", long.class); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3204 |
MODE = l.findVarHandle(ForkJoinPool.class, "mode", int.class); |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3205 |
QA = MethodHandles.arrayElementVarHandle(ForkJoinTask[].class); |
32988 | 3206 |
} catch (ReflectiveOperationException e) { |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3207 |
throw new Error(e); |
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3208 |
} |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3209 |
|
32988 | 3210 |
// Reduce the risk of rare disastrous classloading in first call to |
3211 |
// LockSupport.park: https://bugs.openjdk.java.net/browse/JDK-8074773 |
|
3212 |
Class<?> ensureLoaded = LockSupport.class; |
|
3213 |
||
3214 |
int commonMaxSpares = DEFAULT_COMMON_MAX_SPARES; |
|
3215 |
try { |
|
3216 |
String p = System.getProperty |
|
3217 |
("java.util.concurrent.ForkJoinPool.common.maximumSpares"); |
|
3218 |
if (p != null) |
|
3219 |
commonMaxSpares = Integer.parseInt(p); |
|
3220 |
} catch (Exception ignore) {} |
|
3221 |
COMMON_MAX_SPARES = commonMaxSpares; |
|
3222 |
||
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3223 |
defaultForkJoinWorkerThreadFactory = |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3224 |
new DefaultForkJoinWorkerThreadFactory(); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3225 |
modifyThreadPermission = new RuntimePermission("modifyThread"); |
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3226 |
|
16049
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3227 |
common = java.security.AccessController.doPrivileged |
92a3a919d4dc
8008378: FJP.commonPool support parallelism 0, add awaitQuiescence
chegar
parents:
15002
diff
changeset
|
3228 |
(new java.security.PrivilegedAction<ForkJoinPool>() { |
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3229 |
public ForkJoinPool run() { |
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3230 |
return new ForkJoinPool((byte)0); }}); |
14914
69bfd88e3ea1
8002356: Add ForkJoin common pool and CountedCompleter
dl
parents:
11279
diff
changeset
|
3231 |
|
39723
9aa34e4a0469
8157523: Various improvements to ForkJoin/SubmissionPublisher code
dl
parents:
37782
diff
changeset
|
3232 |
COMMON_PARALLELISM = Math.max(common.mode & SMASK, 1); |
8765
dfc2a131d08a
7023006: Reduce unnecessary thread activity in ForkJoinPool
dl
parents:
7976
diff
changeset
|
3233 |
} |
4110 | 3234 |
|
22070 | 3235 |
/** |
32988 | 3236 |
* Factory for innocuous worker threads. |
22070 | 3237 |
*/ |
32988 | 3238 |
private static final class InnocuousForkJoinWorkerThreadFactory |
22070 | 3239 |
implements ForkJoinWorkerThreadFactory { |
3240 |
||
3241 |
/** |
|
3242 |
* An ACC to restrict permissions for the factory itself. |
|
3243 |
* The constructed workers have no permissions set. |
|
3244 |
*/ |
|
40817
4f5fb115676d
8164169: Miscellaneous changes imported from jsr166 CVS 2016-09
dl
parents:
40734
diff
changeset
|
3245 |
private static final AccessControlContext INNOCUOUS_ACC; |
22070 | 3246 |
static { |
3247 |
Permissions innocuousPerms = new Permissions(); |
|
3248 |
innocuousPerms.add(modifyThreadPermission); |
|
3249 |
innocuousPerms.add(new RuntimePermission( |
|
3250 |
"enableContextClassLoaderOverride")); |
|
3251 |
innocuousPerms.add(new RuntimePermission( |
|
3252 |
"modifyThreadGroup")); |
|
40817
4f5fb115676d
8164169: Miscellaneous changes imported from jsr166 CVS 2016-09
dl
parents:
40734
diff
changeset
|
3253 |
INNOCUOUS_ACC = new AccessControlContext(new ProtectionDomain[] { |
22070 | 3254 |
new ProtectionDomain(null, innocuousPerms) |
3255 |
}); |
|
3256 |
} |
|
3257 |
||
3258 |
public final ForkJoinWorkerThread newThread(ForkJoinPool pool) { |
|
32988 | 3259 |
return java.security.AccessController.doPrivileged( |
3260 |
new java.security.PrivilegedAction<ForkJoinWorkerThread>() { |
|
22070 | 3261 |
public ForkJoinWorkerThread run() { |
3262 |
return new ForkJoinWorkerThread. |
|
3263 |
InnocuousForkJoinWorkerThread(pool); |
|
40817
4f5fb115676d
8164169: Miscellaneous changes imported from jsr166 CVS 2016-09
dl
parents:
40734
diff
changeset
|
3264 |
}}, INNOCUOUS_ACC); |
22070 | 3265 |
} |
3266 |
} |
|
3267 |
||
4110 | 3268 |
} |