author | psandoz |
Thu, 19 Jan 2017 09:27:24 -0800 | |
changeset 43219 | 566b551b7820 |
parent 39725 | 9548f8d846e9 |
permissions | -rw-r--r-- |
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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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/* |
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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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|
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package java.util.concurrent.atomic; |
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import java.lang.invoke.MethodHandles; |
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import java.lang.invoke.VarHandle; |
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import java.util.Arrays; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.function.DoubleBinaryOperator; |
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import java.util.function.LongBinaryOperator; |
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/** |
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* A package-local class holding common representation and mechanics |
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* for classes supporting dynamic striping on 64bit values. The class |
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* extends Number so that concrete subclasses must publicly do so. |
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*/ |
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@SuppressWarnings("serial") |
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abstract class Striped64 extends Number { |
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/* |
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* This class maintains a lazily-initialized table of atomically |
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* updated variables, plus an extra "base" field. The table size |
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* is a power of two. Indexing uses masked per-thread hash codes. |
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* Nearly all declarations in this class are package-private, |
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* accessed directly by subclasses. |
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* |
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* Table entries are of class Cell; a variant of AtomicLong padded |
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* (via @Contended) to reduce cache contention. Padding is |
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* overkill for most Atomics because they are usually irregularly |
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* scattered in memory and thus don't interfere much with each |
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* other. But Atomic objects residing in arrays will tend to be |
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* placed adjacent to each other, and so will most often share |
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* cache lines (with a huge negative performance impact) without |
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* this precaution. |
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* |
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* In part because Cells are relatively large, we avoid creating |
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* them until they are needed. When there is no contention, all |
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* updates are made to the base field. Upon first contention (a |
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* failed CAS on base update), the table is initialized to size 2. |
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* The table size is doubled upon further contention until |
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* reaching the nearest power of two greater than or equal to the |
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* number of CPUS. Table slots remain empty (null) until they are |
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* needed. |
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* |
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* A single spinlock ("cellsBusy") is used for initializing and |
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* resizing the table, as well as populating slots with new Cells. |
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* There is no need for a blocking lock; when the lock is not |
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* available, threads try other slots (or the base). During these |
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* retries, there is increased contention and reduced locality, |
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* which is still better than alternatives. |
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* |
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* The Thread probe fields maintained via ThreadLocalRandom serve |
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* as per-thread hash codes. We let them remain uninitialized as |
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* zero (if they come in this way) until they contend at slot |
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* 0. They are then initialized to values that typically do not |
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* often conflict with others. Contention and/or table collisions |
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* are indicated by failed CASes when performing an update |
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* operation. Upon a collision, if the table size is less than |
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* the capacity, it is doubled in size unless some other thread |
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* holds the lock. If a hashed slot is empty, and lock is |
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* available, a new Cell is created. Otherwise, if the slot |
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* exists, a CAS is tried. Retries proceed by "double hashing", |
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* using a secondary hash (Marsaglia XorShift) to try to find a |
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* free slot. |
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* |
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* The table size is capped because, when there are more threads |
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* than CPUs, supposing that each thread were bound to a CPU, |
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* there would exist a perfect hash function mapping threads to |
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* slots that eliminates collisions. When we reach capacity, we |
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* search for this mapping by randomly varying the hash codes of |
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* colliding threads. Because search is random, and collisions |
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* only become known via CAS failures, convergence can be slow, |
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* and because threads are typically not bound to CPUS forever, |
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* may not occur at all. However, despite these limitations, |
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* observed contention rates are typically low in these cases. |
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* |
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* It is possible for a Cell to become unused when threads that |
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* once hashed to it terminate, as well as in the case where |
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* doubling the table causes no thread to hash to it under |
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* expanded mask. We do not try to detect or remove such cells, |
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* under the assumption that for long-running instances, observed |
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* contention levels will recur, so the cells will eventually be |
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* needed again; and for short-lived ones, it does not matter. |
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*/ |
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|
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/** |
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* Padded variant of AtomicLong supporting only raw accesses plus CAS. |
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* |
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* JVM intrinsics note: It would be possible to use a release-only |
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* form of CAS here, if it were provided. |
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*/ |
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@jdk.internal.vm.annotation.Contended static final class Cell { |
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volatile long value; |
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Cell(long x) { value = x; } |
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final boolean cas(long cmp, long val) { |
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return VALUE.compareAndSet(this, cmp, val); |
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} |
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final void reset() { |
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VALUE.setVolatile(this, 0L); |
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} |
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final void reset(long identity) { |
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VALUE.setVolatile(this, identity); |
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} |
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// VarHandle mechanics |
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private static final VarHandle VALUE; |
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static { |
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try { |
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MethodHandles.Lookup l = MethodHandles.lookup(); |
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VALUE = l.findVarHandle(Cell.class, "value", long.class); |
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} catch (ReflectiveOperationException e) { |
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throw new Error(e); |
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} |
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} |
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} |
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/** Number of CPUS, to place bound on table size */ |
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static final int NCPU = Runtime.getRuntime().availableProcessors(); |
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|
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/** |
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* Table of cells. When non-null, size is a power of 2. |
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*/ |
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transient volatile Cell[] cells; |
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|
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/** |
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* Base value, used mainly when there is no contention, but also as |
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* a fallback during table initialization races. Updated via CAS. |
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*/ |
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transient volatile long base; |
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|
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/** |
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* Spinlock (locked via CAS) used when resizing and/or creating Cells. |
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*/ |
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transient volatile int cellsBusy; |
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|
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/** |
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* Package-private default constructor. |
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*/ |
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Striped64() { |
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} |
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|
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/** |
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* CASes the base field. |
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*/ |
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final boolean casBase(long cmp, long val) { |
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return BASE.compareAndSet(this, cmp, val); |
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} |
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|
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/** |
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* CASes the cellsBusy field from 0 to 1 to acquire lock. |
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*/ |
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final boolean casCellsBusy() { |
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return CELLSBUSY.compareAndSet(this, 0, 1); |
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} |
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|
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/** |
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* Returns the probe value for the current thread. |
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* Duplicated from ThreadLocalRandom because of packaging restrictions. |
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*/ |
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static final int getProbe() { |
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return (int) THREAD_PROBE.get(Thread.currentThread()); |
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} |
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|
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/** |
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* Pseudo-randomly advances and records the given probe value for the |
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* given thread. |
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* Duplicated from ThreadLocalRandom because of packaging restrictions. |
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*/ |
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static final int advanceProbe(int probe) { |
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probe ^= probe << 13; // xorshift |
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probe ^= probe >>> 17; |
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probe ^= probe << 5; |
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THREAD_PROBE.set(Thread.currentThread(), probe); |
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return probe; |
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} |
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|
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/** |
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* Handles cases of updates involving initialization, resizing, |
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* creating new Cells, and/or contention. See above for |
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* explanation. This method suffers the usual non-modularity |
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* problems of optimistic retry code, relying on rechecked sets of |
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* reads. |
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* |
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* @param x the value |
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* @param fn the update function, or null for add (this convention |
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* avoids the need for an extra field or function in LongAdder). |
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* @param wasUncontended false if CAS failed before call |
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*/ |
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final void longAccumulate(long x, LongBinaryOperator fn, |
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boolean wasUncontended) { |
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int h; |
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if ((h = getProbe()) == 0) { |
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ThreadLocalRandom.current(); // force initialization |
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h = getProbe(); |
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wasUncontended = true; |
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} |
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boolean collide = false; // True if last slot nonempty |
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230 |
done: for (;;) { |
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231 |
Cell[] as; Cell a; int n; long v; |
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|
232 |
if ((as = cells) != null && (n = as.length) > 0) { |
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|
233 |
if ((a = as[(n - 1) & h]) == null) { |
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|
234 |
if (cellsBusy == 0) { // Try to attach new Cell |
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|
235 |
Cell r = new Cell(x); // Optimistically create |
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|
236 |
if (cellsBusy == 0 && casCellsBusy()) { |
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parents:
diff
changeset
|
237 |
try { // Recheck under lock |
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parents:
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changeset
|
238 |
Cell[] rs; int m, j; |
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parents:
diff
changeset
|
239 |
if ((rs = cells) != null && |
e331a847ff27
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parents:
diff
changeset
|
240 |
(m = rs.length) > 0 && |
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parents:
diff
changeset
|
241 |
rs[j = (m - 1) & h] == null) { |
e331a847ff27
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changeset
|
242 |
rs[j] = r; |
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changeset
|
243 |
break done; |
15283
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parents:
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changeset
|
244 |
} |
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changeset
|
245 |
} finally { |
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changeset
|
246 |
cellsBusy = 0; |
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parents:
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changeset
|
247 |
} |
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parents:
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changeset
|
248 |
continue; // Slot is now non-empty |
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|
249 |
} |
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|
250 |
} |
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parents:
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changeset
|
251 |
collide = false; |
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changeset
|
252 |
} |
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parents:
diff
changeset
|
253 |
else if (!wasUncontended) // CAS already known to fail |
e331a847ff27
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dl
parents:
diff
changeset
|
254 |
wasUncontended = true; // Continue after rehash |
32838
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changeset
|
255 |
else if (a.cas(v = a.value, |
caeef2c79243
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|
256 |
(fn == null) ? v + x : fn.applyAsLong(v, x))) |
15283
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parents:
diff
changeset
|
257 |
break; |
e331a847ff27
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dl
parents:
diff
changeset
|
258 |
else if (n >= NCPU || cells != as) |
e331a847ff27
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changeset
|
259 |
collide = false; // At max size or stale |
e331a847ff27
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changeset
|
260 |
else if (!collide) |
e331a847ff27
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parents:
diff
changeset
|
261 |
collide = true; |
e331a847ff27
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dl
parents:
diff
changeset
|
262 |
else if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
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dl
parents:
diff
changeset
|
263 |
try { |
32838
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changeset
|
264 |
if (cells == as) // Expand table unless stale |
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|
265 |
cells = Arrays.copyOf(as, n << 1); |
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changeset
|
266 |
} finally { |
e331a847ff27
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parents:
diff
changeset
|
267 |
cellsBusy = 0; |
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parents:
diff
changeset
|
268 |
} |
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parents:
diff
changeset
|
269 |
collide = false; |
e331a847ff27
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dl
parents:
diff
changeset
|
270 |
continue; // Retry with expanded table |
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parents:
diff
changeset
|
271 |
} |
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parents:
diff
changeset
|
272 |
h = advanceProbe(h); |
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parents:
diff
changeset
|
273 |
} |
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parents:
diff
changeset
|
274 |
else if (cellsBusy == 0 && cells == as && casCellsBusy()) { |
e331a847ff27
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dl
parents:
diff
changeset
|
275 |
try { // Initialize table |
e331a847ff27
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dl
parents:
diff
changeset
|
276 |
if (cells == as) { |
e331a847ff27
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dl
parents:
diff
changeset
|
277 |
Cell[] rs = new Cell[2]; |
e331a847ff27
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dl
parents:
diff
changeset
|
278 |
rs[h & 1] = new Cell(x); |
e331a847ff27
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dl
parents:
diff
changeset
|
279 |
cells = rs; |
32838
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8134854: Bulk integration of java.util.concurrent.atomic classes
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parents:
25859
diff
changeset
|
280 |
break done; |
15283
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8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
281 |
} |
e331a847ff27
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dl
parents:
diff
changeset
|
282 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
283 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
284 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
285 |
} |
32838
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8134854: Bulk integration of java.util.concurrent.atomic classes
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parents:
25859
diff
changeset
|
286 |
// Fall back on using base |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
287 |
else if (casBase(v = base, |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
288 |
(fn == null) ? v + x : fn.applyAsLong(v, x))) |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
289 |
break done; |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
290 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
291 |
} |
e331a847ff27
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dl
parents:
diff
changeset
|
292 |
|
32838
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dl
parents:
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diff
changeset
|
293 |
private static long apply(DoubleBinaryOperator fn, long v, double x) { |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
294 |
double d = Double.longBitsToDouble(v); |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
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diff
changeset
|
295 |
d = (fn == null) ? d + x : fn.applyAsDouble(d, x); |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
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diff
changeset
|
296 |
return Double.doubleToRawLongBits(d); |
caeef2c79243
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dl
parents:
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diff
changeset
|
297 |
} |
caeef2c79243
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dl
parents:
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diff
changeset
|
298 |
|
15283
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dl
parents:
diff
changeset
|
299 |
/** |
e331a847ff27
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dl
parents:
diff
changeset
|
300 |
* Same as longAccumulate, but injecting long/double conversions |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
301 |
* in too many places to sensibly merge with long version, given |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
302 |
* the low-overhead requirements of this class. So must instead be |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
303 |
* maintained by copy/paste/adapt. |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
304 |
*/ |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
305 |
final void doubleAccumulate(double x, DoubleBinaryOperator fn, |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
306 |
boolean wasUncontended) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
307 |
int h; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
308 |
if ((h = getProbe()) == 0) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
309 |
ThreadLocalRandom.current(); // force initialization |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
310 |
h = getProbe(); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
311 |
wasUncontended = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
312 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
313 |
boolean collide = false; // True if last slot nonempty |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
314 |
done: for (;;) { |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
315 |
Cell[] as; Cell a; int n; long v; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
316 |
if ((as = cells) != null && (n = as.length) > 0) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
317 |
if ((a = as[(n - 1) & h]) == null) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
318 |
if (cellsBusy == 0) { // Try to attach new Cell |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
319 |
Cell r = new Cell(Double.doubleToRawLongBits(x)); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
320 |
if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
321 |
try { // Recheck under lock |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
322 |
Cell[] rs; int m, j; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
323 |
if ((rs = cells) != null && |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
324 |
(m = rs.length) > 0 && |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
325 |
rs[j = (m - 1) & h] == null) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
326 |
rs[j] = r; |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
327 |
break done; |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
328 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
329 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
330 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
331 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
332 |
continue; // Slot is now non-empty |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
333 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
334 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
335 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
336 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
337 |
else if (!wasUncontended) // CAS already known to fail |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
338 |
wasUncontended = true; // Continue after rehash |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
339 |
else if (a.cas(v = a.value, apply(fn, v, x))) |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
340 |
break; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
341 |
else if (n >= NCPU || cells != as) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
342 |
collide = false; // At max size or stale |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
343 |
else if (!collide) |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
344 |
collide = true; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
345 |
else if (cellsBusy == 0 && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
346 |
try { |
32838
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8134854: Bulk integration of java.util.concurrent.atomic classes
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changeset
|
347 |
if (cells == as) // Expand table unless stale |
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8134854: Bulk integration of java.util.concurrent.atomic classes
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|
348 |
cells = Arrays.copyOf(as, n << 1); |
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parents:
diff
changeset
|
349 |
} finally { |
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8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
350 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
351 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
352 |
collide = false; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
353 |
continue; // Retry with expanded table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
354 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
355 |
h = advanceProbe(h); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
356 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
357 |
else if (cellsBusy == 0 && cells == as && casCellsBusy()) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
358 |
try { // Initialize table |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
359 |
if (cells == as) { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
360 |
Cell[] rs = new Cell[2]; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
361 |
rs[h & 1] = new Cell(Double.doubleToRawLongBits(x)); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
362 |
cells = rs; |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
363 |
break done; |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
364 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
365 |
} finally { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
366 |
cellsBusy = 0; |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
367 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
368 |
} |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
369 |
// Fall back on using base |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
370 |
else if (casBase(v = base, apply(fn, v, x))) |
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
371 |
break done; |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
372 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
373 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
374 |
|
43219
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
375 |
// VarHandle mechanics |
39725
9548f8d846e9
8080603: Replace Unsafe with VarHandle in java.util.concurrent classes
dl
parents:
35981
diff
changeset
|
376 |
private static final VarHandle BASE; |
9548f8d846e9
8080603: Replace Unsafe with VarHandle in java.util.concurrent classes
dl
parents:
35981
diff
changeset
|
377 |
private static final VarHandle CELLSBUSY; |
43219
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
378 |
private static final VarHandle THREAD_PROBE; |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
379 |
static { |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
380 |
try { |
39725
9548f8d846e9
8080603: Replace Unsafe with VarHandle in java.util.concurrent classes
dl
parents:
35981
diff
changeset
|
381 |
MethodHandles.Lookup l = MethodHandles.lookup(); |
43219
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
382 |
BASE = l.findVarHandle(Striped64.class, |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
383 |
"base", long.class); |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
384 |
CELLSBUSY = l.findVarHandle(Striped64.class, |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
385 |
"cellsBusy", int.class); |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
386 |
l = java.security.AccessController.doPrivileged( |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
387 |
new java.security.PrivilegedAction<>() { |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
388 |
public MethodHandles.Lookup run() { |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
389 |
try { |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
390 |
return MethodHandles.privateLookupIn(Thread.class, MethodHandles.lookup()); |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
391 |
} catch (ReflectiveOperationException e) { |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
392 |
throw new Error(e); |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
393 |
} |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
394 |
}}); |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
395 |
THREAD_PROBE = l.findVarHandle(Thread.class, |
566b551b7820
8160710: Enable Thread to grant VarHandle field access to ThreadLocalRandom/Striped64
psandoz
parents:
39725
diff
changeset
|
396 |
"threadLocalRandomProbe", int.class); |
32838
caeef2c79243
8134854: Bulk integration of java.util.concurrent.atomic classes
dl
parents:
25859
diff
changeset
|
397 |
} catch (ReflectiveOperationException e) { |
15283
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
398 |
throw new Error(e); |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
399 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
400 |
} |
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
401 |
|
e331a847ff27
8005311: Add Scalable Updatable Variables, DoubleAccumulator, DoubleAdder, LongAccumulator, LongAdder
dl
parents:
diff
changeset
|
402 |
} |