author | dl |
Wed, 25 Nov 2015 18:12:38 -0800 | |
changeset 34339 | 61d78c23fcdc |
parent 33674 | 566777f73c32 |
child 36936 | bfcdf736a998 |
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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* 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.atomic; |
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import java.lang.reflect.Field; |
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import java.lang.reflect.Modifier; |
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import java.security.AccessController; |
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import java.security.PrivilegedActionException; |
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import java.security.PrivilegedExceptionAction; |
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import java.util.function.IntBinaryOperator; |
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import java.util.function.IntUnaryOperator; |
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import sun.reflect.CallerSensitive; |
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import sun.reflect.Reflection; |
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/** |
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* A reflection-based utility that enables atomic updates to |
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* designated {@code volatile int} fields of designated classes. |
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* This class is designed for use in atomic data structures in which |
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* several fields of the same node are independently subject to atomic |
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* updates. |
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* |
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* <p>Note that the guarantees of the {@code compareAndSet} |
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* method in this class are weaker than in other atomic classes. |
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* Because this class cannot ensure that all uses of the field |
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* are appropriate for purposes of atomic access, it can |
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* guarantee atomicity only with respect to other invocations of |
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* {@code compareAndSet} and {@code set} on the same updater. |
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* |
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* @since 1.5 |
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* @author Doug Lea |
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* @param <T> The type of the object holding the updatable field |
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*/ |
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public abstract class AtomicIntegerFieldUpdater<T> { |
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/** |
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* Creates and returns an updater for objects with the given field. |
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* The Class argument is needed to check that reflective types and |
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* generic types match. |
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* |
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* @param tclass the class of the objects holding the field |
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* @param fieldName the name of the field to be updated |
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* @param <U> the type of instances of tclass |
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* @return the updater |
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* @throws IllegalArgumentException if the field is not a |
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* volatile integer type |
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* @throws RuntimeException with a nested reflection-based |
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* exception if the class does not hold field or is the wrong type, |
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* or the field is inaccessible to the caller according to Java language |
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* access control |
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*/ |
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@CallerSensitive |
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public static <U> AtomicIntegerFieldUpdater<U> newUpdater(Class<U> tclass, |
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String fieldName) { |
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return new AtomicIntegerFieldUpdaterImpl<U> |
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(tclass, fieldName, Reflection.getCallerClass()); |
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} |
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/** |
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* Protected do-nothing constructor for use by subclasses. |
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*/ |
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protected AtomicIntegerFieldUpdater() { |
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} |
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/** |
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* Atomically sets the field of the given object managed by this updater |
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* to the given updated value if the current value {@code ==} the |
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* expected value. This method is guaranteed to be atomic with respect to |
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* other calls to {@code compareAndSet} and {@code set}, but not |
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* necessarily with respect to other changes in the field. |
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* |
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* @param obj An object whose field to conditionally set |
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* @param expect the expected value |
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* @param update the new value |
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* @return {@code true} if successful |
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* @throws ClassCastException if {@code obj} is not an instance |
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* of the class possessing the field established in the constructor |
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*/ |
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public abstract boolean compareAndSet(T obj, int expect, int update); |
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/** |
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* Atomically sets the field of the given object managed by this updater |
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* to the given updated value if the current value {@code ==} the |
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* expected value. This method is guaranteed to be atomic with respect to |
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* other calls to {@code compareAndSet} and {@code set}, but not |
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* necessarily with respect to other changes in the field. |
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* |
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* <p><a href="package-summary.html#weakCompareAndSet">May fail |
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* spuriously and does not provide ordering guarantees</a>, so is |
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* only rarely an appropriate alternative to {@code compareAndSet}. |
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* |
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* @param obj An object whose field to conditionally set |
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* @param expect the expected value |
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* @param update the new value |
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* @return {@code true} if successful |
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* @throws ClassCastException if {@code obj} is not an instance |
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* of the class possessing the field established in the constructor |
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*/ |
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public abstract boolean weakCompareAndSet(T obj, int expect, int update); |
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/** |
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* Sets the field of the given object managed by this updater to the |
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* given updated value. This operation is guaranteed to act as a volatile |
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* store with respect to subsequent invocations of {@code compareAndSet}. |
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* |
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* @param obj An object whose field to set |
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* @param newValue the new value |
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*/ |
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public abstract void set(T obj, int newValue); |
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/** |
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* Eventually sets the field of the given object managed by this |
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* updater to the given updated value. |
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* |
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* @param obj An object whose field to set |
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* @param newValue the new value |
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* @since 1.6 |
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*/ |
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public abstract void lazySet(T obj, int newValue); |
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/** |
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* Gets the current value held in the field of the given object managed |
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* by this updater. |
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* |
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* @param obj An object whose field to get |
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* @return the current value |
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*/ |
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public abstract int get(T obj); |
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/** |
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* Atomically sets the field of the given object managed by this updater |
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* to the given value and returns the old value. |
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* |
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* @param obj An object whose field to get and set |
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* @param newValue the new value |
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* @return the previous value |
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*/ |
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public int getAndSet(T obj, int newValue) { |
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int prev; |
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do { |
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prev = get(obj); |
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} while (!compareAndSet(obj, prev, newValue)); |
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return prev; |
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} |
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/** |
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* Atomically increments by one the current value of the field of the |
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* given object managed by this updater. |
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* |
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* @param obj An object whose field to get and set |
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* @return the previous value |
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*/ |
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public int getAndIncrement(T obj) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev + 1; |
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} while (!compareAndSet(obj, prev, next)); |
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return prev; |
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} |
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/** |
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* Atomically decrements by one the current value of the field of the |
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* given object managed by this updater. |
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* |
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* @param obj An object whose field to get and set |
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* @return the previous value |
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*/ |
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public int getAndDecrement(T obj) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev - 1; |
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} while (!compareAndSet(obj, prev, next)); |
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return prev; |
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} |
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/** |
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* Atomically adds the given value to the current value of the field of |
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* the given object managed by this updater. |
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* |
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* @param obj An object whose field to get and set |
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* @param delta the value to add |
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* @return the previous value |
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*/ |
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public int getAndAdd(T obj, int delta) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev + delta; |
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} while (!compareAndSet(obj, prev, next)); |
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return prev; |
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} |
225 |
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/** |
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* Atomically increments by one the current value of the field of the |
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* given object managed by this updater. |
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* |
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* @param obj An object whose field to get and set |
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* @return the updated value |
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*/ |
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public int incrementAndGet(T obj) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev + 1; |
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} while (!compareAndSet(obj, prev, next)); |
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return next; |
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} |
241 |
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/** |
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* Atomically decrements by one the current value of the field of the |
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* given object managed by this updater. |
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* |
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* @param obj An object whose field to get and set |
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* @return the updated value |
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*/ |
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public int decrementAndGet(T obj) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev - 1; |
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} while (!compareAndSet(obj, prev, next)); |
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return next; |
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} |
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||
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/** |
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* Atomically adds the given value to the current value of the field of |
|
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* the given object managed by this updater. |
|
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* |
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262 |
* @param obj An object whose field to get and set |
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263 |
* @param delta the value to add |
|
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* @return the updated value |
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*/ |
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public int addAndGet(T obj, int delta) { |
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int prev, next; |
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do { |
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prev = get(obj); |
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next = prev + delta; |
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} while (!compareAndSet(obj, prev, next)); |
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return next; |
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} |
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||
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/** |
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* Atomically updates the field of the given object managed by this updater |
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* with the results of applying the given function, returning the previous |
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* value. The function should be side-effect-free, since it may be |
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* re-applied when attempted updates fail due to contention among threads. |
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* |
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* @param obj An object whose field to get and set |
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* @param updateFunction a side-effect-free function |
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* @return the previous value |
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284 |
* @since 1.8 |
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285 |
*/ |
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286 |
public final int getAndUpdate(T obj, IntUnaryOperator updateFunction) { |
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int prev, next; |
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288 |
do { |
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prev = get(obj); |
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next = updateFunction.applyAsInt(prev); |
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} while (!compareAndSet(obj, prev, next)); |
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return prev; |
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293 |
} |
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294 |
|
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295 |
/** |
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296 |
* Atomically updates the field of the given object managed by this updater |
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297 |
* with the results of applying the given function, returning the updated |
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298 |
* value. The function should be side-effect-free, since it may be |
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* re-applied when attempted updates fail due to contention among threads. |
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* |
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301 |
* @param obj An object whose field to get and set |
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302 |
* @param updateFunction a side-effect-free function |
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303 |
* @return the updated value |
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304 |
* @since 1.8 |
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305 |
*/ |
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306 |
public final int updateAndGet(T obj, IntUnaryOperator updateFunction) { |
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307 |
int prev, next; |
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308 |
do { |
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309 |
prev = get(obj); |
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next = updateFunction.applyAsInt(prev); |
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311 |
} while (!compareAndSet(obj, prev, next)); |
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312 |
return next; |
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313 |
} |
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314 |
|
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315 |
/** |
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316 |
* Atomically updates the field of the given object managed by this |
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317 |
* updater with the results of applying the given function to the |
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|
318 |
* current and given values, returning the previous value. The |
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319 |
* function should be side-effect-free, since it may be re-applied |
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320 |
* when attempted updates fail due to contention among threads. The |
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321 |
* function is applied with the current value as its first argument, |
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322 |
* and the given update as the second argument. |
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323 |
* |
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324 |
* @param obj An object whose field to get and set |
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325 |
* @param x the update value |
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326 |
* @param accumulatorFunction a side-effect-free function of two arguments |
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327 |
* @return the previous value |
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|
328 |
* @since 1.8 |
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|
329 |
*/ |
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|
330 |
public final int getAndAccumulate(T obj, int x, |
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331 |
IntBinaryOperator accumulatorFunction) { |
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|
332 |
int prev, next; |
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|
333 |
do { |
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|
334 |
prev = get(obj); |
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335 |
next = accumulatorFunction.applyAsInt(prev, x); |
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336 |
} while (!compareAndSet(obj, prev, next)); |
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337 |
return prev; |
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338 |
} |
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|
339 |
|
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|
340 |
/** |
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|
341 |
* Atomically updates the field of the given object managed by this |
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342 |
* updater with the results of applying the given function to the |
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|
343 |
* current and given values, returning the updated value. The |
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344 |
* function should be side-effect-free, since it may be re-applied |
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|
345 |
* when attempted updates fail due to contention among threads. The |
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346 |
* function is applied with the current value as its first argument, |
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347 |
* and the given update as the second argument. |
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348 |
* |
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349 |
* @param obj An object whose field to get and set |
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350 |
* @param x the update value |
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351 |
* @param accumulatorFunction a side-effect-free function of two arguments |
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|
352 |
* @return the updated value |
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353 |
* @since 1.8 |
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|
354 |
*/ |
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|
355 |
public final int accumulateAndGet(T obj, int x, |
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|
356 |
IntBinaryOperator accumulatorFunction) { |
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|
357 |
int prev, next; |
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|
358 |
do { |
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|
359 |
prev = get(obj); |
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360 |
next = accumulatorFunction.applyAsInt(prev, x); |
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|
361 |
} while (!compareAndSet(obj, prev, next)); |
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|
362 |
return next; |
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|
363 |
} |
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|
364 |
|
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|
365 |
/** |
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366 |
* Standard hotspot implementation using intrinsics. |
2 | 367 |
*/ |
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368 |
private static final class AtomicIntegerFieldUpdaterImpl<T> |
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369 |
extends AtomicIntegerFieldUpdater<T> { |
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370 |
private static final jdk.internal.misc.Unsafe U = jdk.internal.misc.Unsafe.getUnsafe(); |
2 | 371 |
private final long offset; |
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372 |
/** |
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373 |
* if field is protected, the subclass constructing updater, else |
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374 |
* the same as tclass |
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375 |
*/ |
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376 |
private final Class<?> cclass; |
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377 |
/** class holding the field */ |
2 | 378 |
private final Class<T> tclass; |
379 |
||
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380 |
AtomicIntegerFieldUpdaterImpl(final Class<T> tclass, |
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381 |
final String fieldName, |
18576 | 382 |
final Class<?> caller) { |
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383 |
final Field field; |
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384 |
final int modifiers; |
2 | 385 |
try { |
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386 |
field = AccessController.doPrivileged( |
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|
387 |
new PrivilegedExceptionAction<Field>() { |
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|
388 |
public Field run() throws NoSuchFieldException { |
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|
389 |
return tclass.getDeclaredField(fieldName); |
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390 |
} |
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|
391 |
}); |
2 | 392 |
modifiers = field.getModifiers(); |
393 |
sun.reflect.misc.ReflectUtil.ensureMemberAccess( |
|
394 |
caller, tclass, null, modifiers); |
|
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395 |
ClassLoader cl = tclass.getClassLoader(); |
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396 |
ClassLoader ccl = caller.getClassLoader(); |
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397 |
if ((ccl != null) && (ccl != cl) && |
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398 |
((cl == null) || !isAncestor(cl, ccl))) { |
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399 |
sun.reflect.misc.ReflectUtil.checkPackageAccess(tclass); |
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400 |
} |
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401 |
} catch (PrivilegedActionException pae) { |
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|
402 |
throw new RuntimeException(pae.getException()); |
7518 | 403 |
} catch (Exception ex) { |
2 | 404 |
throw new RuntimeException(ex); |
405 |
} |
|
406 |
||
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|
407 |
if (field.getType() != int.class) |
2 | 408 |
throw new IllegalArgumentException("Must be integer type"); |
409 |
||
410 |
if (!Modifier.isVolatile(modifiers)) |
|
411 |
throw new IllegalArgumentException("Must be volatile type"); |
|
412 |
||
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|
413 |
this.cclass = (Modifier.isProtected(modifiers)) ? caller : tclass; |
2 | 414 |
this.tclass = tclass; |
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|
415 |
this.offset = U.objectFieldOffset(field); |
2 | 416 |
} |
417 |
||
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418 |
/** |
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419 |
* Returns true if the second classloader can be found in the first |
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420 |
* classloader's delegation chain. |
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421 |
* Equivalent to the inaccessible: first.isAncestor(second). |
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422 |
*/ |
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423 |
private static boolean isAncestor(ClassLoader first, ClassLoader second) { |
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424 |
ClassLoader acl = first; |
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425 |
do { |
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|
426 |
acl = acl.getParent(); |
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|
427 |
if (second == acl) { |
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|
428 |
return true; |
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|
429 |
} |
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|
430 |
} while (acl != null); |
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|
431 |
return false; |
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|
432 |
} |
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|
433 |
|
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434 |
/** |
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|
435 |
* Checks that target argument is instance of cclass. On |
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|
436 |
* failure, throws cause. |
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|
437 |
*/ |
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|
438 |
private final void accessCheck(T obj) { |
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|
439 |
if (!cclass.isInstance(obj)) |
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|
440 |
throwAccessCheckException(obj); |
2 | 441 |
} |
442 |
||
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443 |
/** |
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|
444 |
* Throws access exception if accessCheck failed due to |
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|
445 |
* protected access, else ClassCastException. |
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|
446 |
*/ |
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|
447 |
private final void throwAccessCheckException(T obj) { |
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|
448 |
if (cclass == tclass) |
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|
449 |
throw new ClassCastException(); |
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|
450 |
else |
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|
451 |
throw new RuntimeException( |
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|
452 |
new IllegalAccessException( |
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|
453 |
"Class " + |
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|
454 |
cclass.getName() + |
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|
455 |
" can not access a protected member of class " + |
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|
456 |
tclass.getName() + |
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|
457 |
" using an instance of " + |
61d78c23fcdc
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changeset
|
458 |
obj.getClass().getName())); |
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|
459 |
} |
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|
460 |
|
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|
461 |
public final boolean compareAndSet(T obj, int expect, int update) { |
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|
462 |
accessCheck(obj); |
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|
463 |
return U.compareAndSwapInt(obj, offset, expect, update); |
2 | 464 |
} |
465 |
||
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|
466 |
public final boolean weakCompareAndSet(T obj, int expect, int update) { |
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|
467 |
accessCheck(obj); |
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|
468 |
return U.compareAndSwapInt(obj, offset, expect, update); |
2 | 469 |
} |
470 |
||
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|
471 |
public final void set(T obj, int newValue) { |
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|
472 |
accessCheck(obj); |
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|
473 |
U.putIntVolatile(obj, offset, newValue); |
2 | 474 |
} |
475 |
||
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|
476 |
public final void lazySet(T obj, int newValue) { |
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|
477 |
accessCheck(obj); |
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|
478 |
U.putOrderedInt(obj, offset, newValue); |
2 | 479 |
} |
480 |
||
481 |
public final int get(T obj) { |
|
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|
482 |
accessCheck(obj); |
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|
483 |
return U.getIntVolatile(obj, offset); |
2 | 484 |
} |
485 |
||
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|
486 |
public final int getAndSet(T obj, int newValue) { |
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|
487 |
accessCheck(obj); |
32838
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|
488 |
return U.getAndSetInt(obj, offset, newValue); |
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|
489 |
} |
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changeset
|
490 |
|
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|
491 |
public final int getAndAdd(T obj, int delta) { |
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|
492 |
accessCheck(obj); |
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|
493 |
return U.getAndAddInt(obj, offset, delta); |
15020
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|
494 |
} |
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changeset
|
495 |
|
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|
496 |
public final int getAndIncrement(T obj) { |
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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changeset
|
497 |
return getAndAdd(obj, 1); |
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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changeset
|
498 |
} |
61d78c23fcdc
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parents:
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changeset
|
499 |
|
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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changeset
|
500 |
public final int getAndDecrement(T obj) { |
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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parents:
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diff
changeset
|
501 |
return getAndAdd(obj, -1); |
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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changeset
|
502 |
} |
61d78c23fcdc
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parents:
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changeset
|
503 |
|
61d78c23fcdc
8140587: Atomic*FieldUpdaters should use Class.isInstance instead of direct class check
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changeset
|
504 |
public final int incrementAndGet(T obj) { |
15020
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|
505 |
return getAndAdd(obj, 1) + 1; |
50394fa17c1b
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changeset
|
506 |
} |
50394fa17c1b
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changeset
|
507 |
|
34339
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changeset
|
508 |
public final int decrementAndGet(T obj) { |
32838
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changeset
|
509 |
return getAndAdd(obj, -1) - 1; |
15020
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chegar
parents:
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diff
changeset
|
510 |
} |
50394fa17c1b
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chegar
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diff
changeset
|
511 |
|
34339
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changeset
|
512 |
public final int addAndGet(T obj, int delta) { |
15020
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chegar
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changeset
|
513 |
return getAndAdd(obj, delta) + delta; |
50394fa17c1b
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diff
changeset
|
514 |
} |
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|
515 |
|
2 | 516 |
} |
517 |
} |