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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.invoke.MethodHandles; |
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import java.lang.invoke.VarHandle; |
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import java.util.function.BinaryOperator; |
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import java.util.function.UnaryOperator; |
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/** |
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* An object reference that may be updated atomically. See the {@link |
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* VarHandle} specification for descriptions of the properties of |
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* atomic accesses. |
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* @since 1.5 |
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* @author Doug Lea |
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* @param <V> The type of object referred to by this reference |
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*/ |
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public class AtomicReference<V> implements java.io.Serializable { |
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private static final long serialVersionUID = -1848883965231344442L; |
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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(AtomicReference.class, "value", Object.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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private volatile V value; |
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/** |
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* Creates a new AtomicReference with the given initial value. |
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* |
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* @param initialValue the initial value |
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*/ |
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public AtomicReference(V initialValue) { |
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value = initialValue; |
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} |
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* Creates a new AtomicReference with null initial value. |
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*/ |
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public AtomicReference() { |
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} |
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/** |
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* Returns the current value, |
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* with memory effects as specified by {@link VarHandle#getVolatile}. |
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* |
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* @return the current value |
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*/ |
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public final V get() { |
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return value; |
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} |
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/** |
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* Sets the value to {@code newValue}, |
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* with memory effects as specified by {@link VarHandle#setVolatile}. |
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* |
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* @param newValue the new value |
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*/ |
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public final void set(V newValue) { |
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value = newValue; |
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} |
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/** |
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* Sets the value to {@code newValue}, |
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* with memory effects as specified by {@link VarHandle#setRelease}. |
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* |
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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 final void lazySet(V newValue) { |
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VALUE.setRelease(this, newValue); |
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} |
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/** |
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* Atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by {@link VarHandle#compareAndSet}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful. False return indicates that |
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* the actual value was not equal to the expected value. |
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*/ |
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public final boolean compareAndSet(V expectedValue, V newValue) { |
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return VALUE.compareAndSet(this, expectedValue, newValue); |
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} |
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/** |
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* Possibly atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by {@link VarHandle#weakCompareAndSetPlain}. |
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* |
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* @deprecated This method has plain memory effects but the method |
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* name implies volatile memory effects (see methods such as |
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* {@link #compareAndExchange} and {@link #compareAndSet}). To avoid |
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* confusion over plain or volatile memory effects it is recommended that |
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* the method {@link #weakCompareAndSetPlain} be used instead. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful |
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* @see #weakCompareAndSetPlain |
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*/ |
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@Deprecated(since="9") |
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public final boolean weakCompareAndSet(V expectedValue, V newValue) { |
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return VALUE.weakCompareAndSetPlain(this, expectedValue, newValue); |
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} |
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/** |
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* Possibly atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by {@link VarHandle#weakCompareAndSetPlain}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful |
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* @since 9 |
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*/ |
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public final boolean weakCompareAndSetPlain(V expectedValue, V newValue) { |
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return VALUE.weakCompareAndSetPlain(this, expectedValue, newValue); |
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} |
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/** |
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* Atomically sets the value to {@code newValue} and returns the old value, |
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* with memory effects as specified by {@link VarHandle#getAndSet}. |
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* |
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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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@SuppressWarnings("unchecked") |
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public final V getAndSet(V newValue) { |
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return (V)VALUE.getAndSet(this, newValue); |
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} |
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/** |
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* Atomically updates (with memory effects as specified by {@link |
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* VarHandle#compareAndSet}) the current value with the results of |
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* applying the given function, returning the previous value. The |
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* function should be side-effect-free, since it may be re-applied |
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* when attempted updates fail due to contention among threads. |
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* |
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* @param updateFunction a side-effect-free function |
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* @return the previous value |
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* @since 1.8 |
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*/ |
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public final V getAndUpdate(UnaryOperator<V> updateFunction) { |
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V prev = get(), next = null; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = updateFunction.apply(prev); |
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if (weakCompareAndSetVolatile(prev, next)) |
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return prev; |
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haveNext = (prev == (prev = get())); |
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} |
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} |
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/** |
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* Atomically updates (with memory effects as specified by {@link |
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* VarHandle#compareAndSet}) the current value with the results of |
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* applying the given function, returning the updated value. The |
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* when attempted updates fail due to contention among threads. |
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* |
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* @param updateFunction a side-effect-free function |
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* @return the updated value |
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* @since 1.8 |
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public final V updateAndGet(UnaryOperator<V> updateFunction) { |
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V prev = get(), next = null; |
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if (!haveNext) |
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next = updateFunction.apply(prev); |
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if (weakCompareAndSetVolatile(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 (with memory effects as specified by {@link |
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* VarHandle#compareAndSet}) the current value with the results of |
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* applying the given function to the current and given values, |
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* returning the previous value. The function should be |
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* side-effect-free, since it may be re-applied when attempted |
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* updates fail due to contention among threads. The function is |
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* applied with the current value as its first argument, and the |
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* given update as the second argument. |
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* |
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* @param x the update value |
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* @param accumulatorFunction a side-effect-free function of two arguments |
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* @return the previous value |
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* @since 1.8 |
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*/ |
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public final V getAndAccumulate(V x, |
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BinaryOperator<V> accumulatorFunction) { |
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V prev = get(), next = null; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = accumulatorFunction.apply(prev, x); |
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if (weakCompareAndSetVolatile(prev, next)) |
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return prev; |
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haveNext = (prev == (prev = get())); |
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} |
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} |
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|
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/** |
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* Atomically updates (with memory effects as specified by {@link |
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* VarHandle#compareAndSet}) the current value with the results of |
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* applying the given function to the current and given values, |
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* returning the updated value. The function should be |
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* side-effect-free, since it may be re-applied when attempted |
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* updates fail due to contention among threads. The function is |
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* applied with the current value as its first argument, and the |
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* given update as the second argument. |
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* |
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* @param x the update value |
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* @param accumulatorFunction a side-effect-free function of two arguments |
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* @return the updated value |
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* @since 1.8 |
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*/ |
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public final V accumulateAndGet(V x, |
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BinaryOperator<V> accumulatorFunction) { |
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V prev = get(), next = null; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = accumulatorFunction.apply(prev, x); |
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if (weakCompareAndSetVolatile(prev, next)) |
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return next; |
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haveNext = (prev == (prev = get())); |
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} |
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} |
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|
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/** |
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* Returns the String representation of the current value. |
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* @return the String representation of the current value |
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*/ |
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public String toString() { |
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} |
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||
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// jdk9 |
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|
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/** |
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* Returns the current value, with memory semantics of reading as |
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* if the variable was declared non-{@code volatile}. |
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* |
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* @return the value |
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* @since 9 |
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*/ |
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public final V getPlain() { |
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return (V)VALUE.get(this); |
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} |
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|
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/** |
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* Sets the value to {@code newValue}, with memory semantics |
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* of setting as if the variable was declared non-{@code volatile} |
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* and non-{@code final}. |
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* |
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* @param newValue the new value |
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* @since 9 |
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*/ |
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public final void setPlain(V newValue) { |
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VALUE.set(this, newValue); |
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} |
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|
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/** |
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* Returns the current value, |
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* with memory effects as specified by {@link VarHandle#getOpaque}. |
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* |
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* @return the value |
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* @since 9 |
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*/ |
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public final V getOpaque() { |
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return (V)VALUE.getOpaque(this); |
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} |
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|
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/** |
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* Sets the value to {@code newValue}, |
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* with memory effects as specified by {@link VarHandle#setOpaque}. |
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* |
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* @param newValue the new value |
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* @since 9 |
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*/ |
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public final void setOpaque(V newValue) { |
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VALUE.setOpaque(this, newValue); |
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} |
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/** |
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* Returns the current value, |
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* with memory effects as specified by {@link VarHandle#getAcquire}. |
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* |
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* @return the value |
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* @since 9 |
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*/ |
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public final V getAcquire() { |
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return (V)VALUE.getAcquire(this); |
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} |
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|
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/** |
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* Sets the value to {@code newValue}, |
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* with memory effects as specified by {@link VarHandle#setRelease}. |
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* |
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* @param newValue the new value |
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* @since 9 |
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*/ |
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public final void setRelease(V newValue) { |
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VALUE.setRelease(this, newValue); |
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} |
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|
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/** |
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* Atomically sets the value to {@code newValue} if the current value, |
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* referred to as the <em>witness value</em>, {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#compareAndExchange}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return the witness value, which will be the same as the |
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* expected value if successful |
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* @since 9 |
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*/ |
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public final V compareAndExchange(V expectedValue, V newValue) { |
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return (V)VALUE.compareAndExchange(this, expectedValue, newValue); |
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} |
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|
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/** |
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* Atomically sets the value to {@code newValue} if the current value, |
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* referred to as the <em>witness value</em>, {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#compareAndExchangeAcquire}. |
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* |
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369 |
* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return the witness value, which will be the same as the |
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* expected value if successful |
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* @since 9 |
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*/ |
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375 |
public final V compareAndExchangeAcquire(V expectedValue, V newValue) { |
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return (V)VALUE.compareAndExchangeAcquire(this, expectedValue, newValue); |
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} |
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|
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/** |
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* Atomically sets the value to {@code newValue} if the current value, |
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* referred to as the <em>witness value</em>, {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#compareAndExchangeRelease}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return the witness value, which will be the same as the |
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* expected value if successful |
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* @since 9 |
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*/ |
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391 |
public final V compareAndExchangeRelease(V expectedValue, V newValue) { |
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return (V)VALUE.compareAndExchangeRelease(this, expectedValue, newValue); |
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} |
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|
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/** |
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* Possibly atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#weakCompareAndSet}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful |
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* @since 9 |
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*/ |
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public final boolean weakCompareAndSetVolatile(V expectedValue, V newValue) { |
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return VALUE.weakCompareAndSet(this, expectedValue, newValue); |
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} |
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|
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* Possibly atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#weakCompareAndSetAcquire}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful |
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* @since 9 |
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*/ |
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public final boolean weakCompareAndSetAcquire(V expectedValue, V newValue) { |
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return VALUE.weakCompareAndSetAcquire(this, expectedValue, newValue); |
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} |
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|
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/** |
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* Possibly atomically sets the value to {@code newValue} |
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* if the current value {@code == expectedValue}, |
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* with memory effects as specified by |
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* {@link VarHandle#weakCompareAndSetRelease}. |
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* |
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* @param expectedValue the expected value |
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* @param newValue the new value |
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* @return {@code true} if successful |
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* @since 9 |
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*/ |
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public final boolean weakCompareAndSetRelease(V expectedValue, V newValue) { |
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return VALUE.weakCompareAndSetRelease(this, expectedValue, newValue); |
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} |
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|
2 | 440 |
} |