author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 45637 | jdk/src/java.base/share/classes/java/util/concurrent/atomic/AtomicLongArray.java@9e0c80381e32 |
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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.LongBinaryOperator; |
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import java.util.function.LongUnaryOperator; |
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/** |
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* A {@code long} array in which elements may be updated atomically. |
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* See the {@link VarHandle} specification for descriptions of the |
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* properties of atomic accesses. |
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* @since 1.5 |
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* @author Doug Lea |
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*/ |
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public class AtomicLongArray implements java.io.Serializable { |
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private static final long serialVersionUID = -2308431214976778248L; |
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private static final VarHandle AA |
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= MethodHandles.arrayElementVarHandle(long[].class); |
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private final long[] array; |
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/** |
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* Creates a new AtomicLongArray of the given length, with all |
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* elements initially zero. |
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* @param length the length of the array |
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*/ |
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public AtomicLongArray(int length) { |
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array = new long[length]; |
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} |
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/** |
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* Creates a new AtomicLongArray with the same length as, and |
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* all elements copied from, the given array. |
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* |
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* @param array the array to copy elements from |
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* @throws NullPointerException if array is null |
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*/ |
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public AtomicLongArray(long[] array) { |
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// Visibility guaranteed by final field guarantees |
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this.array = array.clone(); |
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} |
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/** |
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* Returns the length of the array. |
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* |
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* @return the length of the array |
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*/ |
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public final int length() { |
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return array.length; |
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} |
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/** |
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* Returns the current value of the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getVolatile}. |
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* |
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* @param i the index |
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* @return the current value |
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*/ |
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public final long get(int i) { |
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return (long)AA.getVolatile(array, i); |
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} |
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/** |
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* Sets the element at index {@code i} 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 i the index |
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* @param newValue the new value |
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*/ |
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public final void set(int i, long newValue) { |
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AA.setVolatile(array, i, newValue); |
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} |
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/** |
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* Sets the element at index {@code i} 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 i the index |
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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(int i, long newValue) { |
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AA.setRelease(array, i, newValue); |
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} |
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/** |
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* Atomically sets the element at index {@code i} to {@code |
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* 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 i the index |
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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 final long getAndSet(int i, long newValue) { |
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return (long)AA.getAndSet(array, i, newValue); |
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} |
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/** |
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* Atomically sets the element at index {@code i} to {@code newValue} |
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* if the element's 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 i the index |
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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(int i, long expectedValue, long newValue) { |
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return AA.compareAndSet(array, i, expectedValue, newValue); |
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} |
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/** |
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* Possibly atomically sets the element at index {@code i} to |
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* {@code newValue} if the element's 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 i the index |
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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(int i, long expectedValue, long newValue) { |
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return AA.weakCompareAndSetPlain(array, i, expectedValue, newValue); |
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} |
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/** |
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* Possibly atomically sets the element at index {@code i} to |
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* {@code newValue} if the element's 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 i the index |
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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(int i, long expectedValue, long newValue) { |
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return AA.weakCompareAndSetPlain(array, i, expectedValue, newValue); |
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} |
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/** |
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* Atomically increments the value of the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* <p>Equivalent to {@code getAndAdd(i, 1)}. |
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* |
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* @param i the index |
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* @return the previous value |
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*/ |
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public final long getAndIncrement(int i) { |
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return (long)AA.getAndAdd(array, i, 1L); |
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} |
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/** |
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* Atomically decrements the value of the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* <p>Equivalent to {@code getAndAdd(i, -1)}. |
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* |
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* @param i the index |
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* @return the previous value |
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*/ |
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public final long getAndDecrement(int i) { |
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return (long)AA.getAndAdd(array, i, -1L); |
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} |
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/** |
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* Atomically adds the given value to the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* @param i the index |
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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 final long getAndAdd(int i, long delta) { |
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return (long)AA.getAndAdd(array, i, delta); |
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} |
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/** |
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* Atomically increments the value of the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* <p>Equivalent to {@code addAndGet(i, 1)}. |
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* |
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* @param i the index |
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* @return the updated value |
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*/ |
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public final long incrementAndGet(int i) { |
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return (long)AA.getAndAdd(array, i, 1L) + 1L; |
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} |
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* Atomically decrements the value of the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* <p>Equivalent to {@code addAndGet(i, -1)}. |
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* |
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* @param i the index |
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* @return the updated value |
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public final long decrementAndGet(int i) { |
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return (long)AA.getAndAdd(array, i, -1L) - 1L; |
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} |
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* Atomically adds the given value to the element at index {@code i}, |
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* with memory effects as specified by {@link VarHandle#getAndAdd}. |
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* |
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* @param delta the value to add |
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* @return the updated value |
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return (long)AA.getAndAdd(array, i, delta) + delta; |
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} |
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* Atomically updates (with memory effects as specified by {@link |
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* VarHandle#compareAndSet}) the element at index {@code i} with |
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* the results of applying the given function, returning the |
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* previous value. The function should be side-effect-free, since |
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* it may be re-applied when attempted updates fail due to |
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* contention among threads. |
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* |
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* @param i the index |
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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 long getAndUpdate(int i, LongUnaryOperator updateFunction) { |
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long prev = get(i), next = 0L; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = updateFunction.applyAsLong(prev); |
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if (weakCompareAndSetVolatile(i, prev, next)) |
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return prev; |
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haveNext = (prev == (prev = get(i))); |
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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 element at index {@code i} with |
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* the results of applying the given function, returning the |
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* updated value. The function should be side-effect-free, since it |
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* may be re-applied when attempted updates fail due to contention |
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* among threads. |
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* |
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* @param i the index |
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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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*/ |
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public final long updateAndGet(int i, LongUnaryOperator updateFunction) { |
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long prev = get(i), next = 0L; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = updateFunction.applyAsLong(prev); |
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if (weakCompareAndSetVolatile(i, prev, next)) |
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return next; |
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haveNext = (prev == (prev = get(i))); |
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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 element at index {@code i} with |
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* the results of applying the given function to the current and |
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* given values, returning the previous value. The function should |
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* be 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 of the element at index {@code i} |
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* as its first argument, and the given update as the second |
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* argument. |
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* |
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* @param i the index |
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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 long getAndAccumulate(int i, long x, |
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LongBinaryOperator accumulatorFunction) { |
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long prev = get(i), next = 0L; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = accumulatorFunction.applyAsLong(prev, x); |
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if (weakCompareAndSetVolatile(i, prev, next)) |
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return prev; |
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haveNext = (prev == (prev = get(i))); |
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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 element at index {@code i} with |
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* the results of applying the given function to the current and |
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* given values, returning the updated value. The function should |
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* be 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 of the element at index {@code i} |
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* as its first argument, and the given update as the second |
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* argument. |
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* |
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* @param i the index |
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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 long accumulateAndGet(int i, long x, |
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LongBinaryOperator accumulatorFunction) { |
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long prev = get(i), next = 0L; |
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for (boolean haveNext = false;;) { |
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if (!haveNext) |
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next = accumulatorFunction.applyAsLong(prev, x); |
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return next; |
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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 values of array. |
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* @return the String representation of the current values of array |
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*/ |
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public String toString() { |
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int iMax = array.length - 1; |
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if (iMax == -1) |
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return "[]"; |
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StringBuilder b = new StringBuilder(); |
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378 |
b.append('['); |
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379 |
for (int i = 0; ; i++) { |
39725
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380 |
b.append(get(i)); |
7976
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381 |
if (i == iMax) |
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382 |
return b.append(']').toString(); |
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383 |
b.append(',').append(' '); |
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384 |
} |
2 | 385 |
} |
386 |
||
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387 |
// jdk9 |
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388 |
|
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389 |
/** |
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|
390 |
* Returns the current value of the element at index {@code i}, |
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391 |
* with memory semantics of reading as if the variable was declared |
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* non-{@code volatile}. |
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393 |
* |
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394 |
* @param i the index |
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395 |
* @return the value |
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396 |
* @since 9 |
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|
397 |
*/ |
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398 |
public final long getPlain(int i) { |
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|
399 |
return (long)AA.get(array, i); |
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400 |
} |
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|
401 |
|
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402 |
/** |
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|
403 |
* Sets the element at index {@code i} to {@code newValue}, |
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404 |
* with memory semantics of setting as if the variable was |
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405 |
* declared non-{@code volatile} and non-{@code final}. |
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|
406 |
* |
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|
407 |
* @param i the index |
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|
408 |
* @param newValue the new value |
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|
409 |
* @since 9 |
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|
410 |
*/ |
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|
411 |
public final void setPlain(int i, long newValue) { |
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|
412 |
AA.set(array, i, newValue); |
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413 |
} |
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|
414 |
|
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415 |
/** |
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416 |
* Returns the current value of the element at index {@code i}, |
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417 |
* with memory effects as specified by {@link VarHandle#getOpaque}. |
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418 |
* |
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|
419 |
* @param i the index |
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|
420 |
* @return the value |
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|
421 |
* @since 9 |
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|
422 |
*/ |
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|
423 |
public final long getOpaque(int i) { |
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|
424 |
return (long)AA.getOpaque(array, i); |
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|
425 |
} |
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|
426 |
|
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|
427 |
/** |
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|
428 |
* Sets the element at index {@code i} to {@code newValue}, |
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|
429 |
* with memory effects as specified by {@link VarHandle#setOpaque}. |
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|
430 |
* |
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|
431 |
* @param i the index |
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|
432 |
* @param newValue the new value |
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|
433 |
* @since 9 |
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|
434 |
*/ |
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|
435 |
public final void setOpaque(int i, long newValue) { |
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|
436 |
AA.setOpaque(array, i, newValue); |
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|
437 |
} |
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|
438 |
|
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|
439 |
/** |
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|
440 |
* Returns the current value of the element at index {@code i}, |
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|
441 |
* with memory effects as specified by {@link VarHandle#getAcquire}. |
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|
442 |
* |
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|
443 |
* @param i the index |
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|
444 |
* @return the value |
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|
445 |
* @since 9 |
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|
446 |
*/ |
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|
447 |
public final long getAcquire(int i) { |
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|
448 |
return (long)AA.getAcquire(array, i); |
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|
449 |
} |
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|
450 |
|
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|
451 |
/** |
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|
452 |
* Sets the element at index {@code i} to {@code newValue}, |
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|
453 |
* with memory effects as specified by {@link VarHandle#setRelease}. |
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|
454 |
* |
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|
455 |
* @param i the index |
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|
456 |
* @param newValue the new value |
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|
457 |
* @since 9 |
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|
458 |
*/ |
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|
459 |
public final void setRelease(int i, long newValue) { |
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|
460 |
AA.setRelease(array, i, newValue); |
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|
461 |
} |
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|
462 |
|
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|
463 |
/** |
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|
464 |
* Atomically sets the element at index {@code i} to {@code newValue} |
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|
465 |
* if the element's current value, referred to as the <em>witness |
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|
466 |
* value</em>, {@code == expectedValue}, |
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|
467 |
* with memory effects as specified by |
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|
468 |
* {@link VarHandle#compareAndExchange}. |
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|
469 |
* |
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|
470 |
* @param i the index |
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|
471 |
* @param expectedValue the expected value |
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|
472 |
* @param newValue the new value |
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|
473 |
* @return the witness value, which will be the same as the |
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|
474 |
* expected value if successful |
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|
475 |
* @since 9 |
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|
476 |
*/ |
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|
477 |
public final long compareAndExchange(int i, long expectedValue, long newValue) { |
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|
478 |
return (long)AA.compareAndExchange(array, i, expectedValue, newValue); |
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|
479 |
} |
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|
480 |
|
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|
481 |
/** |
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|
482 |
* Atomically sets the element at index {@code i} to {@code newValue} |
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|
483 |
* if the element's current value, referred to as the <em>witness |
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|
484 |
* value</em>, {@code == expectedValue}, |
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|
485 |
* with memory effects as specified by |
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|
486 |
* {@link VarHandle#compareAndExchangeAcquire}. |
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|
487 |
* |
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|
488 |
* @param i the index |
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|
489 |
* @param expectedValue the expected value |
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|
490 |
* @param newValue the new value |
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|
491 |
* @return the witness value, which will be the same as the |
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|
492 |
* expected value if successful |
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|
493 |
* @since 9 |
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|
494 |
*/ |
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|
495 |
public final long compareAndExchangeAcquire(int i, long expectedValue, long newValue) { |
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|
496 |
return (long)AA.compareAndExchangeAcquire(array, i, expectedValue, newValue); |
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|
497 |
} |
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|
498 |
|
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|
499 |
/** |
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|
500 |
* Atomically sets the element at index {@code i} to {@code newValue} |
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|
501 |
* if the element's current value, referred to as the <em>witness |
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|
502 |
* value</em>, {@code == expectedValue}, |
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|
503 |
* with memory effects as specified by |
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|
504 |
* {@link VarHandle#compareAndExchangeRelease}. |
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|
505 |
* |
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|
506 |
* @param i the index |
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|
507 |
* @param expectedValue the expected value |
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|
508 |
* @param newValue the new value |
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* @return the witness value, which will be the same as the |
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510 |
* expected value if successful |
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511 |
* @since 9 |
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512 |
*/ |
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513 |
public final long compareAndExchangeRelease(int i, long expectedValue, long newValue) { |
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return (long)AA.compareAndExchangeRelease(array, i, expectedValue, newValue); |
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8080603: Replace Unsafe with VarHandle in java.util.concurrent classes
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} |
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516 |
|
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517 |
/** |
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518 |
* Possibly atomically sets the element at index {@code i} to |
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519 |
* {@code newValue} if the element's 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 i the index |
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524 |
* @param expectedValue the expected value |
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525 |
* @param newValue the new value |
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526 |
* @return {@code true} if successful |
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527 |
* @since 9 |
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528 |
*/ |
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529 |
public final boolean weakCompareAndSetVolatile(int i, long expectedValue, long newValue) { |
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return AA.weakCompareAndSet(array, i, expectedValue, newValue); |
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531 |
} |
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532 |
|
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533 |
/** |
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* Possibly atomically sets the element at index {@code i} to |
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535 |
* {@code newValue} if the element's current value {@code == expectedValue}, |
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536 |
* with memory effects as specified by |
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537 |
* {@link VarHandle#weakCompareAndSetAcquire}. |
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538 |
* |
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539 |
* @param i the index |
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540 |
* @param expectedValue the expected value |
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541 |
* @param newValue the new value |
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* @return {@code true} if successful |
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543 |
* @since 9 |
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544 |
*/ |
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545 |
public final boolean weakCompareAndSetAcquire(int i, long expectedValue, long newValue) { |
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546 |
return AA.weakCompareAndSetAcquire(array, i, expectedValue, newValue); |
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547 |
} |
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548 |
|
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|
549 |
/** |
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550 |
* Possibly atomically sets the element at index {@code i} to |
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551 |
* {@code newValue} if the element's current value {@code == expectedValue}, |
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552 |
* with memory effects as specified by |
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* {@link VarHandle#weakCompareAndSetRelease}. |
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* |
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* @param i the index |
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556 |
* @param expectedValue the expected value |
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557 |
* @param newValue the new value |
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558 |
* @return {@code true} if successful |
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559 |
* @since 9 |
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560 |
*/ |
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561 |
public final boolean weakCompareAndSetRelease(int i, long expectedValue, long newValue) { |
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|
562 |
return AA.weakCompareAndSetRelease(array, i, expectedValue, newValue); |
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563 |
} |
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564 |
|
2 | 565 |
} |