1adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/* 229957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 329957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 429957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * This code is free software; you can redistribute it and/or modify it 529957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * under the terms of the GNU General Public License version 2 only, as 629957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * published by the Free Software Foundation. Oracle designates this 729957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * particular file as subject to the "Classpath" exception as provided 829957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * by Oracle in the LICENSE file that accompanied this code. 929957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 1029957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * This code is distributed in the hope that it will be useful, but WITHOUT 1129957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1229957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1329957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * version 2 for more details (a copy is included in the LICENSE file that 1429957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * accompanied this code). 1529957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 1629957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * You should have received a copy of the GNU General Public License version 1729957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 2 along with this work; if not, write to the Free Software Foundation, 1829957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1929957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 2029957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2129957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * or visit www.oracle.com if you need additional information or have any 2229957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * questions. 2329957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer */ 2429957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer 2529957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer/* 2629957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * This file is available under and governed by the GNU General Public 2729957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * License version 2 only, as published by the Free Software Foundation. 2829957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * However, the following notice accompanied the original version of this 2929957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * file: 3029957558cf0db700bfaae360a80c42dc3871d0e5Tobias Thierer * 31adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Written by Doug Lea with assistance from members of JCP JSR-166 32adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Expert Group and released to the public domain, as explained at 33a807b4d808d2591894daf13aab179b2e9c46a2f5Jesse Wilson * http://creativecommons.org/publicdomain/zero/1.0/ 34adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 35adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 36adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpackage java.util.concurrent.atomic; 377365de1056414750d0a7d1fdd26025fd247f0d04Jesse Wilson 386975f84c2ed72e1e26d20190b6f318718c849008Tobias Thiererimport dalvik.system.VMStack; // Android-added 3991770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravleimport java.lang.reflect.Field; 4091770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravleimport java.lang.reflect.Modifier; 41edf43d27e240d82106f39ae91404963c23987234Narayan Kamathimport java.security.AccessController; 42ed4f365789d43b1961657195df223a19bf4ef20fPrzemyslaw Szczepaniakimport java.security.PrivilegedActionException; 43b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniakimport java.security.PrivilegedExceptionAction; 44b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniakimport java.util.function.IntBinaryOperator; 45b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniakimport java.util.function.IntUnaryOperator; 46b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniakimport sun.reflect.CallerSensitive; 47b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniakimport sun.reflect.Reflection; 48adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 49adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/** 50adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * A reflection-based utility that enables atomic updates to 51bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * designated {@code volatile int} fields of designated classes. 52adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This class is designed for use in atomic data structures in which 53adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * several fields of the same node are independently subject to atomic 54adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * updates. 55adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 56bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * <p>Note that the guarantees of the {@code compareAndSet} 57bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * method in this class are weaker than in other atomic classes. 58bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Because this class cannot ensure that all uses of the field 59bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * are appropriate for purposes of atomic access, it can 60bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * guarantee atomicity only with respect to other invocations of 61bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * {@code compareAndSet} and {@code set} on the same updater. 62bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 63adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @since 1.5 64adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @author Doug Lea 65adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param <T> The type of the object holding the updatable field 66adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 6791770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravlepublic abstract class AtomicIntegerFieldUpdater<T> { 68adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 69bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Creates and returns an updater for objects with the given field. 70bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * The Class argument is needed to check that reflective types and 71bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * generic types match. 72bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 73adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param tclass the class of the objects holding the field 74bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @param fieldName the name of the field to be updated 75fd81a99407d318ea3d8b5782294a0644e580d126Neil Fuller * @param <U> the type of instances of tclass 76adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the updater 77adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IllegalArgumentException if the field is not a 78bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * volatile integer type 79adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws RuntimeException with a nested reflection-based 8091770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * exception if the class does not hold field or is the wrong type, 8191770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * or the field is inaccessible to the caller according to Java language 8291770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * access control 83adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 84b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak @CallerSensitive 85b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public static <U> AtomicIntegerFieldUpdater<U> newUpdater(Class<U> tclass, 86b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak String fieldName) { 87b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return new AtomicIntegerFieldUpdaterImpl<U> 886975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer (tclass, fieldName, VMStack.getStackClass1()); // Android-changed 89adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 90adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 91adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 92adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Protected do-nothing constructor for use by subclasses. 93adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 94adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected AtomicIntegerFieldUpdater() { 95adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 96adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 97adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 98bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically sets the field of the given object managed by this updater 99bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * to the given updated value if the current value {@code ==} the 100bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * expected value. This method is guaranteed to be atomic with respect to 101bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * other calls to {@code compareAndSet} and {@code set}, but not 102bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * necessarily with respect to other changes in the field. 103bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 104adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to conditionally set 105adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param expect the expected value 106adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param update the new value 107b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return {@code true} if successful 108bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @throws ClassCastException if {@code obj} is not an instance 109bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * of the class possessing the field established in the constructor 110adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public abstract boolean compareAndSet(T obj, int expect, int update); 112adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 113adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 114bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically sets the field of the given object managed by this updater 115bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * to the given updated value if the current value {@code ==} the 116bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * expected value. This method is guaranteed to be atomic with respect to 117bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * other calls to {@code compareAndSet} and {@code set}, but not 118bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * necessarily with respect to other changes in the field. 119bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 12091770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * <p><a href="package-summary.html#weakCompareAndSet">May fail 12191770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * spuriously and does not provide ordering guarantees</a>, so is 12291770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle * only rarely an appropriate alternative to {@code compareAndSet}. 123bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 124adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to conditionally set 125adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param expect the expected value 126adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param update the new value 127b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return {@code true} if successful 128bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @throws ClassCastException if {@code obj} is not an instance 129bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * of the class possessing the field established in the constructor 130adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 131adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public abstract boolean weakCompareAndSet(T obj, int expect, int update); 132adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 133adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 134bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Sets the field of the given object managed by this updater to the 135bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * given updated value. This operation is guaranteed to act as a volatile 136bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * store with respect to subsequent invocations of {@code compareAndSet}. 137bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 138adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to set 139adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param newValue the new value 140adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 141adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public abstract void set(T obj, int newValue); 142adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 143adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 1446232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * Eventually sets the field of the given object managed by this 1456232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * updater to the given updated value. 1466232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * 1476232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * @param obj An object whose field to set 1486232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * @param newValue the new value 1496232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson * @since 1.6 1506232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson */ 1516232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson public abstract void lazySet(T obj, int newValue); 1526232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson 1536232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson /** 154bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Gets the current value held in the field of the given object managed 155bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * by this updater. 156bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 157adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get 158adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the current value 159adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 160adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public abstract int get(T obj); 161adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 162adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 163bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically sets the field of the given object managed by this updater 164bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * to the given value and returns the old value. 165adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * 166adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 167adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param newValue the new value 168adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the previous value 169adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 170adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int getAndSet(T obj, int newValue) { 171b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev; 172b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 173b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 174b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, newValue)); 175b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 176adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 177adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 178adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 179bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically increments by one the current value of the field of the 180bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * given object managed by this updater. 181bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 182adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 183bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the previous value 184adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 185adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int getAndIncrement(T obj) { 186b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 187b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 188b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 189b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev + 1; 190b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 191b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 192adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 193adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 194adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 195bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically decrements by one the current value of the field of the 196bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * given object managed by this updater. 197bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 198adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 199bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the previous value 200adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 201adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int getAndDecrement(T obj) { 202b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 203b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 204b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 205b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev - 1; 206b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 207b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 208adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 209adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 210adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 211bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically adds the given value to the current value of the field of 212bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * the given object managed by this updater. 213bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 214adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 215adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param delta the value to add 216bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the previous value 217adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 218adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int getAndAdd(T obj, int delta) { 219b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 220b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 221b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 222b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev + delta; 223b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 224b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 225adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 226adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 227adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 228bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically increments by one the current value of the field of the 229bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * given object managed by this updater. 230bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 231adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 232bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the updated value 233adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 234adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int incrementAndGet(T obj) { 235b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 236b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 237b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 238b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev + 1; 239b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 240b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return next; 241adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 242adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 243adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 244bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically decrements by one the current value of the field of the 245bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * given object managed by this updater. 246bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 247adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 248bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the updated value 249adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 250adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int decrementAndGet(T obj) { 251b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 252b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 253b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 254b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev - 1; 255b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 256b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return next; 257adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 258adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 259adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 260bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * Atomically adds the given value to the current value of the field of 261bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * the given object managed by this updater. 262bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * 263adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param obj An object whose field to get and set 264adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param delta the value to add 265bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson * @return the updated value 266adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 267adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int addAndGet(T obj, int delta) { 268b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 269b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 270b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 271b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = prev + delta; 272b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 273b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return next; 2745328e07d282bef36ac8b757bbee16a761415b2c4Przemyslaw Szczepaniak } 2755328e07d282bef36ac8b757bbee16a761415b2c4Przemyslaw Szczepaniak 2765328e07d282bef36ac8b757bbee16a761415b2c4Przemyslaw Szczepaniak /** 277b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Atomically updates the field of the given object managed by this updater 278b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * with the results of applying the given function, returning the previous 279b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * value. The function should be side-effect-free, since it may be 280b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * re-applied when attempted updates fail due to contention among threads. 281b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * 282b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param obj An object whose field to get and set 283b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param updateFunction a side-effect-free function 284b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return the previous value 285b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @since 1.8 2865328e07d282bef36ac8b757bbee16a761415b2c4Przemyslaw Szczepaniak */ 287b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndUpdate(T obj, IntUnaryOperator updateFunction) { 288b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 289b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 290b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 291b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = updateFunction.applyAsInt(prev); 292b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 293b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 294b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 295b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 296b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 297b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Atomically updates the field of the given object managed by this updater 298b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * with the results of applying the given function, returning the updated 299b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * value. The function should be side-effect-free, since it may be 300b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * re-applied when attempted updates fail due to contention among threads. 301b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * 302b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param obj An object whose field to get and set 303b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param updateFunction a side-effect-free function 304b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return the updated value 305b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @since 1.8 306b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 307b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int updateAndGet(T obj, IntUnaryOperator updateFunction) { 308b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 309b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 310b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 311b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = updateFunction.applyAsInt(prev); 312b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 313b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return next; 314b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 315b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 316b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 317b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Atomically updates the field of the given object managed by this 318b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * updater with the results of applying the given function to the 319b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * current and given values, returning the previous value. The 320b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * function should be side-effect-free, since it may be re-applied 321b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * when attempted updates fail due to contention among threads. The 322b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * function is applied with the current value as its first argument, 323b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * and the given update as the second argument. 324b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * 325b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param obj An object whose field to get and set 326b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param x the update value 327b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param accumulatorFunction a side-effect-free function of two arguments 328b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return the previous value 329b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @since 1.8 330b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 331b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndAccumulate(T obj, int x, 332b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak IntBinaryOperator accumulatorFunction) { 333b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 334b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 335b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 336b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = accumulatorFunction.applyAsInt(prev, x); 337b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 338b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return prev; 339b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 340b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 341b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 342b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Atomically updates the field of the given object managed by this 343b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * updater with the results of applying the given function to the 344b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * current and given values, returning the updated value. The 345b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * function should be side-effect-free, since it may be re-applied 346b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * when attempted updates fail due to contention among threads. The 347b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * function is applied with the current value as its first argument, 348b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * and the given update as the second argument. 349b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * 350b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param obj An object whose field to get and set 351b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param x the update value 352b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @param accumulatorFunction a side-effect-free function of two arguments 353b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @return the updated value 354b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * @since 1.8 355b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 356b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int accumulateAndGet(T obj, int x, 357b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak IntBinaryOperator accumulatorFunction) { 358b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak int prev, next; 359b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak do { 360b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak prev = get(obj); 361b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak next = accumulatorFunction.applyAsInt(prev, x); 362b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } while (!compareAndSet(obj, prev, next)); 363b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return next; 364b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 365b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 366b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 367b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Standard hotspot implementation using intrinsics. 368b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 369b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak private static final class AtomicIntegerFieldUpdaterImpl<T> 370b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak extends AtomicIntegerFieldUpdater<T> { 371b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak private static final sun.misc.Unsafe U = sun.misc.Unsafe.getUnsafe(); 372adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project private final long offset; 373b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 374b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * if field is protected, the subclass constructing updater, else 375b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * the same as tclass 376b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 377ed4f365789d43b1961657195df223a19bf4ef20fPrzemyslaw Szczepaniak private final Class<?> cclass; 378b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** class holding the field */ 379b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak private final Class<T> tclass; 380adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 381b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak AtomicIntegerFieldUpdaterImpl(final Class<T> tclass, 382b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak final String fieldName, 383b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak final Class<?> caller) { 38491770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle final Field field; 38591770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle final int modifiers; 386adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project try { 387b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak field = AccessController.doPrivileged( 388b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak new PrivilegedExceptionAction<Field>() { 389b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public Field run() throws NoSuchFieldException { 390b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return tclass.getDeclaredField(fieldName); 391b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 392b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak }); 39391770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle modifiers = field.getModifiers(); 3946975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // BEGIN Android-removed 3956232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson // sun.reflect.misc.ReflectUtil.ensureMemberAccess( 3966232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson // caller, tclass, null, modifiers); 39791770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // ClassLoader cl = tclass.getClassLoader(); 39891770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // ClassLoader ccl = caller.getClassLoader(); 39991770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // if ((ccl != null) && (ccl != cl) && 40091770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // ((cl == null) || !isAncestor(cl, ccl))) { 401b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak // sun.reflect.misc.ReflectUtil.checkPackageAccess(tclass); 40291770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // } 4036975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // END Android-removed 4046975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // BEGIN Android-removed 40591770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // } catch (PrivilegedActionException pae) { 40691770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // throw new RuntimeException(pae.getException()); 4076975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // END Android-removed 408bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson } catch (Exception ex) { 409adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new RuntimeException(ex); 410adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 411bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson 412b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak if (field.getType() != int.class) 413adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IllegalArgumentException("Must be integer type"); 414bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson 415bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson if (!Modifier.isVolatile(modifiers)) 416adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IllegalArgumentException("Must be volatile type"); 417bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson 418b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak this.cclass = (Modifier.isProtected(modifiers)) ? caller : tclass; 419adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this.tclass = tclass; 420b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak this.offset = U.objectFieldOffset(field); 421adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 422adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 4236975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // BEGIN Android-removed 42491770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // /** 42591770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // * Returns true if the second classloader can be found in the first 42691770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // * classloader's delegation chain. 42791770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // * Equivalent to the inaccessible: first.isAncestor(second). 42891770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // */ 429b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak // private static boolean isAncestor(ClassLoader first, ClassLoader second) { 43091770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // ClassLoader acl = first; 43191770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // do { 43291770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // acl = acl.getParent(); 43391770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // if (second == acl) { 43491770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // return true; 43591770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // } 43691770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // } while (acl != null); 43791770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // return false; 43891770798d8b9280d48d30df2ed7f63b3ed9b036fCalin Juravle // } 4396975f84c2ed72e1e26d20190b6f318718c849008Tobias Thierer // END Android-removed 440b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 441b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 442b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Checks that target argument is instance of cclass. On 443b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * failure, throws cause. 444b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 445b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak private final void accessCheck(T obj) { 446b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak if (!cclass.isInstance(obj)) 447b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak throwAccessCheckException(obj); 448b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 449b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 450b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak /** 451b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * Throws access exception if accessCheck failed due to 452b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak * protected access, else ClassCastException. 453b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak */ 454b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak private final void throwAccessCheckException(T obj) { 455b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak if (cclass == tclass) 456adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new ClassCastException(); 457b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak else 458b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak throw new RuntimeException( 459b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak new IllegalAccessException( 460b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak "Class " + 461b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak cclass.getName() + 462b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak " can not access a protected member of class " + 463b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak tclass.getName() + 464b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak " using an instance of " + 465b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak obj.getClass().getName())); 466bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson } 467bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson 468b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final boolean compareAndSet(T obj, int expect, int update) { 469b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 470b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return U.compareAndSwapInt(obj, offset, expect, update); 471adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 472adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 473b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final boolean weakCompareAndSet(T obj, int expect, int update) { 474b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 475b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return U.compareAndSwapInt(obj, offset, expect, update); 476adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 477adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 478b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final void set(T obj, int newValue) { 479b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 480b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak U.putIntVolatile(obj, offset, newValue); 481adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 482adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 483b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final void lazySet(T obj, int newValue) { 484b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 485b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak U.putOrderedInt(obj, offset, newValue); 4866232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson } 4876232a5efed0ea103e35aec73206e5e03a8b82e0cJesse Wilson 488adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public final int get(T obj) { 489b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 490b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return U.getIntVolatile(obj, offset); 491adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 492bba8d1acd6dfff06c94d761c67a30154ca5ca5dfJesse Wilson 493b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndSet(T obj, int newValue) { 494b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 495b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return U.getAndSetInt(obj, offset, newValue); 496b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 497b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 498b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndAdd(T obj, int delta) { 499b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak accessCheck(obj); 500b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return U.getAndAddInt(obj, offset, delta); 501b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 502b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 503b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndIncrement(T obj) { 504b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return getAndAdd(obj, 1); 505b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 506b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 507b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int getAndDecrement(T obj) { 508b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return getAndAdd(obj, -1); 5095328e07d282bef36ac8b757bbee16a761415b2c4Przemyslaw Szczepaniak } 510b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 511b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int incrementAndGet(T obj) { 512b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return getAndAdd(obj, 1) + 1; 513b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 514b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 515b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int decrementAndGet(T obj) { 516b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return getAndAdd(obj, -1) - 1; 517b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 518b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 519b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak public final int addAndGet(T obj, int delta) { 520b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak return getAndAdd(obj, delta) + delta; 521b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak } 522b8b75116273ecfdb8ffdd1869b1c0dd04570a95ePrzemyslaw Szczepaniak 523adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 524adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 525