1 /* 2 * Copyright (c) 2015, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.graalvm.compiler.word; 24 25 /** 26 * A {@link Unsigned} value that may be updated atomically. See the 27 * {@link java.util.concurrent.atomic} package specification for description of the properties of 28 * atomic variables. 29 */ 30 public class AtomicUnsigned extends AtomicWord<Unsigned> { 31 32 /** 33 * Atomically adds the given value to the current value. 34 * 35 * @param delta the value to add 36 * @return the previous value 37 */ 38 public final Unsigned getAndAdd(Unsigned delta) { 39 return Word.unsigned(value.getAndAdd(delta.rawValue())); 40 } 41 42 /** 43 * Atomically adds the given value to the current value. 44 * 45 * @param delta the value to add 46 * @return the updated value 47 */ 48 public final Unsigned addAndGet(Unsigned delta) { 49 return Word.unsigned(value.addAndGet(delta.rawValue())); 50 } 51 52 /** 53 * Atomically subtracts the given value from the current value. 54 * 55 * @param delta the value to add 56 * @return the previous value 57 */ 58 public final Unsigned getAndSubtract(Unsigned delta) { 59 return Word.unsigned(value.getAndAdd(-delta.rawValue())); 60 } 61 62 /** 63 * Atomically subtracts the given value from the current value. 64 * 65 * @param delta the value to add 66 * @return the updated value 67 */ 68 public final Unsigned subtractAndGet(Unsigned delta) { 69 return Word.unsigned(value.addAndGet(-delta.rawValue())); 70 } 71 }