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 }