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annotate src/classes/java/util/concurrent/atomic/AtomicIntegerArray.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
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2 * Copyright (C) 2014, United States Government, as represented by the
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3 * Administrator of the National Aeronautics and Space Administration.
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4 * All rights reserved.
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5 *
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6 * The Java Pathfinder core (jpf-core) platform is licensed under the
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7 * Apache License, Version 2.0 (the "License"); you may not use this file except
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8 * in compliance with the License. You may obtain a copy of the License at
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9 *
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10 * http://www.apache.org/licenses/LICENSE-2.0.
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11 *
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 */
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18
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19 package java.util.concurrent.atomic;
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20
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21 import java.io.Serializable;
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22 import java.util.Arrays;
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23
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24 /**
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25 * model class for AtomicIntegerArray
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26 */
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27 public class AtomicIntegerArray implements Serializable {
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28 private static final long serialVersionUID = 2862133569453604235L;
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29
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30 private final int[] array;
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31
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32 public AtomicIntegerArray(int length) {
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33 array = new int[length];
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34 // <2do> need a volatile write in order to conform to JMM // Does this really matter in JPF?
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35 }
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36
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37 public AtomicIntegerArray(int[] array) {
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38 if (array == null)
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39 throw new NullPointerException();
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40
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41 int length = array.length;
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42 this.array = new int[length];
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43
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44 for (int i = 0; i < length; ++i)
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45 this.array[i] = array[i];
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46
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47 // <2do> need a volatile write in order to conform to JMM // Does this really matter in JPF?
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48 }
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49
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50 public final int length() {
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51 return(array.length);
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52 }
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53
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54 public final int get(int i) {
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55 checkIndex(i);
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56 return(getNative(i));
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57 }
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58
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59 private final native int getNative(int i);
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60
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61 public final boolean compareAndSet(int i, int expect, int update) {
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62 checkIndex(i);
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63 return(compareAndSetNative(i, expect, update));
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64 }
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65
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66 private final native boolean compareAndSetNative(int i, int expect, int update);
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67
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68 public final boolean weakCompareAndSet(int i, int expect, int update) {
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69 return(compareAndSet(i, expect, update));
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70 }
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71
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72 public final int getAndSet(int i, int newValue) {
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73 while (true) {
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74 int current = get(i);
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75 if (compareAndSet(i, current, newValue))
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76 return(current);
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77 }
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78 }
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79
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80 public final void set(int i, int newValue) {
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81 getAndSet(i, newValue);
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82 }
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83
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84 public final void lazySet(int i, int newValue) {
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85 set(i, newValue);
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86 }
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87
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88 public final int getAndIncrement(int i) {
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89 return(getAndAdd(i, 1));
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90 }
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91
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92 public final int getAndDecrement(int i) {
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93 return(getAndAdd(i, -1));
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94 }
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95
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96 public final int getAndAdd(int i, int delta) {
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97 while (true) {
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98 int current = get(i);
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99 int next = current + delta;
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100 if (compareAndSet(i, current, next))
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101 return(current);
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102 }
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103 }
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104
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105 public final int incrementAndGet(int i) {
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106 return(getAndIncrement(i) + 1);
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107 }
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108
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109 public final int decrementAndGet(int i) {
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110 return(getAndDecrement(i) - 1);
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111 }
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112
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113 public final int addAndGet(int i, int delta) {
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114 return(getAndAdd(i, delta) + delta);
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115 }
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116
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117 @Override
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118 public String toString() {
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119 // <2do> need a volatile read in order to conform to JMM // Does this really matter in JPF?
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120 return(Arrays.toString(array));
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121 }
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122
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123 private void checkIndex(int i) {
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124 if (i < 0 || i >= array.length)
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125 throw new IndexOutOfBoundsException("index " + i);
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126 }
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127 }