Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableShort.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 File: WaitableShort.java
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3
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4 Originally written by Doug Lea and released into the public domain.
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5 This may be used for any purposes whatsoever without acknowledgment.
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6 Thanks for the assistance and support of Sun Microsystems Labs,
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7 and everyone contributing, testing, and using this code.
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8
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9 History:
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10 Date Who What
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11 23Jun1998 dl Create public version
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12 */
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13
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14 package EDU.oswego.cs.dl.util.concurrent;
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15
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16 /**
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17 * A class useful for offloading waiting and signalling operations
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18 * on single short variables.
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19 * <p>
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20 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
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21 **/
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22
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23 public class WaitableShort extends SynchronizedShort {
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24 /**
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25 * Make a new WaitableShort with the given initial value,
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26 * and using its own internal lock.
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27 **/
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28 public WaitableShort(short initialValue) {
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29 super(initialValue);
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30 }
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31
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32 /**
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33 * Make a new WaitableShort with the given initial value,
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34 * and using the supplied lock.
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35 **/
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36 public WaitableShort(short initialValue, Object lock) {
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37 super(initialValue, lock);
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38 }
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39
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40
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41 public short set(short newValue) {
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42 synchronized (lock_) {
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43 lock_.notifyAll();
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44 return super.set(newValue);
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45 }
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46 }
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47
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48 public boolean commit(short assumedValue, short newValue) {
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49 synchronized (lock_) {
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50 boolean success = super.commit(assumedValue, newValue);
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51 if (success) lock_.notifyAll();
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52 return success;
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53 }
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54 }
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55
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56 public short increment() {
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57 synchronized (lock_) {
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58 lock_.notifyAll();
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59 return super.increment();
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60 }
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61 }
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62
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63 public short decrement() {
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64 synchronized (lock_) {
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65 lock_.notifyAll();
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66 return super.decrement();
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67 }
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68 }
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69
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70 public short add(short amount) {
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71 synchronized (lock_) {
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72 lock_.notifyAll();
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73 return super.add(amount);
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74 }
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75 }
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76
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77 public short subtract(short amount) {
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78 synchronized (lock_) {
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79 lock_.notifyAll();
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80 return super.subtract(amount);
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81 }
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82 }
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83
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84 public short multiply(short factor) {
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85 synchronized (lock_) {
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86 lock_.notifyAll();
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87 return super.multiply(factor);
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88 }
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89 }
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90
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91 public short divide(short factor) {
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92 synchronized (lock_) {
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93 lock_.notifyAll();
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94 return super.divide(factor);
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95 }
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96 }
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97
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98
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99 /**
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100 * Wait until value equals c, then run action if nonnull.
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101 * The action is run with the synchronization lock held.
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102 **/
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103
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104 public void whenEqual(short c, Runnable action) throws InterruptedException {
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105 synchronized(lock_) {
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106 while (!(value_ == c)) lock_.wait();
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107 if (action != null) action.run();
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108 }
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109 }
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110
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111 /**
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112 * wait until value not equal to c, then run action if nonnull.
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113 * The action is run with the synchronization lock held.
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114 **/
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115 public void whenNotEqual(short c, Runnable action) throws InterruptedException {
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116 synchronized (lock_) {
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117 while (!(value_ != c)) lock_.wait();
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118 if (action != null) action.run();
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119 }
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120 }
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121
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122 /**
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123 * wait until value less than or equal to c, then run action if nonnull.
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124 * The action is run with the synchronization lock held.
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125 **/
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126 public void whenLessEqual(short c, Runnable action) throws InterruptedException {
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127 synchronized (lock_) {
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128 while (!(value_ <= c)) lock_.wait();
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129 if (action != null) action.run();
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130 }
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131 }
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132
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133 /**
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134 * wait until value less than c, then run action if nonnull.
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135 * The action is run with the synchronization lock held.
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136 **/
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137 public void whenLess(short c, Runnable action) throws InterruptedException {
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138 synchronized (lock_) {
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139 while (!(value_ < c)) lock_.wait();
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140 if (action != null) action.run();
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141 }
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142 }
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143
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144 /**
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145 * wait until value greater than or equal to c, then run action if nonnull.
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146 * The action is run with the synchronization lock held.
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147 **/
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148 public void whenGreaterEqual(short c, Runnable action) throws InterruptedException {
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149 synchronized (lock_) {
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150 while (!(value_ >= c)) lock_.wait();
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151 if (action != null) action.run();
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152 }
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153 }
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154
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155 /**
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156 * wait until value greater than c, then run action if nonnull.
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157 * The action is run with the synchronization lock held.
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158 **/
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159 public void whenGreater(short c, Runnable action) throws InterruptedException {
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160 synchronized (lock_) {
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161 while (!(value_ > c)) lock_.wait();
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162 if (action != null) action.run();
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163 }
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164 }
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165
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166 }
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167