Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/CyclicBarrier.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: CyclicBarrier.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 11Jul1998 dl Create public version |
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12 28Aug1998 dl minor code simplification |
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13 */ |
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14 |
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15 package EDU.oswego.cs.dl.util.concurrent; |
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16 |
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17 /** |
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18 * A cyclic barrier is a reasonable choice for a barrier in contexts |
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19 * involving a fixed sized group of threads that |
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20 * must occasionally wait for each other. |
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21 * (A Rendezvous better handles applications in which |
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22 * any number of threads meet, n-at-a-time.) |
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23 * <p> |
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24 * CyclicBarriers use an all-or-none breakage model |
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25 * for failed synchronization attempts: If threads |
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26 * leave a barrier point prematurely because of timeout |
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27 * or interruption, others will also leave abnormally |
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28 * (via BrokenBarrierException), until |
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29 * the barrier is <code>restart</code>ed. This is usually |
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30 * the simplest and best strategy for sharing knowledge |
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31 * about failures among cooperating threads in the most |
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32 * common usages contexts of Barriers. |
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33 * This implementation has the property that interruptions |
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34 * among newly arriving threads can cause as-yet-unresumed |
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35 * threads from a previous barrier cycle to return out |
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36 * as broken. This transmits breakage |
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37 * as early as possible, but with the possible byproduct that |
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38 * only some threads returning out of a barrier will realize |
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39 * that it is newly broken. (Others will not realize this until a |
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40 * future cycle.) (The Rendezvous class has a more uniform, but |
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41 * sometimes less desirable policy.) |
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42 * <p> |
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43 * Barriers support an optional Runnable command |
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44 * that is run once per barrier point. |
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45 * <p> |
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46 * <b>Sample usage</b> Here is a code sketch of |
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47 * a barrier in a parallel decomposition design. |
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48 * <pre> |
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49 * class Solver { |
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50 * final int N; |
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51 * final float[][] data; |
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52 * final CyclicBarrier barrier; |
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53 * |
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54 * class Worker implements Runnable { |
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55 * int myRow; |
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56 * Worker(int row) { myRow = row; } |
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57 * public void run() { |
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58 * while (!done()) { |
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59 * processRow(myRow); |
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60 * |
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61 * try { |
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62 * barrier.barrier(); |
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63 * } |
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64 * catch (InterruptedException ex) { return; } |
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65 * catch (BrokenBarrierException ex) { return; } |
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66 * } |
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67 * } |
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68 * } |
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69 * |
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70 * public Solver(float[][] matrix) { |
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71 * data = matrix; |
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72 * N = matrix.length; |
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73 * barrier = new CyclicBarrier(N); |
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74 * barrier.setBarrierCommand(new Runnable() { |
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75 * public void run() { mergeRows(...); } |
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76 * }); |
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77 * for (int i = 0; i < N; ++i) { |
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78 * new Thread(new Worker(i)).start(); |
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79 * waitUntilDone(); |
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80 * } |
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81 * } |
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82 * </pre> |
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83 * <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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84 |
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85 **/ |
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86 public class CyclicBarrier implements Barrier { |
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87 |
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88 protected final int parties_; |
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89 protected boolean broken_ = false; |
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90 protected Runnable barrierCommand_ = null; |
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91 protected int count_; // number of parties still waiting |
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92 protected int resets_ = 0; // incremented on each release |
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93 |
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94 /** |
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95 * Create a CyclicBarrier for the indicated number of parties, |
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96 * and no command to run at each barrier. |
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97 * @exception IllegalArgumentException if parties less than or equal to zero. |
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98 **/ |
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99 |
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100 public CyclicBarrier(int parties) { this(parties, null); } |
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101 |
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102 /** |
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103 * Create a CyclicBarrier for the indicated number of parties. |
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104 * and the given command to run at each barrier point. |
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105 * @exception IllegalArgumentException if parties less than or equal to zero. |
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106 **/ |
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107 |
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108 public CyclicBarrier(int parties, Runnable command) { |
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109 if (parties <= 0) throw new IllegalArgumentException(); |
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110 parties_ = parties; |
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111 count_ = parties; |
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112 barrierCommand_ = command; |
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113 } |
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114 |
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115 /** |
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116 * Set the command to run at the point at which all threads reach the |
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117 * barrier. This command is run exactly once, by the thread |
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118 * that trips the barrier. The command is not run if the barrier is |
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119 * broken. |
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120 * @param command the command to run. If null, no command is run. |
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121 * @return the previous command |
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122 **/ |
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123 |
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124 public synchronized Runnable setBarrierCommand(Runnable command) { |
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125 Runnable old = barrierCommand_; |
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126 barrierCommand_ = command; |
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127 return old; |
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128 } |
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129 |
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130 public synchronized boolean broken() { return broken_; } |
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131 |
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132 /** |
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133 * Reset to initial state. Clears both the broken status |
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134 * and any record of waiting threads, and releases all |
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135 * currently waiting threads with indeterminate return status. |
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136 * This method is intended only for use in recovery actions |
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137 * in which it is somehow known |
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138 * that no thread could possibly be relying on the |
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139 * the synchronization properties of this barrier. |
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140 **/ |
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141 |
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142 public synchronized void restart() { |
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143 broken_ = false; |
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144 ++resets_; |
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145 count_ = parties_; |
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146 notifyAll(); |
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147 } |
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148 |
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149 |
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150 public int parties() { return parties_; } |
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151 |
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152 /** |
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153 * Enter barrier and wait for the other parties()-1 threads. |
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154 * @return the arrival index: the number of other parties |
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155 * that were still waiting |
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156 * upon entry. This is a unique value from zero to parties()-1. |
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157 * If it is zero, then the current |
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158 * thread was the last party to hit barrier point |
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159 * and so was responsible for releasing the others. |
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160 * @exception BrokenBarrierException if any other thread |
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161 * in any previous or current barrier |
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162 * since either creation or the last <code>restart</code> |
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163 * operation left the barrier |
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164 * prematurely due to interruption or time-out. (If so, |
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165 * the <code>broken</code> status is also set.) |
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166 * Threads that are noticied to have been |
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167 * interrupted <em>after</em> being released are not considered |
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168 * to have broken the barrier. |
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169 * In all cases, the interruption |
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170 * status of the current thread is preserved, so can be tested |
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171 * by checking <code>Thread.interrupted</code>. |
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172 * @exception InterruptedException if this thread was interrupted |
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173 * during the barrier, and was the one causing breakage. |
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174 * If so, <code>broken</code> status is also set. |
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175 **/ |
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176 |
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177 public int barrier() throws InterruptedException, BrokenBarrierException { |
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178 return doBarrier(false, 0); |
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179 } |
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180 |
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181 /** |
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182 * Enter barrier and wait at most msecs for the other parties()-1 threads. |
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183 * @return if not timed out, the arrival index: the number of other parties |
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184 * that were still waiting |
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185 * upon entry. This is a unique value from zero to parties()-1. |
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186 * If it is zero, then the current |
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187 * thread was the last party to hit barrier point |
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188 * and so was responsible for releasing the others. |
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189 * @exception BrokenBarrierException |
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190 * if any other thread |
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191 * in any previous or current barrier |
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192 * since either creation or the last <code>restart</code> |
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193 * operation left the barrier |
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194 * prematurely due to interruption or time-out. (If so, |
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195 * the <code>broken</code> status is also set.) |
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196 * Threads that are noticed to have been |
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197 * interrupted <em>after</em> being released are not considered |
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198 * to have broken the barrier. |
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199 * In all cases, the interruption |
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200 * status of the current thread is preserved, so can be tested |
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201 * by checking <code>Thread.interrupted</code>. |
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202 * @exception InterruptedException if this thread was interrupted |
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203 * during the barrier. If so, <code>broken</code> status is also set. |
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204 * @exception TimeoutException if this thread timed out waiting for |
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205 * the barrier. If the timeout occured while already in the |
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206 * barrier, <code>broken</code> status is also set. |
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207 **/ |
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208 |
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209 public int attemptBarrier(long msecs) |
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210 throws InterruptedException, TimeoutException, BrokenBarrierException { |
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211 return doBarrier(true, msecs); |
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212 } |
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213 |
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214 protected synchronized int doBarrier(boolean timed, long msecs) |
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215 throws InterruptedException, TimeoutException, BrokenBarrierException { |
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216 |
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217 int index = --count_; |
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218 |
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219 if (broken_) { |
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220 throw new BrokenBarrierException(index); |
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221 } |
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222 else if (Thread.interrupted()) { |
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223 broken_ = true; |
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224 notifyAll(); |
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225 throw new InterruptedException(); |
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226 } |
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227 else if (index == 0) { // tripped |
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228 count_ = parties_; |
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229 ++resets_; |
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230 notifyAll(); |
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231 try { |
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232 if (barrierCommand_ != null) |
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233 barrierCommand_.run(); |
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234 return 0; |
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235 } |
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236 catch (RuntimeException ex) { |
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237 broken_ = true; |
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238 return 0; |
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239 } |
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240 } |
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241 else if (timed && msecs <= 0) { |
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242 broken_ = true; |
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243 notifyAll(); |
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244 throw new TimeoutException(msecs); |
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245 } |
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246 else { // wait until next reset |
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247 int r = resets_; |
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248 long startTime = (timed)? System.currentTimeMillis() : 0; |
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249 long waitTime = msecs; |
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250 for (;;) { |
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251 try { |
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252 wait(waitTime); |
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253 } |
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254 catch (InterruptedException ex) { |
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255 // Only claim that broken if interrupted before reset |
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256 if (resets_ == r) { |
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257 broken_ = true; |
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258 notifyAll(); |
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259 throw ex; |
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260 } |
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261 else { |
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262 Thread.currentThread().interrupt(); // propagate |
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263 } |
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264 } |
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265 |
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266 if (broken_) |
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267 throw new BrokenBarrierException(index); |
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268 |
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269 else if (r != resets_) |
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270 return index; |
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271 |
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272 else if (timed) { |
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273 waitTime = msecs - (System.currentTimeMillis() - startTime); |
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274 if (waitTime <= 0) { |
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275 broken_ = true; |
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276 notifyAll(); |
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277 throw new TimeoutException(msecs); |
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278 } |
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279 } |
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280 } |
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281 } |
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282 } |
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283 |
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284 } |