Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/Rendezvous.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: Rendezvous.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 11Jun1998 dl Create public version |
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12 30Jul1998 dl Minor code simplifications |
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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 rendezvous is a barrier that: |
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19 * <ul> |
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20 * <li> Unlike a CyclicBarrier, is not restricted to use |
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21 * with fixed-sized groups of threads. |
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22 * Any number of threads can attempt to enter a rendezvous, |
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23 * but only the predetermined number of parties enter |
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24 * and later become released from the rendezvous at any give time. |
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25 * <li> Enables each participating thread to exchange information |
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26 * with others at the rendezvous point. Each entering thread |
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27 * presents some object on entry to the rendezvous, and |
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28 * returns some object on release. The object returned is |
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29 * the result of a RendezvousFunction that is run once per |
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30 * rendezvous, (it is run by the last-entering thread). By |
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31 * default, the function applied is a rotation, so each |
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32 * thread returns the object given by the next (modulo parties) |
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33 * entering thread. This default function faciliates simple |
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34 * application of a common use of rendezvous, as exchangers. |
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35 * </ul> |
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36 * <p> |
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37 * Rendezvous use an all-or-none breakage model |
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38 * for failed synchronization attempts: If threads |
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39 * leave a rendezvous point prematurely because of timeout |
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40 * or interruption, others will also leave abnormally |
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41 * (via BrokenBarrierException), until |
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42 * the rendezvous is <code>restart</code>ed. This is usually |
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43 * the simplest and best strategy for sharing knowledge |
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44 * about failures among cooperating threads in the most |
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45 * common usages contexts of Rendezvous. |
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46 * <p> |
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47 * While any positive number (including 1) of parties can |
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48 * be handled, the most common case is to have two parties. |
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49 * <p> |
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50 * <b>Sample Usage</b><p> |
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51 * Here are the highlights of a class that uses a Rendezvous to |
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52 * swap buffers between threads so that the thread filling the |
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53 * buffer gets a freshly |
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54 * emptied one when it needs it, handing off the filled one to |
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55 * the thread emptying the buffer. |
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56 * <pre> |
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57 * class FillAndEmpty { |
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58 * Rendezvous exchanger = new Rendezvous(2); |
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59 * Buffer initialEmptyBuffer = ... a made-up type |
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60 * Buffer initialFullBuffer = ... |
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61 * |
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62 * class FillingLoop implements Runnable { |
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63 * public void run() { |
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64 * Buffer currentBuffer = initialEmptyBuffer; |
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65 * try { |
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66 * while (currentBuffer != null) { |
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67 * addToBuffer(currentBuffer); |
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68 * if (currentBuffer.full()) |
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69 * currentBuffer = (Buffer)(exchanger.rendezvous(currentBuffer)); |
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70 * } |
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71 * } |
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72 * catch (BrokenBarrierException ex) { |
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73 * return; |
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74 * } |
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75 * catch (InterruptedException ex) { |
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76 * Thread.currentThread().interrupt(); |
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77 * } |
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78 * } |
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79 * } |
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80 * |
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81 * class EmptyingLoop implements Runnable { |
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82 * public void run() { |
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83 * Buffer currentBuffer = initialFullBuffer; |
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84 * try { |
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85 * while (currentBuffer != null) { |
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86 * takeFromBuffer(currentBuffer); |
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87 * if (currentBuffer.empty()) |
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88 * currentBuffer = (Buffer)(exchanger.rendezvous(currentBuffer)); |
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89 * } |
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90 * } |
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91 * catch (BrokenBarrierException ex) { |
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92 * return; |
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93 * } |
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94 * catch (InterruptedException ex) { |
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95 * Thread.currentThread().interrupt(); |
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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 * void start() { |
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101 * new Thread(new FillingLoop()).start(); |
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102 * new Thread(new EmptyingLoop()).start(); |
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103 * } |
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104 * } |
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105 * </pre> |
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106 * <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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107 |
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108 **/ |
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109 |
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110 public class Rendezvous implements Barrier { |
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111 |
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112 /** |
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113 * Interface for functions run at rendezvous points |
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114 **/ |
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115 public interface RendezvousFunction { |
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116 /** |
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117 * Perform some function on the objects presented at |
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118 * a rendezvous. The objects array holds all presented |
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119 * items; one per thread. Its length is the number of parties. |
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120 * The array is ordered by arrival into the rendezvous. |
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121 * So, the last element (at objects[objects.length-1]) |
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122 * is guaranteed to have been presented by the thread performing |
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123 * this function. No identifying information is |
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124 * otherwise kept about which thread presented which item. |
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125 * If you need to |
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126 * trace origins, you will need to use an item type for rendezvous |
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127 * that includes identifying information. After return of this |
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128 * function, other threads are released, and each returns with |
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129 * the item with the same index as the one it presented. |
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130 **/ |
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131 public void rendezvousFunction(Object[] objects); |
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132 } |
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133 |
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134 /** |
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135 * The default rendezvous function. Rotates the array |
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136 * so that each thread returns an item presented by some |
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137 * other thread (or itself, if parties is 1). |
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138 **/ |
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139 public static class Rotator implements RendezvousFunction { |
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140 /** Rotate the array **/ |
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141 public void rendezvousFunction(Object[] objects) { |
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142 int lastIdx = objects.length - 1; |
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143 Object first = objects[0]; |
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144 for (int i = 0; i < lastIdx; ++i) objects[i] = objects[i+1]; |
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145 objects[lastIdx] = first; |
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146 } |
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147 } |
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148 |
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149 |
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150 protected final int parties_; |
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151 |
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152 |
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153 protected boolean broken_ = false; |
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154 |
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155 /** |
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156 * Number of threads that have entered rendezvous |
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157 **/ |
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158 protected int entries_ = 0; |
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159 |
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160 /** |
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161 * Number of threads that are permitted to depart rendezvous |
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162 **/ |
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163 protected long departures_ = 0; |
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164 |
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165 /** |
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166 * Incoming threads pile up on entry until last set done. |
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167 **/ |
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168 protected final Semaphore entryGate_; |
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169 |
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170 /** |
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171 * Temporary holder for items in exchange |
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172 **/ |
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173 protected final Object[] slots_; |
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174 |
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175 /** |
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176 * The function to run at rendezvous point |
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177 **/ |
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178 |
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179 protected RendezvousFunction rendezvousFunction_; |
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180 |
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181 /** |
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182 * Create a Barrier for the indicated number of parties, |
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183 * and the default Rotator function to run at each barrier point. |
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184 * @exception IllegalArgumentException if parties less than or equal to zero. |
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185 **/ |
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186 |
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187 public Rendezvous(int parties) { |
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188 this(parties, new Rotator()); |
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189 } |
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190 |
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191 /** |
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192 * Create a Barrier for the indicated number of parties. |
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193 * and the given function to run at each barrier point. |
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194 * @exception IllegalArgumentException if parties less than or equal to zero. |
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195 **/ |
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196 |
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197 public Rendezvous(int parties, RendezvousFunction function) { |
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198 if (parties <= 0) throw new IllegalArgumentException(); |
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199 parties_ = parties; |
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200 rendezvousFunction_ = function; |
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201 entryGate_ = new WaiterPreferenceSemaphore(parties); |
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202 slots_ = new Object[parties]; |
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203 } |
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204 |
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205 /** |
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206 * Set the function to call at the point at which all threads reach the |
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207 * rendezvous. This function is run exactly once, by the thread |
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208 * that trips the barrier. The function is not run if the barrier is |
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209 * broken. |
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210 * @param function the function to run. If null, no function is run. |
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211 * @return the previous function |
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212 **/ |
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213 |
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214 |
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215 public synchronized RendezvousFunction setRendezvousFunction(RendezvousFunction function) { |
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216 RendezvousFunction old = rendezvousFunction_; |
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217 rendezvousFunction_ = function; |
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218 return old; |
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219 } |
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220 |
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221 public int parties() { return parties_; } |
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222 |
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223 public synchronized boolean broken() { return broken_; } |
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224 |
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225 /** |
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226 * Reset to initial state. Clears both the broken status |
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227 * and any record of waiting threads, and releases all |
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228 * currently waiting threads with indeterminate return status. |
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229 * This method is intended only for use in recovery actions |
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230 * in which it is somehow known |
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231 * that no thread could possibly be relying on the |
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232 * the synchronization properties of this barrier. |
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233 **/ |
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234 |
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235 public void restart() { |
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236 // This is not very good, but probably the best that can be done |
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237 for (;;) { |
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238 synchronized(this) { |
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239 if (entries_ != 0) { |
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240 notifyAll(); |
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241 } |
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242 else { |
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243 broken_ = false; |
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244 return; |
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245 } |
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246 } |
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247 Thread.yield(); |
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248 } |
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249 } |
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250 |
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251 |
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252 /** |
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253 * Enter a rendezvous; returning after all other parties arrive. |
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254 * @param x the item to present at rendezvous point. |
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255 * By default, this item is exchanged with another. |
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256 * @return an item x given by some thread, and/or processed |
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257 * by the rendezvousFunction. |
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258 * @exception BrokenBarrierException |
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259 * if any other thread |
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260 * in any previous or current barrier |
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261 * since either creation or the last <code>restart</code> |
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262 * operation left the barrier |
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263 * prematurely due to interruption or time-out. (If so, |
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264 * the <code>broken</code> status is also set.) |
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265 * Also returns as |
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266 * broken if the RendezvousFunction encountered a run-time exception. |
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267 * Threads that are noticed to have been |
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268 * interrupted <em>after</em> being released are not considered |
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269 * to have broken the barrier. |
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270 * In all cases, the interruption |
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271 * status of the current thread is preserved, so can be tested |
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272 * by checking <code>Thread.interrupted</code>. |
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273 * @exception InterruptedException if this thread was interrupted |
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274 * during the exchange. If so, <code>broken</code> status is also set. |
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275 **/ |
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276 |
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277 |
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278 public Object rendezvous(Object x) throws InterruptedException, BrokenBarrierException { |
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279 return doRendezvous(x, false, 0); |
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280 } |
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281 |
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282 /** |
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283 * Wait msecs to complete a rendezvous. |
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284 * @param x the item to present at rendezvous point. |
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285 * By default, this item is exchanged with another. |
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286 * @param msecs The maximum time to wait. |
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287 * @return an item x given by some thread, and/or processed |
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288 * by the rendezvousFunction. |
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289 * @exception BrokenBarrierException |
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290 * if any other thread |
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291 * in any previous or current barrier |
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292 * since either creation or the last <code>restart</code> |
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293 * operation left the barrier |
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294 * prematurely due to interruption or time-out. (If so, |
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295 * the <code>broken</code> status is also set.) |
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296 * Also returns as |
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297 * broken if the RendezvousFunction encountered a run-time exception. |
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298 * Threads that are noticed to have been |
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299 * interrupted <em>after</em> being released are not considered |
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300 * to have broken the barrier. |
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301 * In all cases, the interruption |
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302 * status of the current thread is preserved, so can be tested |
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303 * by checking <code>Thread.interrupted</code>. |
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304 * @exception InterruptedException if this thread was interrupted |
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305 * during the exchange. If so, <code>broken</code> status is also set. |
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306 * @exception TimeoutException if this thread timed out waiting for |
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307 * the exchange. If the timeout occured while already in the |
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308 * exchange, <code>broken</code> status is also set. |
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309 **/ |
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310 |
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311 |
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312 public Object attemptRendezvous(Object x, long msecs) |
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313 throws InterruptedException, TimeoutException, BrokenBarrierException { |
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314 return doRendezvous(x, true, msecs); |
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315 } |
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316 |
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317 protected Object doRendezvous(Object x, boolean timed, long msecs) |
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318 throws InterruptedException, TimeoutException, BrokenBarrierException { |
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319 |
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320 // rely on semaphore to throw interrupt on entry |
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321 |
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322 long startTime; |
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323 |
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324 if (timed) { |
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325 startTime = System.currentTimeMillis(); |
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326 if (!entryGate_.attempt(msecs)) { |
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327 throw new TimeoutException(msecs); |
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328 } |
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329 } |
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330 else { |
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331 startTime = 0; |
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332 entryGate_.acquire(); |
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333 } |
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334 |
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335 synchronized(this) { |
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336 |
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337 Object y = null; |
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338 |
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339 int index = entries_++; |
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340 slots_[index] = x; |
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341 |
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342 try { |
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343 // last one in runs function and releases |
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344 if (entries_ == parties_) { |
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345 |
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346 departures_ = entries_; |
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347 notifyAll(); |
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348 |
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349 try { |
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350 if (!broken_ && rendezvousFunction_ != null) |
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351 rendezvousFunction_.rendezvousFunction(slots_); |
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352 } |
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353 catch (RuntimeException ex) { |
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354 broken_ = true; |
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355 } |
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356 |
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357 } |
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358 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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359 else { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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360 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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361 while (!broken_ && departures_ < 1) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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362 long timeLeft = 0; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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363 if (timed) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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364 timeLeft = msecs - (System.currentTimeMillis() - startTime); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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365 if (timeLeft <= 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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366 broken_ = true; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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367 departures_ = entries_; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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368 notifyAll(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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369 throw new TimeoutException(msecs); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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370 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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371 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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372 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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373 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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374 wait(timeLeft); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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375 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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376 catch (InterruptedException ex) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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377 if (broken_ || departures_ > 0) { // interrupted after release |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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378 Thread.currentThread().interrupt(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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379 break; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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380 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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381 else { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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382 broken_ = true; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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383 departures_ = entries_; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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384 notifyAll(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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385 throw ex; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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386 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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387 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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388 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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389 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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390 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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391 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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392 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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393 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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394 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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395 y = slots_[index]; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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396 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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397 // Last one out cleans up and allows next set of threads in |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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398 if (--departures_ <= 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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399 for (int i = 0; i < slots_.length; ++i) slots_[i] = null; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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400 entryGate_.release(entries_); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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401 entries_ = 0; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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402 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
403 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
404 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
405 // continue if no IE/TO throw |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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406 if (broken_) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
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407 throw new BrokenBarrierException(index); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
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408 else |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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409 return y; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
410 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
411 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
412 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
413 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
414 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
415 |