Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/WaiterPreferenceSemaphore.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: WaiterPreferenceSemaphore.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 5Aug1998 dl replaced int counters with longs
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13 */
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14
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15
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16 package EDU.oswego.cs.dl.util.concurrent;
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17
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18 /**
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19 * An implementation of counting Semaphores that
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20 * enforces enough fairness for applications that
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21 * need to avoid indefinite overtaking without
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22 * necessarily requiring FIFO ordered access.
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23 * Empirically, very little is paid for this property
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24 * unless there is a lot of contention among threads
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25 * or very unfair JVM scheduling.
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26 * The acquire method waits even if there are permits
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27 * available but have not yet been claimed by threads that have
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28 * been notified but not yet resumed. This makes the semaphore
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29 * almost as fair as the underlying Java primitives allow.
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30 * So, if synch lock entry and notify are both fair
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31 * so is the semaphore -- almost: Rewaits stemming
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32 * from timeouts in attempt, along with potentials for
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33 * interrupted threads to be notified can compromise fairness,
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34 * possibly allowing later-arriving threads to pass before
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35 * later arriving ones. However, in no case can a newly
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36 * entering thread obtain a permit if there are still others waiting.
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37 * Also, signalling order need not coincide with
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38 * resumption order. Later-arriving threads might get permits
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39 * and continue before other resumable threads are actually resumed.
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40 * However, all of these potential fairness breaches are
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41 * very rare in practice unless the underlying JVM
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42 * performs strictly LIFO notifications (which has, sadly enough,
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43 * been known to occur) in which case you need to use
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44 * a FIFOSemaphore to maintain a reasonable approximation
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45 * of fairness.
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46 * <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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47 **/
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48
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49
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50 public final class WaiterPreferenceSemaphore extends Semaphore {
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51
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52 /**
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53 * Create a Semaphore with the given initial number of permits.
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54 **/
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55
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56 public WaiterPreferenceSemaphore(long initial) { super(initial); }
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57
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58 /** Number of waiting threads **/
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59 protected long waits_ = 0;
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60
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61 public void acquire() throws InterruptedException {
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62 if (Thread.interrupted()) throw new InterruptedException();
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63 synchronized(this) {
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64 /*
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65 Only take if there are more permits than threads waiting
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66 for permits. This prevents infinite overtaking.
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67 */
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68 if (permits_ > waits_) {
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69 --permits_;
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70 return;
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71 }
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72 else {
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73 ++waits_;
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74 try {
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75 for (;;) {
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76 wait();
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77 if (permits_ > 0) {
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78 --waits_;
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79 --permits_;
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80 return;
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81 }
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82 }
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83 }
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84 catch(InterruptedException ex) {
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85 --waits_;
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86 notify();
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87 throw ex;
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88 }
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89 }
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90 }
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91 }
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92
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93 public boolean attempt(long msecs) throws InterruptedException {
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94 if (Thread.interrupted()) throw new InterruptedException();
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95
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96 synchronized(this) {
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97 if (permits_ > waits_) {
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98 --permits_;
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99 return true;
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100 }
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101 else if (msecs <= 0)
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102 return false;
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103 else {
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104 ++waits_;
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105
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106 long startTime = System.currentTimeMillis();
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107 long waitTime = msecs;
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108
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109 try {
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110 for (;;) {
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111 wait(waitTime);
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112 if (permits_ > 0) {
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113 --waits_;
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114 --permits_;
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115 return true;
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116 }
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117 else { // got a time-out or false-alarm notify
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118 waitTime = msecs - (System.currentTimeMillis() - startTime);
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119 if (waitTime <= 0) {
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120 --waits_;
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121 return false;
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122 }
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123 }
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124 }
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125 }
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126 catch(InterruptedException ex) {
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127 --waits_;
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128 notify();
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129 throw ex;
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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
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135 public synchronized void release() {
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136 ++permits_;
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137 notify();
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138 }
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139
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140 /** Release N permits **/
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141 public synchronized void release(long n) {
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142 permits_ += n;
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143 for (long i = 0; i < n; ++i) notify();
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144 }
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145
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146 }
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147