Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/WaiterPreferenceSemaphore.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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0
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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 |