Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/QueuedSemaphore.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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0
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1 /*
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2 File: QueuedSemaphore.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 24Aug1999 dl release(n): screen arguments
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14 */
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15
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16
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17 package EDU.oswego.cs.dl.util.concurrent;
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18
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19 /**
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20 * Abstract base class for semaphores relying on queued wait nodes.
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21 * <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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22 **/
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23
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24
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25 public abstract class QueuedSemaphore extends Semaphore {
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26
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27 protected final WaitQueue wq_;
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28
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29 QueuedSemaphore(WaitQueue q, long initialPermits) {
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30 super(initialPermits);
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31 wq_ = q;
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32 }
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33
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34 public void acquire() throws InterruptedException {
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35 if (Thread.interrupted()) throw new InterruptedException();
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36 if (precheck()) return;
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37 WaitQueue.WaitNode w = new WaitQueue.WaitNode();
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38 w.doWait(this);
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39 }
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40
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41 public boolean attempt(long msecs) throws InterruptedException {
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42 if (Thread.interrupted()) throw new InterruptedException();
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43 if (precheck()) return true;
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44 if (msecs <= 0) return false;
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45
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46 WaitQueue.WaitNode w = new WaitQueue.WaitNode();
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47 return w.doTimedWait(this, msecs);
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48 }
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49
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50 protected synchronized boolean precheck() {
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51 boolean pass = (permits_ > 0);
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52 if (pass) --permits_;
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53 return pass;
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54 }
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55
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56 protected synchronized boolean recheck(WaitQueue.WaitNode w) {
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57 boolean pass = (permits_ > 0);
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58 if (pass) --permits_;
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59 else wq_.insert(w);
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60 return pass;
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61 }
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62
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63
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64 protected synchronized WaitQueue.WaitNode getSignallee() {
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65 WaitQueue.WaitNode w = wq_.extract();
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66 if (w == null) ++permits_; // if none, inc permits for new arrivals
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67 return w;
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68 }
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69
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70 public void release() {
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71 for (;;) {
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72 WaitQueue.WaitNode w = getSignallee();
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73 if (w == null) return; // no one to signal
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74 if (w.signal()) return; // notify if still waiting, else skip
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75 }
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76 }
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77
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78 /** Release N permits **/
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79 public void release(long n) {
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80 if (n < 0) throw new IllegalArgumentException("Negative argument");
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81
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82 for (long i = 0; i < n; ++i) release();
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83 }
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84
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85 /**
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86 * Base class for internal queue classes for semaphores, etc.
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87 * Relies on subclasses to actually implement queue mechanics
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88 **/
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89
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90 protected static abstract class WaitQueue {
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91
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92 protected abstract void insert(WaitNode w);// assumed not to block
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93 protected abstract WaitNode extract(); // should return null if empty
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94
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95 protected static class WaitNode {
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96 boolean waiting = true;
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97 WaitNode next = null;
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98
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99 protected synchronized boolean signal() {
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100 boolean signalled = waiting;
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101 if (signalled) {
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102 waiting = false;
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103 notify();
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104 }
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105 return signalled;
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106 }
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107
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108 protected synchronized boolean doTimedWait(QueuedSemaphore sem,
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109 long msecs)
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110 throws InterruptedException {
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111 if (sem.recheck(this) || !waiting)
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112 return true;
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113 else if (msecs <= 0) {
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114 waiting = false;
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115 return false;
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116 }
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117 else {
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118 long waitTime = msecs;
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119 long start = System.currentTimeMillis();
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120
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121 try {
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122 for (;;) {
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123 wait(waitTime);
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124 if (!waiting) // definitely signalled
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125 return true;
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126 else {
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127 waitTime = msecs - (System.currentTimeMillis() - start);
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128 if (waitTime <= 0) { // timed out
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129 waiting = false;
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130 return false;
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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 catch(InterruptedException ex) {
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Dan Creswell <dan.creswell@gmail.com>
parents:
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136 if (waiting) { // no notification
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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137 waiting = false; // invalidate for the signaller
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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138 throw ex;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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139 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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140 else { // thread was interrupted after it was notified
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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141 Thread.currentThread().interrupt();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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142 return true;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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143 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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144 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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145 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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146 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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147
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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148 protected synchronized void doWait(QueuedSemaphore sem)
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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149 throws InterruptedException {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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150 if (!sem.recheck(this)) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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151 try {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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152 while (waiting) wait();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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153 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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154 catch(InterruptedException ex) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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155 if (waiting) { // no notification
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
156 waiting = false; // invalidate for the signaller
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157 throw ex;
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Dan Creswell <dan.creswell@gmail.com>
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158 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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159 else { // thread was interrupted after it was notified
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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160 Thread.currentThread().interrupt();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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161 return;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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162 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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163 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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164 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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165 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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166 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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167
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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168 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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169
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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170
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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171 }