Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/QueuedSemaphore.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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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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Initial checkin of blitz 2.0 fcs - no installer yet.
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132 } |
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133 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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134 } |
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135 catch(InterruptedException ex) { |
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136 if (waiting) { // no notification |
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137 waiting = false; // invalidate for the signaller |
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138 throw ex; |
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139 } |
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140 else { // thread was interrupted after it was notified |
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141 Thread.currentThread().interrupt(); |
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142 return true; |
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143 } |
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144 } |
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145 } |
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146 } |
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147 |
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148 protected synchronized void doWait(QueuedSemaphore sem) |
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149 throws InterruptedException { |
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150 if (!sem.recheck(this)) { |
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151 try { |
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152 while (waiting) wait(); |
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153 } |
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154 catch(InterruptedException ex) { |
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155 if (waiting) { // no notification |
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156 waiting = false; // invalidate for the signaller |
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157 throw ex; |
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158 } |
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159 else { // thread was interrupted after it was notified |
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160 Thread.currentThread().interrupt(); |
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161 return; |
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162 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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163 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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164 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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165 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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166 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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167 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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168 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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169 |
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170 |
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171 } |