Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/CountDown.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: CountDown.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 */ |
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13 |
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14 package EDU.oswego.cs.dl.util.concurrent; |
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15 |
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16 /** |
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17 * A CountDown can serve as a simple one-shot barrier. |
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18 * A Countdown is initialized |
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19 * with a given count value. Each release decrements the count. |
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20 * All acquires block until the count reaches zero. Upon reaching |
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21 * zero all current acquires are unblocked and all |
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22 * subsequent acquires pass without blocking. This is a one-shot |
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23 * phenomenon -- the count cannot be reset. |
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24 * If you need a version that resets the count, consider |
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25 * using a Barrier. |
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26 * <p> |
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27 * <b>Sample usage.</b> Here are a set of classes in which |
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28 * a group of worker threads use a countdown to |
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29 * notify a driver when all threads are complete. |
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30 * <pre> |
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31 * class Worker implements Runnable { |
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32 * private final CountDown done; |
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33 * Worker(CountDown d) { done = d; } |
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34 * public void run() { |
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35 * doWork(); |
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36 * done.release(); |
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37 * } |
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38 * } |
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39 * |
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40 * class Driver { // ... |
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41 * void main() { |
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42 * CountDown done = new CountDown(N); |
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43 * for (int i = 0; i < N; ++i) |
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44 * new Thread(new Worker(done)).start(); |
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45 * doSomethingElse(); |
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46 * done.acquire(); // wait for all to finish |
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47 * } |
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48 * } |
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49 * </pre> |
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50 * |
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51 * <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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52 * |
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53 **/ |
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54 |
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55 public class CountDown implements Sync { |
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56 protected final int initialCount_; |
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57 protected int count_; |
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58 |
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59 /** Create a new CountDown with given count value **/ |
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60 public CountDown(int count) { count_ = initialCount_ = count; } |
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61 |
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62 |
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63 /* |
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64 This could use double-check, but doesn't out of concern |
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65 for surprising effects on user programs stemming |
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66 from lack of memory barriers with lack of synch. |
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67 */ |
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68 public void acquire() throws InterruptedException { |
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69 if (Thread.interrupted()) throw new InterruptedException(); |
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70 synchronized(this) { |
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71 while (count_ > 0) |
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72 wait(); |
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73 } |
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74 } |
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75 |
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76 |
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77 public boolean attempt(long msecs) throws InterruptedException { |
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78 if (Thread.interrupted()) throw new InterruptedException(); |
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79 synchronized(this) { |
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80 if (count_ <= 0) |
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81 return true; |
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82 else if (msecs <= 0) |
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83 return false; |
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84 else { |
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85 long waitTime = msecs; |
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86 long start = System.currentTimeMillis(); |
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87 for (;;) { |
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88 wait(waitTime); |
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89 if (count_ <= 0) |
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90 return true; |
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91 else { |
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92 waitTime = msecs - (System.currentTimeMillis() - start); |
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93 if (waitTime <= 0) |
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94 return false; |
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95 } |
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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 |
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101 /** |
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102 * Decrement the count. |
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103 * After the initialCount'th release, all current and future |
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104 * acquires will pass |
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105 **/ |
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106 public synchronized void release() { |
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107 if (--count_ == 0) |
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108 notifyAll(); |
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109 } |
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110 |
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111 /** Return the initial count value **/ |
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112 public int initialCount() { return initialCount_; } |
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113 |
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114 |
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115 /** |
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116 * Return the current count value. |
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117 * This is just a snapshot value, that may change immediately |
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118 * after returning. |
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119 **/ |
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diff
changeset
|
120 public synchronized int currentCount() { return count_; } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
121 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
122 |