Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/ReentrantLock.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: ReentrantLock.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 package EDU.oswego.cs.dl.util.concurrent; |
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16 |
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17 /** |
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18 * A lock with the same semantics as builtin |
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19 * Java synchronized locks: Once a thread has a lock, it |
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20 * can re-obtain it any number of times without blocking. |
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21 * The lock is made available to other threads when |
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22 * as many releases as acquires have occurred. |
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23 * <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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24 **/ |
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25 |
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26 |
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27 public class ReentrantLock implements Sync { |
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28 |
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29 protected Thread owner_ = null; |
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30 protected long holds_ = 0; |
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31 |
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32 public void acquire() throws InterruptedException { |
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33 if (Thread.interrupted()) throw new InterruptedException(); |
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34 Thread caller = Thread.currentThread(); |
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35 synchronized(this) { |
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36 if (caller == owner_) |
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37 ++holds_; |
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38 else { |
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39 try { |
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40 while (owner_ != null) wait(); |
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41 owner_ = caller; |
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42 holds_ = 1; |
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43 } |
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44 catch (InterruptedException ex) { |
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45 notify(); |
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46 throw ex; |
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47 } |
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48 } |
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49 } |
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50 } |
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51 |
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52 |
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53 public boolean attempt(long msecs) throws InterruptedException { |
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54 if (Thread.interrupted()) throw new InterruptedException(); |
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55 Thread caller = Thread.currentThread(); |
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56 synchronized(this) { |
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57 if (caller == owner_) { |
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58 ++holds_; |
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59 return true; |
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60 } |
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61 else if (owner_ == null) { |
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62 owner_ = caller; |
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63 holds_ = 1; |
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64 return true; |
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65 } |
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66 else if (msecs <= 0) |
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67 return false; |
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68 else { |
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69 long waitTime = msecs; |
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70 long start = System.currentTimeMillis(); |
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71 try { |
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72 for (;;) { |
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73 wait(waitTime); |
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74 if (caller == owner_) { |
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75 ++holds_; |
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76 return true; |
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77 } |
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78 else if (owner_ == null) { |
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79 owner_ = caller; |
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80 holds_ = 1; |
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81 return true; |
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82 } |
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83 else { |
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84 waitTime = msecs - (System.currentTimeMillis() - start); |
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85 if (waitTime <= 0) |
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86 return false; |
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87 } |
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88 } |
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89 } |
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90 catch (InterruptedException ex) { |
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91 notify(); |
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92 throw ex; |
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93 } |
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94 } |
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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 * Release the lock. |
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100 * @exception Error thrown if not current owner of lock |
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101 **/ |
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102 public synchronized void release() { |
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103 if (Thread.currentThread() != owner_) |
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104 throw new Error("Illegal Lock usage"); |
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105 |
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106 if (--holds_ == 0) { |
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107 owner_ = null; |
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108 notify(); |
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109 } |
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110 } |
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111 |
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112 /** |
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113 * Release the lock N times. <code>release(n)</code> is |
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114 * equivalent in effect to: |
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115 * <pre> |
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116 * for (int i = 0; i < n; ++i) release(); |
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117 * </pre> |
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118 * <p> |
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119 * @exception Error thrown if not current owner of lock |
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120 * or has fewer than N holds on the lock |
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121 **/ |
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122 public synchronized void release(long n) { |
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123 if (Thread.currentThread() != owner_ || n > holds_) |
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124 throw new Error("Illegal Lock usage"); |
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125 |
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126 holds_ -= n; |
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127 if (holds_ == 0) { |
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128 owner_ = null; |
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129 notify(); |
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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 * Return the number of unreleased acquires performed |
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136 * by the current thread. |
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137 * Returns zero if current thread does not hold lock. |
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138 **/ |
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139 public synchronized long holds() { |
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140 if (Thread.currentThread() != owner_) return 0; |
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141 return holds_; |
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142 } |
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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 |