Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/ReentrantLock.java @ 32:243c74d599bf

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author Dan Creswell <dan.creswell@gmail.com>
date Sat, 12 Jun 2010 10:41:47 +0100
parents 3dc0c5604566
children
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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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Dan Creswell <dan.creswell@gmail.com>
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138 **/
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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139 public synchronized long holds() {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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140 if (Thread.currentThread() != owner_) return 0;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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141 return holds_;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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142 }
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Dan Creswell <dan.creswell@gmail.com>
parents:
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143
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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144
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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145
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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146 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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147