Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/Mutex.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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1 /* |
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2 File: Mutex.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 simple non-reentrant mutual exclusion lock. |
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18 * The lock is free upon construction. Each acquire gets the |
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19 * lock, and each release frees it. Releasing a lock that |
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20 * is already free has no effect. |
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21 * <p> |
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22 * This implementation makes no attempt to provide any fairness |
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23 * or ordering guarantees. If you need them, consider using one of |
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24 * the Semaphore implementations as a locking mechanism. |
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25 * <p> |
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26 * <b>Sample usage</b><br> |
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27 * <p> |
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28 * Mutex can be useful in constructions that cannot be |
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29 * expressed using java synchronized blocks because the |
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30 * acquire/release pairs do not occur in the same method or |
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31 * code block. For example, you can use them for hand-over-hand |
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32 * locking across the nodes of a linked list. This allows |
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33 * extremely fine-grained locking, and so increases |
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34 * potential concurrency, at the cost of additional complexity and |
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35 * overhead that would normally make this worthwhile only in cases of |
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36 * extreme contention. |
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37 * <pre> |
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38 * class Node { |
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39 * Object item; |
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40 * Node next; |
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41 * Mutex lock = new Mutex(); // each node keeps its own lock |
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42 * |
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43 * Node(Object x, Node n) { item = x; next = n; } |
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44 * } |
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45 * |
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46 * class List { |
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47 * protected Node head; // pointer to first node of list |
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48 * |
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49 * // Use plain java synchronization to protect head field. |
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50 * // (We could instead use a Mutex here too but there is no |
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51 * // reason to do so.) |
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52 * protected synchronized Node getHead() { return head; } |
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53 * |
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54 * boolean search(Object x) throws InterruptedException { |
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55 * Node p = getHead(); |
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56 * if (p == null) return false; |
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57 * |
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58 * // (This could be made more compact, but for clarity of illustration, |
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59 * // all of the cases that can arise are handled separately.) |
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60 * |
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61 * p.lock.acquire(); // Prime loop by acquiring first lock. |
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62 * // (If the acquire fails due to |
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63 * // interrupt, the method will throw |
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64 * // InterruptedException now, |
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65 * // so there is no need for any |
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66 * // further cleanup.) |
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67 * for (;;) { |
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68 * if (x.equals(p.item)) { |
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69 * p.lock.release(); // release current before return |
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70 * return true; |
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71 * } |
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72 * else { |
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73 * Node nextp = p.next; |
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74 * if (nextp == null) { |
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75 * p.lock.release(); // release final lock that was held |
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76 * return false; |
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77 * } |
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78 * else { |
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79 * try { |
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80 * nextp.lock.acquire(); // get next lock before releasing current |
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81 * } |
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82 * catch (InterruptedException ex) { |
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83 * p.lock.release(); // also release current if acquire fails |
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84 * throw ex; |
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85 * } |
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86 * p.lock.release(); // release old lock now that new one held |
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87 * p = nextp; |
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88 * } |
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89 * } |
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90 * } |
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91 * } |
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92 * |
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93 * synchronized void add(Object x) { // simple prepend |
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94 * // The use of `synchronized' here protects only head field. |
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95 * // The method does not need to wait out other traversers |
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96 * // who have already made it past head. |
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97 * |
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98 * head = new Node(x, head); |
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99 * } |
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100 * |
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101 * // ... other similar traversal and update methods ... |
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102 * } |
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103 * </pre> |
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104 * <p> |
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105 * @see Semaphore |
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106 * <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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107 **/ |
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108 |
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109 public class Mutex implements Sync { |
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110 |
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111 /** The lock status **/ |
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112 protected boolean inuse_ = false; |
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113 |
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114 public void acquire() throws InterruptedException { |
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115 // if (Thread.interrupted()) throw new InterruptedException(); |
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116 synchronized(this) { |
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117 try { |
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118 while (inuse_) wait(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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119 inuse_ = true; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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120 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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121 catch (InterruptedException ex) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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122 notify(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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123 throw ex; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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124 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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125 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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126 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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127 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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128 public synchronized void release() { |
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129 if (inuse_ == false) |
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130 throw new RuntimeException("Not locked!!!!"); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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131 inuse_ = false; |
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132 notify(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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133 } |
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134 |
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135 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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136 public boolean attempt(long msecs) throws InterruptedException { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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137 // if (Thread.interrupted()) throw new InterruptedException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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138 synchronized(this) { |
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139 if (!inuse_) { |
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140 inuse_ = true; |
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141 return true; |
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142 } |
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143 else if (msecs <= 0) |
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144 return false; |
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145 else { |
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146 long waitTime = msecs; |
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147 long start = System.currentTimeMillis(); |
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148 try { |
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149 for (;;) { |
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150 wait(waitTime); |
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151 if (!inuse_) { |
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152 inuse_ = true; |
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153 return true; |
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154 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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155 else { |
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156 waitTime = msecs - (System.currentTimeMillis() - start); |
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157 if (waitTime <= 0) |
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158 return false; |
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159 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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160 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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161 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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162 catch (InterruptedException ex) { |
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163 notify(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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164 throw ex; |
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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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169 |
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170 } |
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171 |