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annotate org.eclipse.core.jobs/src/org/eclipse/core/internal/jobs/OrderedLock.d @ 19:52184e4b815c

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no more direct tango.core.Thread. Rename JThread to java.lang.Thread.
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 10:55:25 +0100
parents 735224fcc45f
children
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1 /*******************************************************************************
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2 * Copyright (c) 2003, 2006 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM - Initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.core.internal.jobs.OrderedLock;
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15 import java.lang.Thread;
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16 import java.lang.all;
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17 import java.util.Set;
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18
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19 import org.eclipse.core.runtime.Assert;
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20 import org.eclipse.core.runtime.jobs.ILock;
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21 import org.eclipse.core.runtime.jobs.ISchedulingRule;
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22
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23 import org.eclipse.core.internal.jobs.LockManager;
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24 import org.eclipse.core.internal.jobs.Queue;
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25 import org.eclipse.core.internal.jobs.Semaphore;
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27 /**
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28 * A lock used to control write access to an exclusive resource.
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29 *
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30 * The lock avoids circular waiting deadlocks by detecting the deadlocks
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31 * and resolving them through the suspension of all locks owned by one
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32 * of the threads involved in the deadlock. This makes it impossible for n such
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33 * locks to deadlock while waiting for each other. The downside is that this means
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34 * that during an interval when a process owns a lock, it can be forced
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35 * to give the lock up and wait until all locks it requires become
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36 * available. This removes the feature of exclusive access to the
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37 * resource in contention for the duration between acquire() and
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38 * release() calls.
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39 *
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40 * The lock implementation prevents starvation by granting the
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41 * lock in the same order in which acquire() requests arrive. In
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42 * this scheme, starvation is only possible if a thread retains
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43 * a lock indefinitely.
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44 */
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45 public class OrderedLock : ILock, ISchedulingRule {
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46
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47 private static const bool DEBUG = false;
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48 /**
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49 * Locks are sequentially ordered for debugging purposes.
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50 */
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51 private static int nextLockNumber = 0;
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52 /**
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53 * The thread of the operation that currently owns the lock.
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54 */
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55 private /+volatile+/ Thread currentOperationThread;
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56 /**
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57 * Records the number of successive acquires in the same
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58 * thread. The lock is released only when the depth
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59 * reaches zero.
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60 */
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61 private int depth;
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62 /**
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63 * The manager that implements the deadlock detection and resolution protocol.
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64 */
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65 private const LockManager manager;
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66 private const int number;
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67
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68 /**
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69 * Queue of semaphores for threads currently waiting
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70 * on the lock. This queue is not thread-safe, so access
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71 * to this queue must be synchronized on the lock instance.
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72 */
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73 private const Queue operations;
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74
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75 /**
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76 * Creates a new workspace lock.
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77 */
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78 this(LockManager manager) {
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79
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80 operations = new Queue();
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81
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82 this.manager = manager;
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83 this.number = nextLockNumber++;
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84 }
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85
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86 /* (non-Javadoc)
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87 * @see Locks.ILock#acquire()
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88 */
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89 public void acquire() {
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90 //spin until the lock is successfully acquired
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91 //NOTE: spinning here allows the UI thread to service pending syncExecs
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92 //if the UI thread is waiting to acquire a lock.
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93 while (true) {
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94 try {
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95 if (acquire(Long.MAX_VALUE))
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96 return;
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97 } catch (InterruptedException e) {
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98 //ignore and loop
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99 }
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100 }
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101 }
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102
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103 /* (non-Javadoc)
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104 * @see Locks.ILock#acquire(long)
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105 */
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106 public bool acquire(long delay) {
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107 implMissing(__FILE__, __LINE__ );
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108 // if (Thread.interrupted())
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109 // throw new InterruptedException();
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110
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111 bool success = false;
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112 if (delay <= 0)
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113 return attempt();
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114 Semaphore semaphore = createSemaphore();
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115 if (semaphore is null)
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116 return true;
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117 if (DEBUG)
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118 getDwtLogger.info( __FILE__, __LINE__, "[{}] Operation waiting to be executed... ", Thread.currentThread(), this); //$NON-NLS-1$ //$NON-NLS-2$
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119 success = doAcquire(semaphore, delay);
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120 manager.resumeSuspendedLocks(Thread.currentThread());
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121 if (DEBUG && success)
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122 getDwtLogger.info( __FILE__, __LINE__, "[{}] Operation started... ", Thread.currentThread(), this); //$NON-NLS-1$ //$NON-NLS-2$
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123 else if (DEBUG)
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124 getDwtLogger.info( __FILE__, __LINE__, "[{}] Operation timed out... ", Thread.currentThread(), this); //$NON-NLS-1$ //$NON-NLS-2$
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125 return success;
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126 }
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127
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128 /**
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129 * Attempts to acquire the lock. Returns false if the lock is not available and
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130 * true if the lock has been successfully acquired.
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131 */
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132 private synchronized bool attempt() {
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133 //return true if we already own the lock
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134 //also, if nobody is waiting, grant the lock immediately
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135 if ((currentOperationThread is Thread.currentThread()) || (currentOperationThread is null && operations.isEmpty())) {
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136 depth++;
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137 setCurrentOperationThread(Thread.currentThread());
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138 return true;
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139 }
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140 return false;
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141 }
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142
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143 /* (non-Javadoc)
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144 * @see org.eclipse.core.runtime.jobs.ISchedulingRule#contains(org.eclipse.core.runtime.jobs.ISchedulingRule)
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145 */
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146 public bool contains(ISchedulingRule rule) {
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147 return false;
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148 }
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149
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150 /**
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151 * Returns null if acquired and a Semaphore object otherwise. If a
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152 * waiting semaphore already exists for this thread, it will be returned,
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153 * otherwise a new semaphore will be created, enqueued, and returned.
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154 */
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155 private synchronized Semaphore createSemaphore() {
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156 return attempt() ? null : enqueue(new Semaphore(Thread.currentThread()));
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157 }
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158
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159 /**
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160 * Attempts to acquire this lock. Callers will block until this lock comes available to
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161 * them, or until the specified delay has elapsed.
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162 */
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163 private bool doAcquire(Semaphore semaphore, long delay) {
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164 bool success = false;
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165 //notify hook to service pending syncExecs before falling asleep
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166 if (manager.aboutToWait(this.currentOperationThread)) {
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167 //hook granted immediate access
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168 //remove semaphore for the lock request from the queue
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169 //do not log in graph because this thread did not really get the lock
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170 removeFromQueue(semaphore);
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171 depth++;
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172 manager.addLockThread(currentOperationThread, this);
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173 return true;
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174 }
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175 //Make sure the semaphore is in the queue before we start waiting
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176 //It might have been removed from the queue while servicing syncExecs
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177 //This is will return our existing semaphore if it is still in the queue
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178 semaphore = createSemaphore();
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179 if (semaphore is null)
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180 return true;
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181 manager.addLockWaitThread(Thread.currentThread(), this);
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182 try {
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183 success = semaphore.acquire(delay);
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184 } catch (InterruptedException e) {
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185 if (DEBUG)
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186 getDwtLogger.info( __FILE__, __LINE__, Format("[{}] Operation interrupted while waiting... :-|", Thread.currentThread())); //$NON-NLS-1$ //$NON-NLS-2$
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187 throw e;
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188 }
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189 if (success) {
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190 depth++;
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191 updateCurrentOperation();
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192 } else {
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193 removeFromQueue(semaphore);
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194 manager.removeLockWaitThread(Thread.currentThread(), this);
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195 }
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196 return success;
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197 }
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198
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199 /**
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200 * Releases this lock from the thread that used to own it.
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201 * Grants this lock to the next thread in the queue.
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202 */
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203 private synchronized void doRelease() {
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204 //notify hook
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205 manager.aboutToRelease();
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206 depth = 0;
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207 Semaphore next = cast(Semaphore) operations.peek();
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208 setCurrentOperationThread(null);
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209 if (next !is null)
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210 next.release();
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211 }
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212
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213 /**
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214 * If there is another semaphore with the same runnable in the
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215 * queue, the other is returned and the new one is not added.
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216 */
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217 private synchronized Semaphore enqueue(Semaphore newSemaphore) {
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218 Semaphore semaphore = cast(Semaphore) operations.get(newSemaphore);
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219 if (semaphore is null) {
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220 operations.enqueue(newSemaphore);
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221 return newSemaphore;
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222 }
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223 return semaphore;
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224 }
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225
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226 /**
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227 * Suspend this lock by granting the lock to the next lock in the queue.
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228 * Return the depth of the suspended lock.
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229 */
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230 protected int forceRelease() {
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231 int oldDepth = depth;
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232 doRelease();
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233 return oldDepth;
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234 }
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235 package int forceRelease_package() {
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236 return forceRelease();
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237 }
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238
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239 /* (non-Javadoc)
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240 * @see Locks.ILock#getDepth()
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241 */
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242 public int getDepth() {
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243 return depth;
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244 }
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245
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246 /* (non-Javadoc)
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247 * @see org.eclipse.core.runtime.jobs.ISchedulingRule#isConflicting(org.eclipse.core.runtime.jobs.ISchedulingRule)
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248 */
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249 public bool isConflicting(ISchedulingRule rule) {
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250 return rule is this;
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251 }
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252
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253 /* (non-Javadoc)
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254 * @see Locks.ILock#release()
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255 */
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256 public void release() {
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257 if (depth is 0)
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258 return;
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259 //only release the lock when the depth reaches zero
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260 Assert.isTrue(depth >= 0, "Lock released too many times"); //$NON-NLS-1$
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261 if (--depth is 0)
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262 doRelease();
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263 else
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264 manager.removeLockThread(currentOperationThread, this);
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265 }
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266
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267 /**
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268 * Removes a semaphore from the queue of waiting operations.
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269 *
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270 * @param semaphore The semaphore to remove
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271 */
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272 private synchronized void removeFromQueue(Semaphore semaphore) {
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273 operations.remove(semaphore);
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274 }
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275
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276 /**
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277 * If newThread is null, release this lock from its previous owner.
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278 * If newThread is not null, grant this lock to newThread.
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279 */
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diff changeset
280 private void setCurrentOperationThread(Thread newThread) {
12
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281 if ((currentOperationThread !is null) && (newThread is null))
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282 manager.removeLockThread(currentOperationThread, this);
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283 this.currentOperationThread = newThread;
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284 if (currentOperationThread !is null)
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285 manager.addLockThread(currentOperationThread, this);
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286 }
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287
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288 /**
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289 * Forces the lock to be at the given depth.
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290 * Used when re-acquiring a suspended lock.
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291 */
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292 protected void setDepth(int newDepth) {
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293 for (int i = depth; i < newDepth; i++) {
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294 manager.addLockThread(currentOperationThread, this);
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295 }
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296 this.depth = newDepth;
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297 }
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298 package void setDepth_package(int newDepth) {
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299 return setDepth(newDepth);
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300 }
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301
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302 /**
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303 * For debugging purposes only.
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304 */
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305 public String toString() {
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306 return Format("OrderedLock ({})", number ); //$NON-NLS-1$ //$NON-NLS-2$
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307 }
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308
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309 /**
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310 * This lock has just been granted to a new thread (the thread waited for it).
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311 * Remove the request from the queue and update both the graph and the lock.
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312 */
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313 private synchronized void updateCurrentOperation() {
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314 operations.dequeue();
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315 setCurrentOperationThread(Thread.currentThread());
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316 }
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317 }