Mercurial > projects > dwt2
annotate org.eclipse.core.jobs/src/org/eclipse/core/internal/jobs/WorkerPool.d @ 17:6f068362a363
Remove direct import of tango.text.convert.Format
author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 18 Mar 2009 09:09:23 +0100 |
parents | bc29606a740c |
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1 /******************************************************************************* |
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2 * Copyright (c) 2003, 2007 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.WorkerPool; |
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14 |
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15 import java.lang.JThread; |
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16 import tango.core.sync.Mutex; |
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17 import tango.core.sync.Condition; |
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18 import java.lang.all; |
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19 import java.util.Set; |
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20 |
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21 import org.eclipse.core.runtime.Assert; |
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22 import org.eclipse.core.runtime.IStatus; |
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23 import org.eclipse.core.runtime.jobs.Job; |
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24 import org.eclipse.core.internal.jobs.JobManager; |
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25 import org.eclipse.core.internal.jobs.Worker; |
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26 |
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27 import org.eclipse.core.internal.jobs.InternalJob; |
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28 import org.eclipse.core.internal.jobs.ThreadJob; |
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29 |
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30 /** |
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31 * Maintains a pool of worker threads. Threads are constructed lazily as |
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32 * required, and are eventually discarded if not in use for awhile. This class |
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33 * maintains the thread creation/destruction policies for the job manager. |
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34 * |
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35 * Implementation note: all the data structures of this class are protected |
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36 * by the instance's object monitor. To avoid deadlock with third party code, |
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37 * this lock is never held when calling methods outside this class that may in |
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38 * turn use locks. |
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39 */ |
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40 class WorkerPool { |
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41 |
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42 protected Mutex mutex; |
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43 protected Condition condition; |
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44 |
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45 |
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46 /** |
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47 * Threads not used by their best before timestamp are destroyed. |
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48 */ |
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49 private static const int BEST_BEFORE = 60000; |
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50 /** |
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51 * There will always be at least MIN_THREADS workers in the pool. |
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52 */ |
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53 private static const int MIN_THREADS = 1; |
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54 /** |
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55 * Use the busy thread count to avoid starting new threads when a living |
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56 * thread is just doing house cleaning (notifying listeners, etc). |
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57 */ |
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58 private int busyThreads = 0; |
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59 |
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60 /** |
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61 * The default context class loader to use when creating worker threads. |
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62 */ |
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63 // protected const ClassLoader defaultContextLoader; |
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64 |
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65 /** |
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66 * Records whether new worker threads should be daemon threads. |
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67 */ |
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68 private bool isDaemon = false; |
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69 |
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70 private JobManager manager; |
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71 /** |
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72 * The number of workers in the threads array |
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73 */ |
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74 private int numThreads = 0; |
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75 /** |
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76 * The number of threads that are currently sleeping |
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77 */ |
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78 private int sleepingThreads = 0; |
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79 /** |
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80 * The living set of workers in this pool. |
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81 */ |
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82 private Worker[] threads; |
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83 |
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84 protected package this(JobManager manager) { |
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85 threads = new Worker[10]; |
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86 this.manager = manager; |
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87 mutex = new Mutex; |
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88 condition = new Condition(mutex); |
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89 // this.defaultContextLoader = Thread.currentThread().getContextClassLoader(); |
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90 } |
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91 |
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92 /** |
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93 * Adds a worker to the list of workers. |
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94 */ |
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95 private void add(Worker worker) { |
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96 synchronized(mutex){ |
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97 int size = threads.length; |
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98 if (numThreads + 1 > size) { |
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99 Worker[] newThreads = new Worker[2 * size]; |
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100 System.arraycopy(threads, 0, newThreads, 0, size); |
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101 threads = newThreads; |
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102 } |
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103 threads[numThreads++] = worker; |
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104 } |
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105 } |
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106 |
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107 private void decrementBusyThreads() { |
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108 synchronized(mutex){ |
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109 //impossible to have less than zero busy threads |
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110 if (--busyThreads < 0) { |
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111 if (JobManager.DEBUG) |
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112 Assert.isTrue(false, Integer.toString(busyThreads)); |
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113 busyThreads = 0; |
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114 } |
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115 } |
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116 } |
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117 |
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118 /** |
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119 * Signals the end of a job. Note that this method can be called under |
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120 * OutOfMemoryError conditions and thus must be paranoid about allocating objects. |
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121 */ |
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122 protected void endJob(InternalJob job, IStatus result) { |
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123 decrementBusyThreads(); |
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124 //need to end rule in graph before ending job so that 2 threads |
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125 //do not become the owners of the same rule in the graph |
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126 if ((job.getRule_package() !is null) && !(cast(ThreadJob)job )) { |
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127 //remove any locks this thread may be owning on that rule |
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128 manager.getLockManager().removeLockCompletely(JThread.currentThread(), job.getRule_package()); |
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129 } |
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130 manager.endJob_package(job, result, true); |
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131 //ensure this thread no longer owns any scheduling rules |
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132 manager.implicitJobs.endJob(job); |
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133 } |
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134 package void endJob_package(InternalJob job, IStatus result) { |
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135 endJob(job, result); |
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136 } |
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137 |
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138 /** |
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139 * Signals the death of a worker thread. Note that this method can be called under |
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140 * OutOfMemoryError conditions and thus must be paranoid about allocating objects. |
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141 */ |
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142 protected void endWorker(Worker worker) { |
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143 synchronized(mutex){ |
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144 if (remove(worker) && JobManager.DEBUG) |
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145 JobManager.debug_(Format("worker removed from pool: {}", worker)); //$NON-NLS-1$ |
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146 } |
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147 } |
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148 package void endWorker_package(Worker worker) { |
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149 endWorker(worker); |
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150 } |
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151 |
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152 private void incrementBusyThreads() { |
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153 synchronized(mutex){ |
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154 //impossible to have more busy threads than there are threads |
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155 if (++busyThreads > numThreads) { |
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156 if (JobManager.DEBUG) |
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157 Assert.isTrue(false, Format( "{},{}", busyThreads, numThreads)); |
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158 busyThreads = numThreads; |
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159 } |
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160 } |
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161 } |
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162 |
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163 /** |
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164 * Notification that a job has been added to the queue. Wake a worker, |
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165 * creating a new worker if necessary. The provided job may be null. |
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166 */ |
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167 protected package void jobQueued() { |
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168 synchronized(mutex){ |
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169 //if there is a sleeping thread, wake it up |
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170 if (sleepingThreads > 0) { |
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171 condition.notify(); |
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172 return; |
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173 } |
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174 //create a thread if all threads are busy |
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175 if (busyThreads >= numThreads) { |
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176 Worker worker = new Worker(this); |
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177 worker.setDaemon(isDaemon); |
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178 add(worker); |
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179 if (JobManager.DEBUG) |
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180 JobManager.debug_(Format("worker added to pool: {}", worker)); //$NON-NLS-1$ |
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181 worker.start(); |
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182 return; |
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183 } |
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184 } |
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185 } |
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186 |
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187 /** |
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188 * Remove a worker thread from our list. |
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189 * @return true if a worker was removed, and false otherwise. |
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190 */ |
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191 private bool remove(Worker worker) { |
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192 synchronized(mutex){ |
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193 for (int i = 0; i < threads.length; i++) { |
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194 if (threads[i] is worker) { |
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195 System.arraycopy(threads, i + 1, threads, i, numThreads - i - 1); |
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196 threads[--numThreads] = null; |
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197 return true; |
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198 } |
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199 } |
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200 return false; |
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201 } |
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202 } |
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203 |
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204 /** |
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205 * Sets whether threads created in the worker pool should be daemon threads. |
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206 */ |
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207 void setDaemon(bool value) { |
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208 this.isDaemon = value; |
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209 } |
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210 |
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211 protected void shutdown() { |
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212 synchronized(mutex){ |
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213 condition.notifyAll(); |
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214 } |
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215 } |
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216 package void shutdown_package() { |
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217 shutdown(); |
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218 } |
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219 |
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220 /** |
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221 * Sleep for the given duration or until woken. |
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222 */ |
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223 private void sleep(long duration) { |
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224 synchronized(mutex){ |
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225 sleepingThreads++; |
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226 busyThreads--; |
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227 if (JobManager.DEBUG) |
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228 JobManager.debug_(Format("worker sleeping for: {}ms", duration)); //$NON-NLS-1$ //$NON-NLS-2$ |
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229 try { |
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230 condition.wait(duration/1000.0f); |
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231 } catch (InterruptedException e) { |
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232 if (JobManager.DEBUG) |
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233 JobManager.debug_("worker interrupted while waiting... :-|"); //$NON-NLS-1$ |
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234 } finally { |
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235 sleepingThreads--; |
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236 busyThreads++; |
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237 } |
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238 } |
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239 } |
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240 |
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241 /** |
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242 * Returns a new job to run. Returns null if the thread should die. |
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243 */ |
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244 protected InternalJob startJob(Worker worker) { |
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245 //if we're above capacity, kill the thread |
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246 synchronized (mutex) { |
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247 if (!manager.isActive_package()) { |
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248 //must remove the worker immediately to prevent all threads from expiring |
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249 endWorker(worker); |
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250 return null; |
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251 } |
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252 //set the thread to be busy now in case of reentrant scheduling |
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253 incrementBusyThreads(); |
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254 } |
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255 Job job = null; |
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256 try { |
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257 job = manager.startJob_package(); |
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258 //spin until a job is found or until we have been idle for too long |
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259 long idleStart = System.currentTimeMillis(); |
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260 while (manager.isActive_package() && job is null) { |
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261 long hint = manager.sleepHint_package(); |
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262 if (hint > 0) |
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263 sleep(Math.min(hint, BEST_BEFORE)); |
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264 job = manager.startJob_package(); |
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265 //if we were already idle, and there are still no new jobs, then |
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266 // the thread can expire |
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267 synchronized (mutex) { |
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268 if (job is null && (System.currentTimeMillis() - idleStart > BEST_BEFORE) && (numThreads - busyThreads) > MIN_THREADS) { |
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269 //must remove the worker immediately to prevent all threads from expiring |
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270 endWorker(worker); |
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271 return null; |
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272 } |
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273 } |
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274 } |
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275 if (job !is null) { |
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276 //if this job has a rule, then we are essentially acquiring a lock |
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277 if ((job.getRule() !is null) && !(cast(ThreadJob)job )) { |
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278 //don't need to re-aquire locks because it was not recorded in the graph |
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279 //that this thread waited to get this rule |
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280 manager.getLockManager().addLockThread(JThread.currentThread(), job.getRule()); |
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281 } |
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282 //see if we need to wake another worker |
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283 if (manager.sleepHint_package() <= 0) |
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284 jobQueued(); |
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285 } |
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286 } finally { |
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287 //decrement busy thread count if we're not running a job |
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288 if (job is null) |
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289 decrementBusyThreads(); |
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290 } |
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291 return job; |
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292 } |
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293 package InternalJob startJob_package(Worker worker) { |
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294 return startJob(worker); |
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295 } |
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296 } |