Mercurial > projects > dwt2
annotate org.eclipse.core.jobs/src/org/eclipse/core/internal/jobs/ThreadJob.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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children | 6f068362a363 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2004, 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.ThreadJob; |
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14 |
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15 import java.lang.all; |
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16 import java.util.Set; |
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17 import tango.text.convert.Format; |
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18 import tango.io.Stdout; |
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19 import java.lang.JThread; |
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20 import tango.core.sync.Mutex; |
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21 import tango.core.sync.Condition; |
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22 |
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23 import org.eclipse.core.internal.runtime.RuntimeLog; |
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24 import org.eclipse.core.runtime.Assert; |
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25 import org.eclipse.core.runtime.IProgressMonitor; |
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26 import org.eclipse.core.runtime.IStatus; |
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27 import org.eclipse.core.runtime.OperationCanceledException; |
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28 import org.eclipse.core.runtime.Status; |
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29 import org.eclipse.core.runtime.jobs.ISchedulingRule; |
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30 import org.eclipse.core.runtime.jobs.Job; |
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31 import org.eclipse.core.internal.jobs.JobManager; |
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32 import org.eclipse.core.internal.jobs.InternalJob; |
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33 import org.eclipse.core.internal.jobs.LockManager; |
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34 |
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35 /** |
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36 * Captures the implicit job state for a given thread. |
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37 */ |
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38 class ThreadJob : Job { |
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39 /** |
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40 * The notifier is a shared object used to wake up waiting thread jobs |
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41 * when another job completes that is releasing a scheduling rule. |
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42 */ |
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43 |
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44 static const Mutex mutex; |
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45 static const Condition condition; |
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46 static this(){ |
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47 mutex = new Mutex(); |
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48 condition = new Condition(mutex); |
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49 } |
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50 |
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51 private const JobManager manager; |
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52 /** |
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53 * Set to true if this thread job is running in a thread that did |
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54 * not own a rule already. This means it needs to acquire the |
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55 * rule during beginRule, and must release the rule during endRule. |
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56 */ |
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57 /+protected+/ bool acquireRule = false; |
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58 |
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59 /** |
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60 * Indicates that this thread job did report to the progress manager |
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61 * that it will be blocked, and therefore when it begins it must |
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62 * be reported to the job manager when it is no longer blocked. |
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63 */ |
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64 bool isBlocked = false; |
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65 |
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66 /** |
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67 * True if this ThreadJob has begun execution |
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68 */ |
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69 /+protected+/ bool isRunning_ = false; |
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70 |
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71 /** |
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72 * Used for diagnosing mismatched begin/end pairs. This field |
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73 * is only used when in debug mode, to capture the stack trace |
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74 * of the last call to beginRule. |
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75 */ |
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76 private RuntimeException lastPush = null; |
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77 /** |
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78 * The actual job that is running in the thread that this |
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79 * ThreadJob represents. This will be null if this thread |
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80 * job is capturing a rule acquired outside of a job. |
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81 */ |
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82 protected package Job realJob; |
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83 /** |
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84 * The stack of rules that have been begun in this thread, but not yet ended. |
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85 */ |
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86 private ISchedulingRule[] ruleStack; |
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87 /** |
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88 * Rule stack pointer. |
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89 */ |
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90 private int top; |
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91 |
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92 this(JobManager manager, ISchedulingRule rule) { |
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93 super("Implicit Job"); //$NON-NLS-1$ |
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94 this.manager = manager; |
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95 setSystem(true); |
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96 setPriority(Job.INTERACTIVE); |
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97 ruleStack = new ISchedulingRule[2]; |
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98 top = -1; |
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99 setRule(rule); |
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100 } |
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101 |
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102 /** |
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103 * An endRule was called that did not match the last beginRule in |
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104 * the stack. Report and log a detailed informational message. |
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105 * @param rule The rule that was popped |
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106 */ |
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107 private void illegalPop(ISchedulingRule rule) { |
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108 StringBuffer buf = new StringBuffer("Attempted to endRule: "); //$NON-NLS-1$ |
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109 buf.append(Format("{}",rule)); |
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110 if (top >= 0 && top < ruleStack.length) { |
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111 buf.append(", does not match most recent begin: "); //$NON-NLS-1$ |
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112 buf.append(Format("{}",ruleStack[top])); |
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113 } else { |
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114 if (top < 0) |
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115 buf.append(", but there was no matching beginRule"); //$NON-NLS-1$ |
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116 else |
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117 buf.append( Format(", but the rule stack was out of bounds: {}", top)); //$NON-NLS-1$ |
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118 } |
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119 buf.append(". See log for trace information if rule tracing is enabled."); //$NON-NLS-1$ |
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120 String msg = buf.toString(); |
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121 if (JobManager.DEBUG || JobManager.DEBUG_BEGIN_END) { |
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122 Stdout.formatln("{}",msg); |
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123 Exception t = lastPush is null ? cast(Exception)new IllegalArgumentException("") : cast(Exception)lastPush; |
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124 IStatus error = new Status(IStatus.ERROR, JobManager.PI_JOBS, 1, msg, t); |
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125 RuntimeLog.log(error); |
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126 } |
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127 Assert.isLegal(false, msg); |
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128 } |
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129 |
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130 /** |
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131 * Client has attempted to begin a rule that is not contained within |
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132 * the outer rule. |
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133 */ |
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134 private void illegalPush(ISchedulingRule pushRule, ISchedulingRule baseRule) { |
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135 StringBuffer buf = new StringBuffer("Attempted to beginRule: "); //$NON-NLS-1$ |
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136 buf.append(Format("{}",pushRule)); |
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137 buf.append(", does not match outer scope rule: "); //$NON-NLS-1$ |
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138 buf.append(Format("{}",baseRule)); |
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139 String msg = buf.toString(); |
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140 if (JobManager.DEBUG) { |
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141 Stdout.formatln("{}",msg); |
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142 IStatus error = new Status(IStatus.ERROR, JobManager.PI_JOBS, 1, msg, new IllegalArgumentException("")); |
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143 RuntimeLog.log(error); |
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144 } |
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145 Assert.isLegal(false, msg); |
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146 |
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147 } |
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148 |
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149 /** |
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150 * Returns true if the monitor is canceled, and false otherwise. |
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151 * Protects the caller from exception in the monitor implementation. |
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152 */ |
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153 private bool isCanceled(IProgressMonitor monitor) { |
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154 try { |
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155 return monitor.isCanceled(); |
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156 } catch (RuntimeException e) { |
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157 //logged message should not be translated |
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158 IStatus status = new Status(IStatus.ERROR, JobManager.PI_JOBS, JobManager.PLUGIN_ERROR, "ThreadJob.isCanceled", e); //$NON-NLS-1$ |
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159 RuntimeLog.log(status); |
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160 } |
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161 return false; |
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162 } |
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163 |
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164 /** |
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165 * Returns true if this thread job was scheduled and actually started running. |
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166 */ |
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167 bool isRunning() { |
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168 synchronized(mutex){ |
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169 return isRunning_; |
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170 } |
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171 } |
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172 |
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173 /** |
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174 * Schedule the job and block the calling thread until the job starts running. |
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175 * Returns the ThreadJob instance that was started. |
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176 */ |
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177 ThreadJob joinRun(IProgressMonitor monitor) { |
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178 if (isCanceled(monitor)) |
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179 throw new OperationCanceledException(); |
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180 //check if there is a blocking thread before waiting |
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181 InternalJob blockingJob = manager.findBlockingJob_package(this); |
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182 JThread blocker = blockingJob is null ? null : blockingJob.getThread_package(); |
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183 ThreadJob result = this; |
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184 try { |
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185 //just return if lock listener decided to grant immediate access |
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186 if (manager.getLockManager().aboutToWait(blocker)) |
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187 return this; |
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188 try { |
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189 waitStart(monitor, blockingJob); |
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190 final JThread getThis = JThread.currentThread(); |
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191 while (true) { |
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192 if (isCanceled(monitor)) |
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193 throw new OperationCanceledException(); |
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194 //try to run the job |
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195 if (manager.runNow_package(this)) |
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196 return this; |
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197 //update blocking job |
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198 blockingJob = manager.findBlockingJob_package(this); |
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199 //the rule could have been transferred to this thread while we were waiting |
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200 blocker = blockingJob is null ? null : blockingJob.getThread_package(); |
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201 if (blocker is getThis && cast(ThreadJob)blockingJob ) { |
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202 //now we are just the nested acquire case |
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203 result = cast(ThreadJob) blockingJob; |
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204 result.push(getRule()); |
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205 result.isBlocked = this.isBlocked; |
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206 return result; |
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207 } |
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208 //just return if lock listener decided to grant immediate access |
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209 if (manager.getLockManager().aboutToWait(blocker)) |
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210 return this; |
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211 //must lock instance before calling wait |
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212 synchronized (mutex) { |
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213 try { |
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214 condition.wait(0.250); |
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215 } catch (InterruptedException e) { |
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216 //ignore |
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217 } |
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218 } |
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219 } |
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220 } finally { |
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221 if (this is result) |
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222 waitEnd(monitor); |
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223 } |
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224 } finally { |
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225 manager.getLockManager().aboutToRelease(); |
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226 } |
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227 } |
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228 |
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229 /** |
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230 * Pops a rule. Returns true if it was the last rule for this thread |
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231 * job, and false otherwise. |
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232 */ |
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233 bool pop(ISchedulingRule rule) { |
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234 if (top < 0 || ruleStack[top] !is rule) |
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235 illegalPop(rule); |
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236 ruleStack[top--] = null; |
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237 return top < 0; |
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238 } |
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239 |
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240 /** |
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241 * Adds a new scheduling rule to the stack of rules for this thread. Throws |
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242 * a runtime exception if the new rule is not compatible with the base |
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243 * scheduling rule for this thread. |
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244 */ |
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245 void push(ISchedulingRule rule) { |
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246 ISchedulingRule baseRule = getRule(); |
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247 if (++top >= ruleStack.length) { |
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248 ISchedulingRule[] newStack = new ISchedulingRule[ruleStack.length * 2]; |
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249 SimpleType!(ISchedulingRule).arraycopy(ruleStack, 0, newStack, 0, ruleStack.length); |
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250 ruleStack = newStack; |
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251 } |
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252 ruleStack[top] = rule; |
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253 if (JobManager.DEBUG_BEGIN_END) |
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254 lastPush = new RuntimeException()/+).fillInStackTrace()+/; |
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255 //check for containment last because we don't want to fail again on endRule |
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256 if (baseRule !is null && rule !is null && !baseRule.contains(rule)) |
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257 illegalPush(rule, baseRule); |
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258 } |
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259 |
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260 /** |
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261 * Reset all of this job's fields so it can be reused. Returns false if |
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262 * reuse is not possible |
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263 */ |
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264 bool recycle() { |
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265 //don't recycle if still running for any reason |
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266 if (getState() !is Job.NONE) |
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267 return false; |
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268 //clear and reset all fields |
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269 acquireRule = isRunning_ = isBlocked = false; |
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270 realJob = null; |
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271 setRule(null); |
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272 setThread(null); |
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273 if (ruleStack.length !is 2) |
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274 ruleStack = new ISchedulingRule[2]; |
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275 else |
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276 ruleStack[0] = ruleStack[1] = null; |
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277 top = -1; |
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278 return true; |
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279 } |
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280 |
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281 /** (non-Javadoc) |
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282 * @see org.eclipse.core.runtime.jobs.Job#run(org.eclipse.core.runtime.IProgressMonitor) |
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283 */ |
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284 public IStatus run(IProgressMonitor monitor) { |
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285 synchronized (this) { |
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286 isRunning_ = true; |
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287 } |
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288 return ASYNC_FINISH; |
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289 } |
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290 |
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291 /** |
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292 * Records the job that is actually running in this thread, if any |
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293 * @param realJob The running job |
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294 */ |
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295 void setRealJob(Job realJob) { |
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296 this.realJob = realJob; |
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297 } |
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298 |
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299 /** |
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300 * Returns true if this job should cause a self-canceling job |
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301 * to cancel itself, and false otherwise. |
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302 */ |
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303 bool shouldInterrupt() { |
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304 return realJob is null ? true : !realJob.isSystem(); |
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305 } |
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306 |
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307 /* (non-javadoc) |
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308 * For debugging purposes only |
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309 */ |
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310 public String toString() { |
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311 StringBuffer buf = new StringBuffer("ThreadJob"); //$NON-NLS-1$ |
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312 buf.append('(').append(Format("{}",realJob)).append(',').append('['); |
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313 for (int i = 0; i <= top && i < ruleStack.length; i++) |
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314 buf.append(Format("{}",ruleStack[i])).append(','); |
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315 buf.append(']').append(')'); |
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316 return buf.toString(); |
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317 } |
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318 |
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319 /** |
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320 * Reports that this thread was blocked, but is no longer blocked and is able |
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321 * to proceed. |
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322 * @param monitor The monitor to report unblocking to. |
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323 */ |
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324 private void waitEnd(IProgressMonitor monitor) { |
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325 final LockManager lockManager = manager.getLockManager(); |
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326 final JThread getThis = JThread.currentThread(); |
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327 if (isRunning()) { |
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328 lockManager.addLockThread(getThis, getRule()); |
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329 //need to re-acquire any locks that were suspended while this thread was blocked on the rule |
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330 lockManager.resumeSuspendedLocks(getThis); |
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331 } else { |
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332 //tell lock manager that this thread gave up waiting |
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333 lockManager.removeLockWaitThread(getThis, getRule()); |
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334 } |
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335 } |
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336 |
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337 /** |
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338 * Indicates the start of a wait on a scheduling rule. Report the |
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339 * blockage to the progress manager and update the lock manager. |
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340 * @param monitor The monitor to report blocking to |
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341 * @param blockingJob The job that is blocking this thread, or <code>null</code> |
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342 */ |
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343 private void waitStart(IProgressMonitor monitor, InternalJob blockingJob) { |
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344 manager.getLockManager().addLockWaitThread(JThread.currentThread(), getRule()); |
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345 isBlocked = true; |
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346 manager.reportBlocked(monitor, blockingJob); |
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347 } |
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348 } |