Mercurial > projects > dwt-win
annotate dwt/widgets/Synchronizer.d @ 213:36f5cb12e1a2
Update to SWT 3.4M7
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 17 May 2008 17:34:28 +0200 |
parents | 3afcd4ddcf90 |
children | fd9c62a2998e |
rev | line source |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 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 Corporation - 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 dwt.widgets.Synchronizer; |
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14 |
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15 import dwt.widgets.Display; |
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16 import dwt.widgets.RunnableLock; |
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17 import dwt.dwthelper.Runnable; |
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18 import dwt.dwthelper.System; |
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19 import dwt.internal.Compatibility; |
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20 |
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21 import dwt.DWT; |
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22 import tango.core.Thread; |
213 | 23 import dwt.graphics.Device; |
31
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24 import tango.core.Exception; |
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25 |
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26 /** |
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27 * Instances of this class provide synchronization support |
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28 * for displays. A default instance is created automatically |
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29 * for each display, and this instance is sufficient for almost |
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30 * all applications. |
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31 * <p> |
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32 * <b>IMPORTANT:</b> Typical application code <em>never</em> |
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33 * needs to deal with this class. It is provided only to |
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34 * allow applications which require non-standard |
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35 * synchronization behavior to plug in the support they |
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36 * require. <em>Subclasses which override the methods in |
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37 * this class must ensure that the superclass methods are |
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38 * invoked in their implementations</em> |
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39 * </p> |
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40 * |
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41 * @see Display#setSynchronizer |
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42 */ |
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43 public class Synchronizer { |
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44 Display display; |
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45 int messageCount; |
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46 RunnableLock [] messages; |
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47 Object messageLock; |
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48 Thread syncThread; |
213 | 49 static final int GROW_SIZE = 4; |
50 static final int MESSAGE_LIMIT = 64; | |
31
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51 |
194 | 52 //TEMPORARY CODE |
53 static final bool IS_CARBON = false;//"carbon".equals (DWT.getPlatform ()); | |
54 | |
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55 /** |
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56 * Constructs a new instance of this class. |
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57 * |
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58 * @param display the display to create the synchronizer on |
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59 */ |
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60 public this (Display display) { |
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61 this.display = display; |
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62 messageLock = new Object (); |
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63 } |
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64 |
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65 void addLast (RunnableLock lock) { |
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66 bool wake = false; |
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67 synchronized (messageLock) { |
213 | 68 if (messages is null) messages = new RunnableLock [GROW_SIZE]; |
31
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69 if (messageCount is messages.length) { |
213 | 70 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE]; |
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71 System.arraycopy (messages, 0, newMessages, 0, messageCount); |
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72 messages = newMessages; |
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73 } |
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74 messages [messageCount++] = lock; |
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75 wake = messageCount is 1; |
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76 } |
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77 if (wake) display.wakeThread (); |
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78 } |
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79 |
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80 /** |
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81 * Causes the <code>run()</code> method of the runnable to |
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82 * be invoked by the user-interface thread at the next |
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83 * reasonable opportunity. The caller of this method continues |
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84 * to run in parallel, and is not notified when the |
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85 * runnable has completed. |
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86 * |
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87 * @param runnable code to run on the user-interface thread. |
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88 * |
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89 * @see #syncExec |
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90 */ |
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91 public void asyncExec (Runnable runnable) { |
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92 if (runnable is null) { |
194 | 93 //TEMPORARY CODE |
94 if (!IS_CARBON) { | |
95 display.wake (); | |
96 return; | |
97 } | |
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98 } |
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99 addLast (new RunnableLock (runnable)); |
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100 } |
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101 |
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102 int getMessageCount () { |
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103 synchronized (messageLock) { |
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104 return messageCount; |
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105 } |
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106 } |
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107 |
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108 void releaseSynchronizer () { |
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109 display = null; |
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110 messages = null; |
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111 messageLock = null; |
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112 syncThread = null; |
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113 } |
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114 |
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115 RunnableLock removeFirst () { |
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116 synchronized (messageLock) { |
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117 if (messageCount is 0) return null; |
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118 RunnableLock lock = messages [0]; |
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119 System.arraycopy (messages, 1, messages, 0, --messageCount); |
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120 messages [messageCount] = null; |
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121 if (messageCount is 0) { |
213 | 122 if (messages.length > MESSAGE_LIMIT) messages = null; |
31
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123 } |
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124 return lock; |
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125 } |
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126 } |
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127 |
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128 bool runAsyncMessages () { |
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129 return runAsyncMessages (false); |
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130 } |
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131 |
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132 bool runAsyncMessages (bool all) { |
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133 bool run = false; |
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134 do { |
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135 RunnableLock lock = removeFirst (); |
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136 if (lock is null) return run; |
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137 run = true; |
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138 synchronized (lock) { |
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139 syncThread = lock.thread; |
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140 try { |
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141 lock.run (); |
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142 } catch (Exception t) { |
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143 lock.throwable = t; |
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144 DWT.error (DWT.ERROR_FAILED_EXEC, t); |
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145 } finally { |
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146 syncThread = null; |
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147 lock.notifyAll (); |
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148 } |
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149 } |
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150 } while (all); |
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151 return run; |
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152 } |
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153 |
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154 /** |
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155 * Causes the <code>run()</code> method of the runnable to |
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156 * be invoked by the user-interface thread at the next |
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157 * reasonable opportunity. The thread which calls this method |
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158 * is suspended until the runnable completes. |
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159 * |
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160 * @param runnable code to run on the user-interface thread. |
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161 * |
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162 * @exception DWTException <ul> |
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163 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li> |
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164 * </ul> |
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165 * |
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166 * @see #asyncExec |
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167 */ |
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168 public void syncExec (Runnable runnable) { |
213 | 169 RunnableLock lock = null; |
170 synchronized (Device.classinfo) { | |
171 if (display is null || display.isDisposed ()) DWT.error (DWT.ERROR_DEVICE_DISPOSED); | |
172 if (!display.isValidThread ()) { | |
173 if (runnable is null) { | |
174 display.wake (); | |
175 return; | |
176 } | |
177 lock = new RunnableLock (runnable); | |
178 /* | |
179 * Only remember the syncThread for syncExec. | |
180 */ | |
181 lock.thread = Thread.getThis(); | |
182 addLast (lock); | |
183 } | |
184 } | |
185 if (lock is null) { | |
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186 if (runnable !is null) runnable.run (); |
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187 return; |
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188 } |
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189 synchronized (lock) { |
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190 bool interrupted = false; |
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191 while (!lock.done ()) { |
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192 try { |
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193 lock.wait (); |
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194 } catch (SyncException e) { |
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195 interrupted = true; |
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196 } |
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197 } |
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198 if (interrupted) { |
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199 Compatibility.interrupt(); |
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200 } |
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201 if (lock.throwable !is null) { |
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202 DWT.error (DWT.ERROR_FAILED_EXEC, lock.throwable); |
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203 } |
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204 } |
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205 } |
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206 |
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207 } |