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annotate dwt/widgets/Synchronizer.d @ 45:d8635bb48c7c

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Merge with SWT 3.5
author Jacob Carlborg <doob@me.com>
date Mon, 01 Dec 2008 17:07:00 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <doob@me.com>
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13 *******************************************************************************/
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14 module dwt.widgets.Synchronizer;
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16
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17 import dwt.DWT;
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18 import dwt.DWTException;
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19 import dwt.graphics.Device;
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20 import dwt.internal.Compatibility;
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22 import tango.core.Thread;
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23 import tango.core.Exception;
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25 import dwt.dwthelper.Runnable;
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26 import dwt.dwthelper.utils;
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27 import dwt.widgets.Display;
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28 import dwt.widgets.RunnableLock;
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30 /**
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31 * Instances of this class provide synchronization support
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32 * for displays. A default instance is created automatically
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33 * for each display, and this instance is sufficient for almost
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34 * all applications.
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35 * <p>
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36 * <b>IMPORTANT:</b> Typical application code <em>never</em>
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37 * needs to deal with this class. It is provided only to
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38 * allow applications which require non-standard
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39 * synchronization behavior to plug in the support they
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40 * require. <em>Subclasses which override the methods in
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41 * this class must ensure that the superclass methods are
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42 * invoked in their implementations</em>
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43 * </p>
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44 *
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45 * @see Display#setSynchronizer
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46 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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47 */
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48 public class Synchronizer {
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49 Display display;
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50 int messageCount;
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51 RunnableLock [] messages;
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52 Object messageLock;
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53 Thread syncThread;
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54 static const int GROW_SIZE = 4;
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55 static const int MESSAGE_LIMIT = 64;
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56
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57 //TEMPORARY CODE
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58 static const bool IS_CARBON = "carbon".equals (DWT.getPlatform ());
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59
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60 /**
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61 * Constructs a new instance of this class.
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62 *
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63 * @param display the display to create the synchronizer on
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64 */
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65 public this (Display display) {
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66 this.display = display;
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67 messageLock = new Object ();
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68 }
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69
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70 void addLast (RunnableLock lock) {
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71 bool wake = false;
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72 synchronized (messageLock) {
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73 if (messages is null) messages = new RunnableLock [GROW_SIZE];
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74 if (messageCount is messages.length) {
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75 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE];
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76 System.arraycopy (messages, 0, newMessages, 0, messageCount);
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77 messages = newMessages;
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78 }
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79 messages [messageCount++] = lock;
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80 wake = messageCount is 1;
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81 }
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82 if (wake) display.wakeThread ();
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83 }
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84
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85 /**
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86 * Causes the <code>run()</code> method of the runnable to
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87 * be invoked by the user-interface thread at the next
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88 * reasonable opportunity. The caller of this method continues
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89 * to run in parallel, and is not notified when the
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90 * runnable has completed.
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91 *
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92 * @param runnable code to run on the user-interface thread.
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93 *
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94 * @see #syncExec
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95 */
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96 public void asyncExec (Runnable runnable) {
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97 if (runnable is null) {
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98 //TEMPORARY CODE
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99 if (!IS_CARBON) {
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100 display.wake ();
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101 return;
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102 }
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103 }
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104 addLast (new RunnableLock (runnable));
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105 }
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106
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107 int getMessageCount () {
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108 synchronized (messageLock) {
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109 return messageCount;
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110 }
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111 }
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112
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113 void releaseSynchronizer () {
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114 display = null;
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115 messages = null;
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116 messageLock = null;
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117 syncThread = null;
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118 }
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119
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120 RunnableLock removeFirst () {
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121 synchronized (messageLock) {
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122 if (messageCount is 0) return null;
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123 RunnableLock lock = messages [0];
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124 System.arraycopy (messages, 1, messages, 0, --messageCount);
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125 messages [messageCount] = null;
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126 if (messageCount is 0) {
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127 if (messages.length > MESSAGE_LIMIT) messages = null;
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128 }
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129 return lock;
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130 }
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131 }
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132
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133 bool runAsyncMessages () {
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134 return runAsyncMessages (false);
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135 }
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136
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137 bool runAsyncMessages (bool all) {
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138 bool run = false;
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139 do {
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140 RunnableLock lock = removeFirst ();
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141 if (lock is null) return run;
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142 run = true;
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143 synchronized (lock) {
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144 syncThread = lock.thread;
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145 try {
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146 lock.run ();
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147 } catch (Throwable t) {
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148 lock.throwable = t;
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149 DWT.error (DWT.ERROR_FAILED_EXEC, t);
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150 } finally {
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151 syncThread = null;
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152 lock.notifyAll ();
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153 }
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154 }
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155 } while (all);
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156 return run;
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157 }
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158
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159 /**
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160 * Causes the <code>run()</code> method of the runnable to
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161 * be invoked by the user-interface thread at the next
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162 * reasonable opportunity. The thread which calls this method
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163 * is suspended until the runnable completes.
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164 *
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165 * @param runnable code to run on the user-interface thread.
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166 *
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167 * @exception DWTException <ul>
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168 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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169 * </ul>
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170 *
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171 * @see #asyncExec
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172 */
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173 public void syncExec (Runnable runnable) {
0
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174 RunnableLock lock = null;
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175 synchronized (Device.classinfo) {
0
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176 if (display is null || display.isDisposed ()) DWT.error (DWT.ERROR_DEVICE_DISPOSED);
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177 if (!display.isValidThread ()) {
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178 if (runnable is null) {
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179 display.wake ();
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180 return;
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181 }
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182 lock = new RunnableLock (runnable);
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183 /*
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184 * Only remember the syncThread for syncExec.
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185 */
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186 lock.thread = Thread.getThis();
0
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187 addLast (lock);
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188 }
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189 }
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190 if (lock is null) {
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191 if (runnable !is null) runnable.run ();
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192 return;
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193 }
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194 synchronized (lock) {
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195 bool interrupted = false;
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196 while (!lock.done ()) {
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197 try {
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198 lock.wait ();
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199 } catch (InterruptedException e) {
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200 interrupted = true;
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201 }
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202 }
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203 if (interrupted) {
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204 Compatibility.interrupt();
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205 }
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206 if (lock.throwable !is null) {
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207 DWT.error (DWT.ERROR_FAILED_EXEC, lock.throwable);
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208 }
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209 }
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210 }
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211
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212 }