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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/widgets/Synchronizer.d @ 0:6dd524f61e62

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add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
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children 52184e4b815c
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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 * 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.swt.widgets.Synchronizer;
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14
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15 import org.eclipse.swt.widgets.Display;
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16 import org.eclipse.swt.widgets.RunnableLock;
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17 import java.lang.Runnable;
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18 import java.lang.System;
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19 import org.eclipse.swt.internal.Compatibility;
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20
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21 import org.eclipse.swt.SWT;
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22 import tango.core.Thread;
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23 import org.eclipse.swt.graphics.Device;
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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 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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43 */
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44 public class Synchronizer {
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45 Display display;
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46 int messageCount;
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47 RunnableLock [] messages;
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48 Object messageLock;
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49 Thread syncThread;
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50 static final int GROW_SIZE = 4;
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51 static final int MESSAGE_LIMIT = 64;
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52
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53 //TEMPORARY CODE
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54 static final bool IS_CARBON = false;//"carbon".equals (SWT.getPlatform ());
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55
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56 /**
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57 * Constructs a new instance of this class.
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58 *
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59 * @param display the display to create the synchronizer on
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60 */
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61 public this (Display display) {
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62 this.display = display;
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63 messageLock = new Object ();
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64 }
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65
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66 void addLast (RunnableLock lock) {
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67 bool wake = false;
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68 synchronized (messageLock) {
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69 if (messages is null) messages = new RunnableLock [GROW_SIZE];
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70 if (messageCount is messages.length) {
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71 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE];
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72 System.arraycopy (messages, 0, newMessages, 0, messageCount);
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73 messages = newMessages;
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74 }
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75 messages [messageCount++] = lock;
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76 wake = messageCount is 1;
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77 }
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78 if (wake) display.wakeThread ();
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79 }
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80
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81 /**
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82 * Causes the <code>run()</code> method of the runnable to
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83 * be invoked by the user-interface thread at the next
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84 * reasonable opportunity. The caller of this method continues
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85 * to run in parallel, and is not notified when the
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86 * runnable has completed.
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87 *
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88 * @param runnable code to run on the user-interface thread.
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89 *
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90 * @see #syncExec
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91 */
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92 public void asyncExec (Runnable runnable) {
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93 if (runnable is null) {
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94 //TEMPORARY CODE
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95 if (!IS_CARBON) {
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96 display.wake ();
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97 return;
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98 }
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99 }
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100 addLast (new RunnableLock (runnable));
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101 }
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102
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103 int getMessageCount () {
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104 synchronized (messageLock) {
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105 return messageCount;
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106 }
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107 }
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108
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109 void releaseSynchronizer () {
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110 display = null;
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111 messages = null;
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112 messageLock = null;
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113 syncThread = null;
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114 }
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115
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116 RunnableLock removeFirst () {
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117 synchronized (messageLock) {
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118 if (messageCount is 0) return null;
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119 RunnableLock lock = messages [0];
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120 System.arraycopy (messages, 1, messages, 0, --messageCount);
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121 messages [messageCount] = null;
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122 if (messageCount is 0) {
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123 if (messages.length > MESSAGE_LIMIT) messages = null;
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124 }
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125 return lock;
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126 }
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127 }
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128
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129 bool runAsyncMessages () {
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130 return runAsyncMessages (false);
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131 }
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132
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133 bool runAsyncMessages (bool all) {
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134 bool run = false;
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135 do {
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136 RunnableLock lock = removeFirst ();
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137 if (lock is null) return run;
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138 run = true;
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139 synchronized (lock) {
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140 syncThread = lock.thread;
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141 try {
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142 lock.run ();
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143 } catch (Exception t) {
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144 lock.throwable = t;
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145 SWT.error (SWT.ERROR_FAILED_EXEC, t);
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146 } finally {
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147 syncThread = null;
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148 lock.notifyAll ();
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149 }
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150 }
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151 } while (all);
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152 return run;
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153 }
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154
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155 /**
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156 * Causes the <code>run()</code> method of the runnable to
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157 * be invoked by the user-interface thread at the next
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158 * reasonable opportunity. The thread which calls this method
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159 * is suspended until the runnable completes.
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160 *
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161 * @param runnable code to run on the user-interface thread.
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162 *
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163 * @exception SWTException <ul>
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164 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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165 * </ul>
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166 *
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167 * @see #asyncExec
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168 */
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169 public void syncExec (Runnable runnable) {
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170 RunnableLock lock = null;
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171 synchronized (Device.classinfo) {
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172 if (display is null || display.isDisposed ()) SWT.error (SWT.ERROR_DEVICE_DISPOSED);
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173 if (!display.isValidThread ()) {
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174 if (runnable is null) {
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175 display.wake ();
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176 return;
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177 }
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178 lock = new RunnableLock (runnable);
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179 /*
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180 * Only remember the syncThread for syncExec.
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181 */
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182 lock.thread = Thread.getThis();
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183 addLast (lock);
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184 }
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185 }
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186 if (lock is null) {
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187 if (runnable !is null) runnable.run ();
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188 return;
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189 }
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190 synchronized (lock) {
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191 bool interrupted = false;
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192 while (!lock.done ()) {
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193 try {
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194 lock.wait ();
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195 } catch (SyncException e) {
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196 interrupted = true;
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197 }
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198 }
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199 if (interrupted) {
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200 Compatibility.interrupt();
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201 }
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202 if (lock.throwable !is null) {
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203 SWT.error (SWT.ERROR_FAILED_EXEC, lock.throwable);
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204 }
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205 }
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206 }
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207
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208 }