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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/widgets/Synchronizer.d @ 112:9f4c18c268b2

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Update to compile and execute with dmd 2.052.
author kntroh
date Wed, 16 Mar 2011 21:53:53 +0900
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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 org.eclipse.swt.internal.Compatibility;
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18 import org.eclipse.swt.graphics.Device;
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19
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20 import org.eclipse.swt.SWT;
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21
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22 import java.lang.all;
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23 import java.lang.Thread;
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24
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25 version(Tango){
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26 import tango.core.Exception: SyncException;
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27 } else { // Phobos
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28 import core.sync.exception: SyncException;
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29 }
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30
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31 /**
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32 * Instances of this class provide synchronization support
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33 * for displays. A default instance is created automatically
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34 * for each display, and this instance is sufficient for almost
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35 * all applications.
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36 * <p>
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37 * <b>IMPORTANT:</b> Typical application code <em>never</em>
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38 * needs to deal with this class. It is provided only to
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39 * allow applications which require non-standard
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40 * synchronization behavior to plug in the support they
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41 * require. <em>Subclasses which override the methods in
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42 * this class must ensure that the superclass methods are
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43 * invoked in their implementations</em>
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44 * </p>
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45 *
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46 * @see Display#setSynchronizer
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47 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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48 */
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49 public class Synchronizer {
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50 Display display;
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51 int messageCount;
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52 RunnableLock [] messages;
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53 Object messageLock;
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54 Thread syncThread;
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55 static const int GROW_SIZE = 4;
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56 static const int MESSAGE_LIMIT = 64;
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57
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58 //TEMPORARY CODE
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59 static const bool IS_CARBON = false;//"carbon".equals (SWT.getPlatform ());
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60
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61 /**
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62 * Constructs a new instance of this class.
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63 *
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64 * @param display the display to create the synchronizer on
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65 */
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66 public this (Display display) {
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67 this.display = display;
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68 messageLock = new Object ();
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69 }
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70
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71 void addLast (RunnableLock lock) {
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72 bool wake = false;
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73 synchronized (messageLock) {
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74 if (messages is null) messages = new RunnableLock [GROW_SIZE];
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75 if (messageCount is messages.length) {
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76 RunnableLock[] newMessages = new RunnableLock [messageCount + GROW_SIZE];
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77 System.arraycopy (messages, 0, newMessages, 0, messageCount);
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78 messages = newMessages;
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79 }
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80 messages [messageCount++] = lock;
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81 wake = messageCount is 1;
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82 }
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83 if (wake) display.wakeThread ();
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84 }
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85
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86 /**
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87 * Causes the <code>run()</code> method of the runnable to
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88 * be invoked by the user-interface thread at the next
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89 * reasonable opportunity. The caller of this method continues
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90 * to run in parallel, and is not notified when the
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91 * runnable has completed.
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92 *
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93 * @param runnable code to run on the user-interface thread.
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94 *
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95 * @see #syncExec
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96 */
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97 public void asyncExec (Runnable runnable) {
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98 if (runnable is null) {
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99 //TEMPORARY CODE
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100 if (!IS_CARBON) {
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101 display.wake ();
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102 return;
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103 }
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104 }
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105 addLast (new RunnableLock (runnable));
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106 }
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107
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108 int getMessageCount () {
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109 synchronized (messageLock) {
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110 return messageCount;
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111 }
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112 }
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113
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114 void releaseSynchronizer () {
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115 display = null;
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116 messages = null;
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117 messageLock = null;
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118 syncThread = null;
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119 }
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120
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121 RunnableLock removeFirst () {
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122 synchronized (messageLock) {
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123 if (messageCount is 0) return null;
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124 RunnableLock lock = messages [0];
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125 System.arraycopy (messages, 1, messages, 0, --messageCount);
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126 messages [messageCount] = null;
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127 if (messageCount is 0) {
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128 if (messages.length > MESSAGE_LIMIT) messages = null;
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129 }
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130 return lock;
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131 }
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132 }
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133
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134 bool runAsyncMessages () {
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135 return runAsyncMessages (false);
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136 }
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137
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138 bool runAsyncMessages (bool all) {
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139 bool run = false;
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140 do {
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141 RunnableLock lock = removeFirst ();
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142 if (lock is null) return run;
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143 run = true;
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144 synchronized (lock) {
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145 syncThread = lock.thread;
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146 try {
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147 lock.run ();
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148 } catch (Exception t) {
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149 lock.throwable = t;
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150 SWT.error (SWT.ERROR_FAILED_EXEC, t);
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151 } finally {
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152 syncThread = null;
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153 lock.notifyAll ();
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154 }
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155 }
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156 } while (all);
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157 return run;
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158 }
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159
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160 /**
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161 * Causes the <code>run()</code> method of the runnable to
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162 * be invoked by the user-interface thread at the next
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163 * reasonable opportunity. The thread which calls this method
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164 * is suspended until the runnable completes.
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165 *
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166 * @param runnable code to run on the user-interface thread.
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167 *
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168 * @exception SWTException <ul>
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169 * <li>ERROR_FAILED_EXEC - if an exception occurred when executing the runnable</li>
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170 * </ul>
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171 *
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172 * @see #asyncExec
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173 */
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174 public void syncExec (Runnable runnable) {
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175 RunnableLock lock = null;
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176 synchronized (Device.classinfo) {
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177 if (display is null || display.isDisposed ()) SWT.error (SWT.ERROR_DEVICE_DISPOSED);
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178 if (!display.isValidThread ()) {
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179 if (runnable is null) {
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180 display.wake ();
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181 return;
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182 }
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183 lock = new RunnableLock (runnable);
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184 /*
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185 * Only remember the syncThread for syncExec.
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186 */
19
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187 lock.thread = Thread.currentThread();
0
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188 addLast (lock);
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189 }
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190 }
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191 if (lock is null) {
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192 if (runnable !is null) runnable.run ();
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193 return;
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194 }
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195 synchronized (lock) {
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196 bool interrupted = false;
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197 while (!lock.done ()) {
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198 try {
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199 lock.wait ();
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200 } catch (SyncException e) {
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201 interrupted = true;
0
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202 }
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203 }
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204 if (interrupted) {
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205 Compatibility.interrupt();
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206 }
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207 if (lock.throwable !is null) {
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208 SWT.error (SWT.ERROR_FAILED_EXEC, lock.throwable);
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209 }
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210 }
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211 }
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212
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213 }