--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/RunnableLock.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,41 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2007 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module dwt.widgets.RunnableLock;
+
+import dwt.dwthelper.utils;
+
+
+/**
+ * Instances of this class are used to ensure that an
+ * application cannot interfere with the locking mechanism
+ * used to implement asynchronous and synchronous communication
+ * between widgets and background threads.
+ */
+
+class RunnableLock {
+    Runnable runnable;
+    Thread thread;
+    Throwable throwable;
+    
+RunnableLock (Runnable runnable) {
+    this.runnable = runnable;
+}
+
+bool done () {
+    return runnable is null || throwable !is null;
+}
+
+void run () {
+    if (runnable !is null) runnable.run ();
+    runnable = null;
+}
+
+}