1 files changed, 39 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/RunnableLock.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/RunnableLock.java
new file mode 100755
index 0000000000..40a0e6b2b7
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/RunnableLock.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+package org.eclipse.swt.widgets;
+
+
+/**
+ * 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;
+}
+
+boolean done () {
+	return runnable == null || throwable != null;
+}
+
+void run () {
+	if (runnable != null) runnable.run ();
+	runnable = null;
+}
+
+}