/******************************************************************************* * Copyright (c) 2000, 2003 IBM Corporation and others. * All rights reserved. This program and the accompanying materials  * are made available under the terms of the Common Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/cpl-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 asynchonous 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;}}