RunnableLock


1   /*******************************************************************************
2    * Copyright (c) 2000, 2007 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.swt.widgets;
12  
13  
14  /**
15   * Instances of this class are used to ensure that an
16   * application cannot interfere with the locking mechanism
17   * used to implement asynchronous and synchronous communication
18   * between widgets and background threads.
19   */
20  
21  class RunnableLock {
22      Runnable   runnable;
23      Thread   thread;
24      Throwable   throwable;
25      
26  RunnableLock (Runnable   runnable) {
27      this.runnable = runnable;
28  }
29  
30  boolean done () {
31      return runnable == null || throwable != null;
32  }
33  
34  void run () {
35      if (runnable != null) runnable.run ();
36      runnable = null;
37  }
38  
39  }
40

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