01: //The contents of this file are subject to the Mozilla Public License Version 1.1
02: //(the "License"); you may not use this file except in compliance with the
03: //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
04: //
05: //Software distributed under the License is distributed on an "AS IS" basis,
06: //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
07: //for the specific language governing rights and
08: //limitations under the License.
09: //
10: //The Original Code is "The Columba Project"
11: //
12: //The Initial Developers of the Original Code are Frederik Dietz and Timo Stich.
13: //Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
14: //
15: //All Rights Reserved.
16: package org.columba.core.base;
17:
18: public class Mutex {
19: private boolean mutex;
20:
21: public Mutex() {
22: mutex = false;
23: }
24:
25: /**
26: *
27: * @return true the mutex was indeed taken anew, false if calling thread already had mutex.
28: */
29: public synchronized void lock() {
30: while (mutex) {
31: try {
32: wait();
33: } catch (InterruptedException e) {
34: if (Thread.currentThread().isInterrupted()) {
35: // gota go now
36: throw new RuntimeException(e);
37: }
38:
39: // else keep waiting
40: }
41: }
42:
43: mutex = true;
44: }
45:
46: public synchronized void release() {
47: mutex = false;
48: notify();
49: }
50: }
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