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Java > Open Source Codes > com > caucho > util > CyclicBarrier


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.util;
30
31 /**
32  * Waits for n threads.
33  */
34 public class CyclicBarrier {
35   private int _parties;
36   private int _waiting;
37
38   public CyclicBarrier(int parties)
39   {
40     _parties = parties;
41   }
42   
43   /**
44    * Allocates the semaphore, returns true on success.
45    */
46   public int await()
47     throws InterruptedException JavaDoc
48   {
49     synchronized (this) {
50       if (++_waiting == _parties) {
51     _waiting = 0;
52     notifyAll();
53       }
54       else {
55     wait(600 * 1000);
56       }
57     }
58
59     return _parties;
60   }
61 }
62
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