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Java > Open Source Codes > soot > dava > toolkits > base > DavaMonitor > Lock


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2003 Jerome Miecznikowski
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 package soot.dava.toolkits.base.DavaMonitor;
21
22 import java.util.LinkedList JavaDoc;
23
24 class Lock
25 {
26     public Thread JavaDoc owner;
27     public int level;
28
29     private LinkedList JavaDoc q;
30
31     Lock()
32     {
33     level = 0;
34     owner = null;
35     q = new LinkedList JavaDoc();
36     }
37
38     public Thread JavaDoc nextThread()
39     {
40     return (Thread JavaDoc) q.getFirst();
41     }
42
43     public Thread JavaDoc deQ( Thread JavaDoc t) throws IllegalMonitorStateException JavaDoc
44     {
45     if (t != q.getFirst())
46         throw new IllegalMonitorStateException JavaDoc();
47
48     return (Thread JavaDoc) q.removeFirst();
49     }
50
51     public void enQ( Thread JavaDoc t)
52     {
53     q.add( t);
54     }
55 }
56
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