LingeredAppWithDeadlock.java revision 2224:2a8815d86b93 
1/*
2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23package jdk.test.lib.apps;
24
25import java.util.concurrent.Phaser;
26
27public class LingeredAppWithDeadlock extends LingeredApp {
28
29    private static final Object Lock1 = new Object();
30    private static final Object Lock2 = new Object();
31
32    private static volatile int reachCount = 0;
33
34    private static final Phaser p = new Phaser(2);
35
36    private static class ThreadOne extends Thread {
37        public void run() {
38            // wait Lock2 is locked
39            p.arriveAndAwaitAdvance();
40            synchronized (Lock1) {
41                // signal Lock1 is locked
42                p.arriveAndAwaitAdvance();
43                synchronized (Lock2) {
44                    reachCount += 1;
45                }
46            }
47        }
48    }
49
50    private static class ThreadTwo extends Thread {
51        public void run() {
52            synchronized (Lock2) {
53                // signal Lock2 is locked
54                p.arriveAndAwaitAdvance();
55                // wait Lock1 is locked
56                p.arriveAndAwaitAdvance();
57                synchronized (Lock1) {
58                    reachCount += 1;
59                }
60            }
61        }
62    }
63
64    public static void main(String args[]) {
65        if (args.length != 1) {
66            System.err.println("Lock file name is not specified");
67            System.exit(7);
68        }
69
70        // Run two theads that should come to deadlock
71        new ThreadOne().start();
72        new ThreadTwo().start();
73
74        if (reachCount > 0) {
75            // Not able to deadlock, exiting
76            System.exit(3);
77        }
78
79        LingeredApp.main(args);
80    }
81 }
82