1/*
2 * Copyright (c) 2007, 2012, 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 */
23/*
24 */
25package org.graalvm.compiler.jtt.threads;
26
27import org.graalvm.compiler.jtt.JTTTest;
28import org.graalvm.compiler.jtt.hotspot.NotOnDebug;
29import org.junit.Rule;
30import org.junit.Test;
31import org.junit.rules.TestRule;
32import org.junit.rules.Timeout;
33
34public final class Monitor_contended01 extends JTTTest {
35
36    @Rule public TestRule timeout = NotOnDebug.create(Timeout.seconds(20));
37
38    private static class TestClass implements Runnable {
39        boolean started = false;
40        boolean acquired = false;
41
42        @Override
43        public void run() {
44            // signal that we have started up so first thread will release lock
45            synchronized (cond) {
46                started = true;
47                cond.notifyAll();
48            }
49            synchronized (obj) {
50
51            }
52            // signal that we have successfully acquired and released the monitor
53            synchronized (cond) {
54                acquired = true;
55                cond.notifyAll();
56            }
57        }
58    }
59
60    static final Object cond = new Object();
61    static final Object obj = new Object();
62
63    public static boolean test() throws InterruptedException {
64        // test contention for monitor
65        final TestClass object = new TestClass();
66        synchronized (obj) {
67            new Thread(object).start();
68            // wait for other thread to startup and contend
69            synchronized (cond) {
70                cond.wait(1000);
71                if (!object.started) {
72                    return false;
73                }
74            }
75        }
76        // wait for other thread to acquire monitor and then exit
77        synchronized (cond) {
78            cond.wait(1000);
79        }
80        return object.acquired;
81    }
82
83    @Test
84    public void run0() throws Throwable {
85        initializeForTimeout();
86        runTest("test");
87    }
88
89}
90