001/*
002 * Copyright (c) 2007, 2012, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.
008 *
009 * This code is distributed in the hope that it will be useful, but WITHOUT
010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
011 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
012 * version 2 for more details (a copy is included in the LICENSE file that
013 * accompanied this code).
014 *
015 * You should have received a copy of the GNU General Public License version
016 * 2 along with this work; if not, write to the Free Software Foundation,
017 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
018 *
019 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
020 * or visit www.oracle.com if you need additional information or have any
021 * questions.
022 */
023/*
024 */
025package com.oracle.graal.jtt.threads;
026
027import org.junit.*;
028
029import com.oracle.graal.jtt.*;
030
031public final class Monitor_contended01 extends JTTTest {
032
033    private static class TestClass implements Runnable {
034        boolean started = false;
035        boolean acquired = false;
036
037        public void run() {
038            // signal that we have started up so first thread will release lock
039            synchronized (cond) {
040                started = true;
041                cond.notifyAll();
042            }
043            synchronized (obj) {
044
045            }
046            // signal that we have successfully acquired and released the monitor
047            synchronized (cond) {
048                acquired = true;
049                cond.notifyAll();
050            }
051        }
052    }
053
054    static final Object cond = new Object();
055    static final Object obj = new Object();
056
057    public static boolean test() throws InterruptedException {
058        // test contention for monitor
059        final TestClass object = new TestClass();
060        synchronized (obj) {
061            new Thread(object).start();
062            // wait for other thread to startup and contend
063            synchronized (cond) {
064                cond.wait(1000);
065                if (!object.started) {
066                    return false;
067                }
068            }
069        }
070        // wait for other thread to acquire monitor and then exit
071        synchronized (cond) {
072            cond.wait(1000);
073        }
074        return object.acquired;
075    }
076
077    @Test(timeout = 20000)
078    public void run0() throws Throwable {
079        runTest("test");
080    }
081
082}