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