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 */ 25 package org.graalvm.compiler.jtt.threads; 26 27 import org.graalvm.compiler.jtt.JTTTest; 28 import org.junit.Test; 29 30 public final class Monitor_contended01 extends JTTTest { 31 32 private static class TestClass implements Runnable { 33 boolean started = false; 34 boolean acquired = false; 35 36 @Override 37 public void run() { 38 // signal that we have started up so first thread will release lock 39 synchronized (cond) { 40 started = true; 41 cond.notifyAll(); 42 } 43 synchronized (obj) { 44 45 } 46 // signal that we have successfully acquired and released the monitor 47 synchronized (cond) { 48 acquired = true; 49 cond.notifyAll(); 50 } 51 } 52 } 53 54 static final Object cond = new Object(); 55 static final Object obj = new Object(); 56 57 public static boolean test() throws InterruptedException { 58 // test contention for monitor 59 final TestClass object = new TestClass(); 60 synchronized (obj) { 61 new Thread(object).start(); 62 // wait for other thread to startup and contend 63 synchronized (cond) { 64 cond.wait(1000); 65 if (!object.started) { 66 return false; 67 } 68 } 69 } 70 // wait for other thread to acquire monitor and then exit 71 synchronized (cond) { 72 cond.wait(1000); 73 } 74 return object.acquired; 75 } 76 77 @Test(timeout = 20000) 78 public void run0() throws Throwable { 79 initializeForTimeout(); 80 runTest("test"); 81 } 82 83 }