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