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 }