1 /*
   2  * Copyright (c) 2017, 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 /**
  26  * @test
  27  * @summary Verifies the JVMTI GetOwnedMonitorInfo API
  28  * @modules jdk.jdi
  29  * @compile GetOwnedMonitorInfoTest.java
  30  * @run main/othervm/native -agentlib:GetOwnedMonitorInfoTest GetOwnedMonitorInfoTest
  31  */
  32 
  33 import java.io.PrintStream;
  34 
  35 public class GetOwnedMonitorInfoTest implements Runnable {
  36 
  37     static {
  38         try {
  39             System.loadLibrary("GetOwnedMonitorInfoTest");
  40         } catch (UnsatisfiedLinkError ule) {
  41             System.err.println("Could not load GetOwnedMonitorInfoTest library");
  42             System.err.println("java.library.path: "
  43                 + System.getProperty("java.library.path"));
  44             throw ule;
  45         }
  46     }
  47 
  48     native static int check();
  49     native static boolean hasEventPosted();
  50 
  51     public void run() {
  52         String name = Thread.currentThread().getName();
  53         try {
  54             synchronized (GetOwnedMonitorInfoTest.class) {
  55                 System.out.println("Thread in sync section: " + name);
  56             }
  57         } catch (Exception e) {
  58             e.printStackTrace();
  59         }
  60     }
  61 
  62     public static void main(String[] args) throws Exception {
  63         Thread t1 = new Thread(new GetOwnedMonitorInfoTest());
  64 
  65         // Make sure t1 contends on the monitor.
  66         synchronized (GetOwnedMonitorInfoTest.class) {
  67             System.out.println("Main starting worker thread.");
  68             t1.start();
  69 
  70             // Wait for the MonitorContendedEnter event
  71             while (!hasEventPosted()) {
  72                 System.out.println("Main waiting for event.");
  73                 Thread.sleep(100);
  74             }
  75         }
  76 
  77         t1.join();
  78 
  79         int status = check();
  80         if (status != 0) {
  81             throw new RuntimeException("FAILED status returned from the agent");
  82         }
  83     }
  84 }