1 /*
   2  * Copyright (c) 2005, 2015, 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  * @test
  26  * @bug     5086470 6358247
  27  * @summary Basic Test for ThreadInfo.getLockedSynchronizers()
  28  *          SynchronizerLockingThread is the class that creates threads
  29  *          and do the checking.
  30  *
  31  * @author  Mandy Chung
  32  *
  33  * @modules java.management
  34  * @build Barrier
  35  * @build SynchronizerLockingThread
  36  * @build ThreadDump
  37  * @run main/othervm LockedSynchronizers
  38  */
  39 
  40 import java.lang.management.*;
  41 import java.util.*;
  42 
  43 public class LockedSynchronizers {
  44     public static void main(String[] argv) throws Exception {
  45         ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
  46         if (!mbean.isSynchronizerUsageSupported()) {
  47             System.out.println("Monitoring of synchronizer usage not supported");
  48             return;
  49         }
  50 
  51         // Start thread and print thread dump
  52         SynchronizerLockingThread.startLockingThreads();
  53         ThreadDump.threadDump();
  54 
  55         // Test dumpAllThreads with locked monitors and synchronizers
  56         ThreadInfo[] tinfos = mbean.dumpAllThreads(true, true);
  57         SynchronizerLockingThread.checkLocks(tinfos);
  58 
  59         // Test getThreadInfo with locked monitors and synchronizers
  60         long[] ids = SynchronizerLockingThread.getThreadIds();
  61         tinfos = mbean.getThreadInfo(ids, true, true);
  62         if (tinfos.length != ids.length) {
  63             throw new RuntimeException("Number of ThreadInfo objects = " +
  64                 tinfos.length + " not matched. Expected: " + ids.length);
  65         }
  66 
  67         SynchronizerLockingThread.checkLocks(tinfos);
  68 
  69         System.out.println("Test passed");
  70     }
  71 }