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/*
* Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 5086470 6358247
* @summary Basic Test for ThreadInfo.getLockedMonitors()
* - a stack frame acquires no monitor
* - a stack frame acquires one or more monitors
* - a stack frame blocks on Object.wait
* and the monitor waiting is not locked.
* LockingThread is the class that creates threads
* and do the checking.
*
* @author Mandy Chung
*
* @build Barrier
* @build LockingThread
* @build ThreadDump
* @run main/othervm LockedMonitors
*/
import java.lang.management.*;
import java.util.*;
public class LockedMonitors {
public static void main(String[] argv) throws Exception {
ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
if (!mbean.isObjectMonitorUsageSupported()) {
System.out.println("Monitoring of object monitor usage is not supported");
return;
}
// Start the thread and print the thread dump
LockingThread.startLockingThreads();
ThreadDump.threadDump();
ThreadInfo[] tinfos;
long[] ids = LockingThread.getThreadIds();
// Dump all threads with locked monitors
tinfos = mbean.dumpAllThreads(true, false);
LockingThread.checkLockedMonitors(tinfos);
// Dump all threads with locked monitors and locked synchronizers
tinfos = mbean.dumpAllThreads(true, true);
LockingThread.checkLockedMonitors(tinfos);
// Test getThreadInfo with locked monitors
tinfos = mbean.getThreadInfo(ids, true, false);
if (tinfos.length != ids.length) {
throw new RuntimeException("Number of ThreadInfo objects = " +
tinfos.length + " not matched. Expected: " + ids.length);
}
LockingThread.checkLockedMonitors(tinfos);
// Test getThreadInfo with locked monitors and locked synchronizers
tinfos = mbean.getThreadInfo(ids, true, true);
if (tinfos.length != ids.length) {
throw new RuntimeException("Number of ThreadInfo objects = " +
tinfos.length + " not matched. Expected: " + ids.length);
}
LockingThread.checkLockedMonitors(tinfos);
System.out.println("Test passed");
}
}
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