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 }