0N/A/*
2362N/A * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
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0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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0N/A */
0N/A
0N/A/*
0N/A * @test
0N/A * @bug 6337571
0N/A * @summary Test if findDeadlockedThreads works for an ownable synchronizer
0N/A * in shared mode which has no owner when a thread is parked.
0N/A * @author Mandy Chung
0N/A *
0N/A * @run main SharedSynchronizer
0N/A */
0N/A
0N/A
0N/Aimport java.util.concurrent.*;
0N/Aimport java.lang.management.ManagementFactory;
0N/Aimport java.lang.management.ThreadMXBean;
0N/A
0N/Apublic class SharedSynchronizer {
0N/A public static void main(String[] args) throws Exception {
0N/A MyThread t = new MyThread();
0N/A t.setDaemon(true);
0N/A t.start();
0N/A
0N/A ThreadMXBean tmbean = ManagementFactory.getThreadMXBean();
0N/A if (!tmbean.isSynchronizerUsageSupported()) {
0N/A System.out.println("Monitoring of synchronizer usage not supported")
0N/A;
0N/A return;
0N/A }
0N/A
0N/A long[] result = tmbean.findDeadlockedThreads();
0N/A if (result != null) {
0N/A throw new RuntimeException("TEST FAILED: result should be null");
0N/A }
0N/A }
0N/A
0N/A static class MyThread extends Thread {
0N/A public void run() {
0N/A FutureTask f = new FutureTask(
0N/A new Callable() {
0N/A public Object call() {
0N/A throw new RuntimeException("should never reach here");
0N/A }
0N/A }
0N/A );
0N/A
0N/A // A FutureTask uses the AbstractOwnableSynchronizer in a shared
0N/A // mode (not exclusive mode). When the thread calls f.get(),
0N/A // it will put to park on the ownable synchronizer that
0N/A // is not owned by any thread.
0N/A try {
0N/A f.get();
0N/A } catch (Exception e) {
0N/A RuntimeException re = new RuntimeException(e.getMessage());
0N/A re.initCause(e);
0N/A throw re;
0N/A }
0N/A }
0N/A }
0N/A}