aoqi@0: /*
aoqi@0:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * @test
aoqi@0:  * @bug 7196045
aoqi@0:  * @bug 8014294
aoqi@0:  * @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
aoqi@0:  * @run main/othervm -XX:+UsePerfData -Xmx32m ThreadCpuTimesDeadlock
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.lang.management.ManagementFactory;
aoqi@0: import javax.management.JMException;
aoqi@0: import javax.management.MBeanServer;
aoqi@0: import javax.management.MalformedObjectNameException;
aoqi@0: import javax.management.ObjectName;
aoqi@0: 
aoqi@0: public class ThreadCpuTimesDeadlock {
aoqi@0: 
aoqi@0:     public static byte[] dummy;
aoqi@0:     public static long duration = 10 * 1000;
aoqi@0:     private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
aoqi@0: 
aoqi@0:     public static void main(String[] args) {
aoqi@0: 
aoqi@0:         MBeanServer server = ManagementFactory.getPlatformMBeanServer();
aoqi@0:         ObjectName objName= null;
aoqi@0:         try {
aoqi@0:             ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
aoqi@0:             try {
aoqi@0:                 server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
aoqi@0:             } catch (JMException e) {
aoqi@0:                 throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
aoqi@0:             }
aoqi@0:             objName= new ObjectName("sun.management:type=HotspotThreading");
aoqi@0: 
aoqi@0:         } catch (MalformedObjectNameException e1) {
aoqi@0:             throw new RuntimeException("Bad object name" + e1);
aoqi@0:         }
aoqi@0: 
aoqi@0:         // Thread that allocs memory to generate GC's
aoqi@0:         Thread allocThread = new Thread() {
aoqi@0:           public void run() {
aoqi@0:             while (true) {
aoqi@0:               dummy = new byte[4096];
aoqi@0:             }
aoqi@0:           }
aoqi@0:         };
aoqi@0: 
aoqi@0:         allocThread.setDaemon(true);
aoqi@0:         allocThread.start();
aoqi@0: 
aoqi@0:         long endTime = System.currentTimeMillis() + duration;
aoqi@0:         long i = 0;
aoqi@0:         while (true) {
aoqi@0:             try {
aoqi@0:                 server.getAttribute(objName, "InternalThreadCpuTimes");
aoqi@0:             } catch (Exception ex) {
aoqi@0:                 System.err.println("Exception while getting attribute: " + ex);
aoqi@0:             }
aoqi@0:             i++;
aoqi@0:             if (i % 10000 == 0) {
aoqi@0:                 System.out.println("Successful iterations: " + i);
aoqi@0:             }
aoqi@0:             if (System.currentTimeMillis() > endTime) {
aoqi@0:                 break;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         System.out.println("PASSED.");
aoqi@0:     }
aoqi@0: }