• file
• revisions
• annotate
• diff
• comparison
• raw

test/runtime/7196045/Test7196045.java@6af8f3562069 (annotated)

test/runtime/7196045/Test7196045.java

Wed, 19 Sep 2012 15:24:32 +0100

author

kevinw

date

Wed, 19 Sep 2012 15:24:32 +0100

changeset 4090

6af8f3562069

child 4143

fab6fbf427d2

permissions

-rw-r--r--

7196045: Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
Reviewed-by: sspitsyn, dholmes

kevinw@4090	1	/*
kevinw@4090	2	* Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
kevinw@4090	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
kevinw@4090	4	*
kevinw@4090	5	* This code is free software; you can redistribute it and/or modify it
kevinw@4090	6	* under the terms of the GNU General Public License version 2 only, as
kevinw@4090	7	* published by the Free Software Foundation.
kevinw@4090	8	*
kevinw@4090	9	* This code is distributed in the hope that it will be useful, but WITHOUT
kevinw@4090	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
kevinw@4090	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
kevinw@4090	12	* version 2 for more details (a copy is included in the LICENSE file that
kevinw@4090	13	* accompanied this code).
kevinw@4090	14	*
kevinw@4090	15	* You should have received a copy of the GNU General Public License version
kevinw@4090	16	* 2 along with this work; if not, write to the Free Software Foundation,
kevinw@4090	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
kevinw@4090	18	*
kevinw@4090	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
kevinw@4090	20	* or visit www.oracle.com if you need additional information or have any
kevinw@4090	21	* questions.
kevinw@4090	22	*
kevinw@4090	23	*/
kevinw@4090	24
kevinw@4090	25	/*
kevinw@4090	26	* @test
kevinw@4090	27	* @bug 7196045
kevinw@4090	28	* @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
kevinw@4090	29	* @run main/othervm
kevinw@4090	30	*/
kevinw@4090	31
kevinw@4090	32	import java.lang.management.ManagementFactory;
kevinw@4090	33	import javax.management.JMException;
kevinw@4090	34	import javax.management.MBeanServer;
kevinw@4090	35	import javax.management.MalformedObjectNameException;
kevinw@4090	36	import javax.management.ObjectName;
kevinw@4090	37
kevinw@4090	38	public class Test7196045 {
kevinw@4090	39
kevinw@4090	40	public static long duration = 1000 * 60 * 2;
kevinw@4090	41	private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
kevinw@4090	42
kevinw@4090	43	public static void main(String[] args) {
kevinw@4090	44
kevinw@4090	45	MBeanServer server = ManagementFactory.getPlatformMBeanServer();
kevinw@4090	46	ObjectName objName= null;
kevinw@4090	47	try {
kevinw@4090	48	ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
kevinw@4090	49	try {
kevinw@4090	50	server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
kevinw@4090	51	} catch (JMException e) {
kevinw@4090	52	throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
kevinw@4090	53	}
kevinw@4090	54	objName= new ObjectName("sun.management:type=HotspotThreading");
kevinw@4090	55
kevinw@4090	56	} catch (MalformedObjectNameException e1) {
kevinw@4090	57	throw new RuntimeException("Bad object name" + e1);
kevinw@4090	58	}
kevinw@4090	59
kevinw@4090	60	long endTime = System.currentTimeMillis() + duration;
kevinw@4090	61	long i = 0;
kevinw@4090	62	while (true) {
kevinw@4090	63	try {
kevinw@4090	64	server.getAttribute(objName, "InternalThreadCpuTimes");
kevinw@4090	65	} catch (Exception ex) {
kevinw@4090	66	System.err.println("Exception while getting attribute: " + ex);
kevinw@4090	67	}
kevinw@4090	68	i++;
kevinw@4090	69	if (i % 10000 == 0) {
kevinw@4090	70	System.out.println("Successful iterations: " + i);
kevinw@4090	71	}
kevinw@4090	72	if (System.currentTimeMillis() > endTime) {
kevinw@4090	73	break;
kevinw@4090	74	}
kevinw@4090	75	}
kevinw@4090	76	System.out.println("PASSED.");
kevinw@4090	77	}
kevinw@4090	78	}