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test/runtime/InternalApi/ThreadCpuTimesDeadlock.java@fb9d124d9192 (annotated)

test/runtime/InternalApi/ThreadCpuTimesDeadlock.java

Wed, 21 May 2014 10:56:41 -0700

author

katleman

date

Wed, 21 May 2014 10:56:41 -0700

changeset 6672

fb9d124d9192

parent 5476

fa57c8104b76

child 6876

710a3c8b516e

permissions

-rw-r--r--

Added tag jdk8u20-b15 for changeset 8c785f9bde6f

kevinw@4090	1	/*
ctornqvi@5476	2	* Copyright (c) 2012, 2013, 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
ctornqvi@5476	28	* @bug 8014294
kevinw@4090	29	* @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
ctornqvi@5476	30	* @run main/othervm -XX:+UsePerfData -Xmx32m ThreadCpuTimesDeadlock
kevinw@4090	31	*/
kevinw@4090	32
kevinw@4090	33	import java.lang.management.ManagementFactory;
kevinw@4090	34	import javax.management.JMException;
kevinw@4090	35	import javax.management.MBeanServer;
kevinw@4090	36	import javax.management.MalformedObjectNameException;
kevinw@4090	37	import javax.management.ObjectName;
kevinw@4090	38
ctornqvi@5476	39	public class ThreadCpuTimesDeadlock {
kevinw@4090	40
ctornqvi@5476	41	public static byte[] dummy;
ctornqvi@5476	42	public static long duration = 10 * 1000;
kevinw@4090	43	private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
kevinw@4090	44
kevinw@4090	45	public static void main(String[] args) {
kevinw@4090	46
kevinw@4090	47	MBeanServer server = ManagementFactory.getPlatformMBeanServer();
kevinw@4090	48	ObjectName objName= null;
kevinw@4090	49	try {
kevinw@4090	50	ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
kevinw@4090	51	try {
kevinw@4090	52	server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
kevinw@4090	53	} catch (JMException e) {
kevinw@4090	54	throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
kevinw@4090	55	}
kevinw@4090	56	objName= new ObjectName("sun.management:type=HotspotThreading");
kevinw@4090	57
kevinw@4090	58	} catch (MalformedObjectNameException e1) {
kevinw@4090	59	throw new RuntimeException("Bad object name" + e1);
kevinw@4090	60	}
kevinw@4090	61
ctornqvi@5476	62	// Thread that allocs memory to generate GC's
ctornqvi@5476	63	Thread allocThread = new Thread() {
ctornqvi@5476	64	public void run() {
ctornqvi@5476	65	while (true) {
ctornqvi@5476	66	dummy = new byte[4096];
ctornqvi@5476	67	}
ctornqvi@5476	68	}
ctornqvi@5476	69	};
ctornqvi@5476	70
ctornqvi@5476	71	allocThread.setDaemon(true);
ctornqvi@5476	72	allocThread.start();
ctornqvi@5476	73
kevinw@4090	74	long endTime = System.currentTimeMillis() + duration;
kevinw@4090	75	long i = 0;
kevinw@4090	76	while (true) {
kevinw@4090	77	try {
kevinw@4090	78	server.getAttribute(objName, "InternalThreadCpuTimes");
kevinw@4090	79	} catch (Exception ex) {
kevinw@4090	80	System.err.println("Exception while getting attribute: " + ex);
kevinw@4090	81	}
kevinw@4090	82	i++;
kevinw@4090	83	if (i % 10000 == 0) {
kevinw@4090	84	System.out.println("Successful iterations: " + i);
kevinw@4090	85	}
kevinw@4090	86	if (System.currentTimeMillis() > endTime) {
kevinw@4090	87	break;
kevinw@4090	88	}
kevinw@4090	89	}
kevinw@4090	90	System.out.println("PASSED.");
kevinw@4090	91	}
kevinw@4090	92	}