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test/runtime/InternalApi/ThreadCpuTimesDeadlock.java@710a3c8b516e (annotated)

test/runtime/InternalApi/ThreadCpuTimesDeadlock.java

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 5476

fa57c8104b76

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	/*
aoqi@0	26	* @test
aoqi@0	27	* @bug 7196045
aoqi@0	28	* @bug 8014294
aoqi@0	29	* @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
aoqi@0	30	* @run main/othervm -XX:+UsePerfData -Xmx32m ThreadCpuTimesDeadlock
aoqi@0	31	*/
aoqi@0	32
aoqi@0	33	import java.lang.management.ManagementFactory;
aoqi@0	34	import javax.management.JMException;
aoqi@0	35	import javax.management.MBeanServer;
aoqi@0	36	import javax.management.MalformedObjectNameException;
aoqi@0	37	import javax.management.ObjectName;
aoqi@0	38
aoqi@0	39	public class ThreadCpuTimesDeadlock {
aoqi@0	40
aoqi@0	41	public static byte[] dummy;
aoqi@0	42	public static long duration = 10 * 1000;
aoqi@0	43	private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
aoqi@0	44
aoqi@0	45	public static void main(String[] args) {
aoqi@0	46
aoqi@0	47	MBeanServer server = ManagementFactory.getPlatformMBeanServer();
aoqi@0	48	ObjectName objName= null;
aoqi@0	49	try {
aoqi@0	50	ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
aoqi@0	51	try {
aoqi@0	52	server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
aoqi@0	53	} catch (JMException e) {
aoqi@0	54	throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
aoqi@0	55	}
aoqi@0	56	objName= new ObjectName("sun.management:type=HotspotThreading");
aoqi@0	57
aoqi@0	58	} catch (MalformedObjectNameException e1) {
aoqi@0	59	throw new RuntimeException("Bad object name" + e1);
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	// Thread that allocs memory to generate GC's
aoqi@0	63	Thread allocThread = new Thread() {
aoqi@0	64	public void run() {
aoqi@0	65	while (true) {
aoqi@0	66	dummy = new byte[4096];
aoqi@0	67	}
aoqi@0	68	}
aoqi@0	69	};
aoqi@0	70
aoqi@0	71	allocThread.setDaemon(true);
aoqi@0	72	allocThread.start();
aoqi@0	73
aoqi@0	74	long endTime = System.currentTimeMillis() + duration;
aoqi@0	75	long i = 0;
aoqi@0	76	while (true) {
aoqi@0	77	try {
aoqi@0	78	server.getAttribute(objName, "InternalThreadCpuTimes");
aoqi@0	79	} catch (Exception ex) {
aoqi@0	80	System.err.println("Exception while getting attribute: " + ex);
aoqi@0	81	}
aoqi@0	82	i++;
aoqi@0	83	if (i % 10000 == 0) {
aoqi@0	84	System.out.println("Successful iterations: " + i);
aoqi@0	85	}
aoqi@0	86	if (System.currentTimeMillis() > endTime) {
aoqi@0	87	break;
aoqi@0	88	}
aoqi@0	89	}
aoqi@0	90	System.out.println("PASSED.");
aoqi@0	91	}
aoqi@0	92	}