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/*
* Copyright (c) 2022, 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
/*
* @bug 8320515
* @summary This test checks that ObjectMonitors with dead objects don't
* cause asserts, crashes, or failures when various sub-systems
* in the JVM find them.
* @library /testlibrary /test/lib
* @modules jdk.management
*/
/*
* @requires os.family != "windows" & os.family != "aix"
* @test id=DetachThread
* @run main/othervm/native MonitorWithDeadObjectTest 0
*/
/*
* @requires os.family != "windows" & os.family != "aix"
* @test id=DumpThreadsBeforeDetach
* @run main/othervm/native MonitorWithDeadObjectTest 1
*/
/*
* @requires os.family != "windows" & os.family != "aix"
* @test id=DumpThreadsAfterDetach
* @run main/othervm/native MonitorWithDeadObjectTest 2
*/
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
public class MonitorWithDeadObjectTest {
public static native void createMonitorWithDeadObject();
public static native void createMonitorWithDeadObjectDumpThreadsBeforeDetach();
static {
System.loadLibrary("MonitorWithDeadObjectTest");
}
private static void dumpThreadsWithLockedMonitors() {
ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
threadBean.dumpAllThreads(true, false);
}
private static void testDetachThread() {
// Create an ObjectMonitor with a dead object from an attached thread.
// This used to provoke an assert in DetachCurrentThread.
createMonitorWithDeadObject();
}
private static void testDumpThreadsBeforeDetach() {
// Create an ObjectMonitor with a dead object from an attached thread
// and perform a thread dump before detaching the thread.
createMonitorWithDeadObjectDumpThreadsBeforeDetach();
}
private static void testDumpThreadsAfterDetach() {
createMonitorWithDeadObject();
// The thread dumping code used to not tolerate monitors with dead
// objects and the detach code used to not unlock these monitors, so
// test that we don't end up with a bug where these monitors are not
// unlocked and then passed to the thread dumping code.
dumpThreadsWithLockedMonitors();
}
public static void main(String[] args) throws Exception {
int test = Integer.parseInt(args[0]);
switch (test) {
case 0: testDetachThread(); break;
case 1: testDumpThreadsBeforeDetach(); break;
case 2: testDumpThreadsAfterDetach(); break;
default: throw new RuntimeException("Unknown test");
};
}
}
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