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/*
* Copyright (c) 2018, 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.
*/
import java.lang.management.*;
/*
* @test
* @bug 8205878 8206954
* @requires os.family != "windows" & os.family != "solaris"
* @summary Basic test of Thread and ThreadMXBean queries on a natively
* attached thread that has failed to detach before terminating.
* @comment The native code only supports POSIX so no windows testing; also
* we have to skip solaris as a terminating thread that fails to
* detach will hit an infinite loop due to TLS destructor issues - see
* comments in JDK-8156708
* @run main/othervm/native TestTerminatedThread
*/
public class TestTerminatedThread {
static native Thread createTerminatedThread();
static {
System.loadLibrary("terminatedThread");
}
private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
public static void main(String[] args) throws Throwable {
Thread t = createTerminatedThread();
if (!t.isAlive())
throw new Error("Thread is only supposed to terminate at native layer!");
// Now invoke the various functions on this thread to
// make sure the VM handles it okay. The focus is on
// functions with an underlying native OS implementation.
// Generally as long as we don't crash or throw unexpected
// exceptions then the test passes. In some cases we know exactly
// what a function should return and so can check that.
System.out.println("Working with thread: " + t +
", in state: " + t.getState());
System.out.println("Calling suspend ...");
t.suspend();
System.out.println("Calling resume ...");
t.resume();
System.out.println("Calling getStackTrace ...");
StackTraceElement[] stack = t.getStackTrace();
System.out.println(java.util.Arrays.toString(stack));
if (stack.length != 0)
throw new Error("Terminated thread should have empty java stack trace");
System.out.println("Calling setName(\"NewName\") ...");
t.setName("NewName");
System.out.println("Calling interrupt ...");
t.interrupt();
System.out.println("Calling stop ...");
t.stop();
// Now the ThreadMXBean functions
if (mbean.isThreadCpuTimeSupported() &&
mbean.isThreadCpuTimeEnabled() ) {
System.out.println("Calling getThreadCpuTime ...");
long t1 = mbean.getThreadCpuTime(t.getId());
if (t1 != -1) {
// At least on PPC, we know threads can still be around a short
// instant. In some stress scenarios we seem to grab times of
// new threads started with the same thread id. In these cases
// we get here.
System.out.println("Unexpected: thread still reports CPU time: " + t1);
} else {
System.out.println("Okay: getThreadCpuTime() reported -1 as expected");
}
} else {
System.out.println("Skipping Thread CPU time test as it's not supported");
}
System.out.println("Calling getThreadUserTime ...");
long t1 = mbean.getThreadUserTime(t.getId());
if (t1 != -1) {
// At least on PPC, we know threads can still be around a short
// instant. In some stress scenarios we seem to grab times of
// new threads started with the same thread id. In these cases
// we get here.
System.out.println("Unexpected: thread still reports User time: " + t1);
} else {
System.out.println("Okay: getThreadUserTime() reported -1 as expected");
}
System.out.println("Calling getThreadInfo ...");
ThreadInfo info = mbean.getThreadInfo(t.getId());
System.out.println(info);
System.out.println("Calling getThreadInfo with stack ...");
info = mbean.getThreadInfo(t.getId(), Integer.MAX_VALUE);
System.out.println(info);
}
}
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