/*
* Copyright (c) 1999, 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.
*/
/**
* @test
* @bug 4176355
* @summary Stopping a ThreadGroup that contains the current thread has
* unpredictable results.
*/
public class Stop implements Runnable {
private static boolean groupStopped = false ;
private static final Object lock = new Object();
private static final ThreadGroup group = new ThreadGroup("");
private static final Thread first = new Thread(group, new Stop());
private static final Thread second = new Thread(group, new Stop());
public void run() {
while (true) {
// Give the other thread a chance to start
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
// When the first thread runs, it will stop the group.
if (Thread.currentThread() == first) {
synchronized (lock) {
try {
group.stop();
} finally {
// Signal the main thread it is time to check
// that the stopped thread group was successful
groupStopped = true;
lock.notifyAll();
}
}
}
}
}
public static void main(String[] args) throws Exception {
// Launch two threads as part of the same thread group
first.start();
second.start();
// Wait for the thread group stop to be issued
synchronized(lock){
while (!groupStopped) {
lock.wait();
// Give the other thread a chance to stop
Thread.sleep(1000);
}
}
// Check that the second thread is terminated when the
// first thread terminates the thread group.
boolean failed = second.isAlive();
// Clean up any threads that may have not been terminated
first.stop();
second.stop();
if (failed)
throw new RuntimeException("Failure.");
}
}