/*

 * Copyright (c) 1999, 2011, 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

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 * 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.");

    }

}