/*

 * 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 Suspending a ThreadGroup that contains the current thread has

 *          unpredictable results.

 */

public class Suspend implements Runnable {

    private static Thread first=null;

    private static Thread second=null;

    private static ThreadGroup group = new ThreadGroup("");

    private static int count = 0;

    Suspend() {

        Thread thread = new Thread(group, this);

        if (first == null)

            first = thread;

        else

            second = thread;

        thread.start();

    }

    public void run() {

        while (true) {

            try {

                Thread.sleep(1000); // Give other thread a chance to start

                if (Thread.currentThread() == first)

                    group.suspend();

                else

                    count++;

            } catch(InterruptedException e){

            }

        }

    }

    public static void main(String[] args) throws Exception {

        for (int i=0; i<2; i++)

            new Suspend();

        Thread.sleep(3000);

        boolean failed = (count > 1);

        first.stop(); second.stop();

        if (failed)

            throw new RuntimeException("Failure.");

    }

}