1 /*

     2  * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /**

    25  * @test

    26  * @bug 4176355

    27  * @summary Stopping a ThreadGroup that contains the current thread has

    28  *          unpredictable results.

    29  */

    30 

    31 public class Stop implements Runnable {

    32     private static Thread first=null;

    33     private static Thread second=null;

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

    35 

    36     Stop() {

    37         Thread thread = new Thread(group, this);

    38         if (first == null)

    39             first = thread;

    40         else

    41             second = thread;

    42 

    43         thread.start();

    44     }

    45 

    46     public void run() {

    47         while (true) {

    48             try {

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

    50                 if (Thread.currentThread() == first)

    51                     group.stop();

    52             } catch(InterruptedException e){

    53             }

    54         }

    55     }

    56 

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

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

    59             new Stop();

    60         Thread.sleep(3000);

    61         boolean failed = second.isAlive();

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

    63         if (failed)

    64             throw new RuntimeException("Failure.");

    65     }

    66 }