1 /*
   2  * Copyright (c) 1999, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * 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 import java.util.concurrent.CountDownLatch;
  32 
  33 public class Stop {
  34 
  35     public static void main(String[] args) throws Exception {
  36         final CountDownLatch ready = new CountDownLatch(1);
  37         final ThreadGroup group = new ThreadGroup("");
  38 
  39         final Thread second = new Thread(group, () -> {
  40             ready.countDown();
  41             while (true) {
  42                 try {
  43                     Thread.sleep(60000);
  44                 } catch (InterruptedException shouldNotHappen) {
  45                 }
  46             }
  47         });
  48 
  49         final Thread first = new Thread(group, () -> {
  50             // Wait until "second" is started
  51             try {
  52                 ready.await();
  53             } catch (InterruptedException shouldNotHappen) {
  54             }
  55             // Now stop the group
  56             group.stop();
  57         });
  58 
  59         // Launch two threads as part of the same thread group
  60         first.start();
  61         second.start();
  62 
  63         // Check that the second thread is terminated when the
  64         // first thread terminates the thread group.
  65         second.join();
  66         // Test passed - if never get here the test times out and fails.
  67     }
  68 }