/*

 * Copyright 2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

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

 * have any questions.

 */

/*

 * @test

 * @bug 6379235

 * @run main/othervm -server -Xmx32m -Xms32m -Xss256m StartOOMTest

 * @summary ThreadGroup accounting mistake possible with failure of Thread.start()

 */

import java.util.*;

public class StartOOMTest

{

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

        Runnable r = new SleepRunnable();

        ThreadGroup tg = new ThreadGroup("buggy");

        List<Thread> threads = new ArrayList<Thread>();

        Thread failedThread;

        int i = 0;

        for (i = 0; ; i++) {

            Thread t = new Thread(tg, r);

            try {

                t.start();

                threads.add(t);

            } catch (Throwable x) {

                failedThread = t;

                System.out.println(x);

                System.out.println(i);

                break;

            }

        }

        int j = 0;

        for (Thread t : threads)

            t.interrupt();

        while (tg.activeCount() > i/2)

            Thread.yield();

        failedThread.start();

        failedThread.interrupt();

        for (Thread t : threads)

            t.join();

        failedThread.join();

        try {

            Thread.sleep(1000);

        } catch (Throwable ignore) {

        }

        int activeCount = tg.activeCount();

        System.out.println("activeCount = " + activeCount);

        if (activeCount > 0) {

            throw new RuntimeException("Failed: there  should be no active Threads in the group");

        }

    }

    static class SleepRunnable implements Runnable

    {

        public void run() {

            try {

                Thread.sleep(60*1000);

            } catch (Throwable t) {

            }

        }

    }

}