/*

 * 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 5047639

 * @summary Check that the "java-level" APIs provide a consistent view of

 *          the thread list

 */

import java.lang.management.ManagementFactory;

import java.lang.management.ThreadMXBean;

import java.util.Map;

public class ThreadLists {

    public static void main(String args[]) {

        // get top-level thread group

        ThreadGroup top = Thread.currentThread().getThreadGroup();

        ThreadGroup parent;

        do {

            parent = top.getParent();

            if (parent != null) top = parent;

        } while (parent != null);

        // get the thread count

        int activeCount = top.activeCount();

        Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();

        ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();

        int threadCount = threadBean.getThreadCount();

        long[] threadIds = threadBean.getAllThreadIds();

        System.out.println("ThreadGroup: " + activeCount + " active thread(s)");

        System.out.println("Thread: " + stackTraces.size() + " stack trace(s) returned");

        System.out.println("ThreadMXBean: " + threadCount + " live threads(s)");

        System.out.println("ThreadMXBean: " + threadIds.length + " thread Id(s)");

        // check results are consistent

        boolean failed = false;

        if (activeCount != stackTraces.size()) failed = true;

        if (activeCount != threadCount) failed = true;

        if (activeCount != threadIds.length) failed = true;

        if (failed) {

            throw new RuntimeException("inconsistent results");

        }

    }

}