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

 *

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 * 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.

 *

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import java.lang.management.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.concurrent.atomic.*;

/*

 * @test

 * @bug     6588467

 * @summary Basic test of ThreadInfo.isDaemon

 * @author  Jeremy Manson

 */

public class ThreadDaemonTest {

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

        final int NUM_THREADS = 20;

        final String THREAD_PREFIX = "ThreadDaemonTest-";

        final CountDownLatch started = new CountDownLatch(NUM_THREADS);

        final CountDownLatch finished = new CountDownLatch(1);

        final AtomicReference<Exception> fail = new AtomicReference<>(null);

        Thread[] allThreads = new Thread[NUM_THREADS];

        ThreadMXBean mbean = ManagementFactory.getThreadMXBean();

        Random rand = new Random();

        for (int i = 0; i < NUM_THREADS; i++) {

            allThreads[i] = new Thread(new Runnable() {

                    public void run() {

                        try {

                            started.countDown();

                            finished.await();

                        } catch (InterruptedException e) {

                            fail.set(new Exception(

                                "Unexpected InterruptedException"));

                        }

                    }

                }, THREAD_PREFIX + i);

            allThreads[i].setDaemon(rand.nextBoolean());

            allThreads[i].start();

        }

        started.await();

        try {

            ThreadInfo[] allThreadInfos = mbean.dumpAllThreads(false, false);

            int count = 0;

            for (int i = 0; i < allThreadInfos.length; i++) {

                String threadName = allThreadInfos[i].getThreadName();

                if (threadName.startsWith(THREAD_PREFIX)) {

                    count++;

                    String[] nameAndNumber = threadName.split("-");

                    int threadNum = Integer.parseInt(nameAndNumber[1]);

                    if (allThreads[threadNum].isDaemon() !=

                        allThreadInfos[i].isDaemon()) {

                        throw new RuntimeException(

                            allThreads[threadNum] + " is not like " +

                            allThreadInfos[i] + ". TEST FAILED.");

                    }

                }

            }

            if (count != NUM_THREADS) {

                throw new RuntimeException("Wrong number of threads examined");

            }

        }

        finally { finished.countDown(); }

        for (int i = 0; i < NUM_THREADS; i++) {

            allThreads[i].join();

        }

        if (fail.get() != null) {

            throw fail.get();

        }

    }

}