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 *

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

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

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 * 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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/*

 * @test

 * @bug 6399443

 * @run main/othervm AutoShutdown

 * @summary Check for auto-shutdown and gc of singleThreadExecutors

 * @author Martin Buchholz

 */

import java.io.*;

import java.util.*;

import java.util.concurrent.*;

import static java.util.concurrent.Executors.*;

import java.util.concurrent.Phaser;

public class AutoShutdown {

    private static void waitForFinalizersToRun() {

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

            tryWaitForFinalizersToRun();

    }

    private static void tryWaitForFinalizersToRun() {

        System.gc();

        final CountDownLatch fin = new CountDownLatch(1);

        new Object() { protected void finalize() { fin.countDown(); }};

        System.gc();

        try { fin.await(); }

        catch (InterruptedException ie) { throw new Error(ie); }

    }

    private static void realMain(String[] args) throws Throwable {

        final Phaser phaser = new Phaser(3);

        Runnable trivialRunnable = new Runnable() {

            public void run() {

                phaser.arriveAndAwaitAdvance();

            }

        };

        int count0 = Thread.activeCount();

        Executor e1 = newSingleThreadExecutor();

        Executor e2 = newSingleThreadExecutor(defaultThreadFactory());

        e1.execute(trivialRunnable);

        e2.execute(trivialRunnable);

        phaser.arriveAndAwaitAdvance();

        equal(Thread.activeCount(), count0 + 2);

        e1 = e2 = null;

        for (int i = 0; i < 10 && Thread.activeCount() > count0; i++)

            tryWaitForFinalizersToRun();

        equal(Thread.activeCount(), count0);

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}