/*

 * Copyright 2005 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 6316155

 * @summary Test concurrent offer vs. remove

 * @author Martin Buchholz

 */

import java.util.concurrent.*;

public class OfferRemoveLoops {

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

        testQueue(new LinkedBlockingQueue<String>(10));

        testQueue(new LinkedBlockingQueue<String>());

        testQueue(new LinkedBlockingDeque<String>(10));

        testQueue(new LinkedBlockingDeque<String>());

        testQueue(new ArrayBlockingQueue<String>(10));

        testQueue(new PriorityBlockingQueue<String>(10));

    }

    private abstract static class ControlledThread extends Thread {

        abstract protected void realRun();

        public void run() {

            try { realRun(); } catch (Throwable t) { unexpected(t); }

        }

    }

    private static void testQueue(final BlockingQueue<String> q) throws Throwable {

        System.out.println(q.getClass());

        final int count = 10000;

        Thread t1 = new ControlledThread() {

                protected void realRun() {

                    for (int i = 0, j = 0; i < count; i++)

                        while (! q.remove(String.valueOf(i)))

                            Thread.yield();}};

        Thread t2 = new ControlledThread() {

                protected void realRun() {

                    for (int i = 0, j = 0; i < count; i++)

                        while (! q.offer(String.valueOf(i)))

                            Thread.yield();}};

        t1.setDaemon(true); t2.setDaemon(true);

        t1.start(); t2.start();

        t1.join(10000); t2.join(10000);

        check(! t1.isAlive());

        check(! t2.isAlive());

    }

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

    static volatile int passed = 0, failed = 0;

    static void pass() { passed++; }

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

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

    static void check(boolean cond) { if (cond) pass(); else fail(); }

    static void equal(Object x, Object y) {

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

        else {System.out.println(x + " not equal to " + y); fail(); }}

    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 Exception("Some tests failed");

    }

}