/*

 * Copyright 2006 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 6436220

 * @summary SelectionKey.attach should atomically set and return the attachment

 */

import java.nio.channels.*;

import java.util.concurrent.atomic.*;

public class AtomicAttachTest {

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

        Selector selector = Selector.open();

        Pipe pipe = Pipe.open();

        SelectableChannel channel = pipe.sink().configureBlocking(false);

        final SelectionKey key = channel.register(selector, 0);

        key.attach(new AtomicBoolean());

        final AtomicInteger errorCount = new AtomicInteger();

        Thread t = new Thread() {

            public void run() {

                AtomicBoolean att = new AtomicBoolean();

                for (int i=0; i<(10*1000*1000); i++) {

                    att = (AtomicBoolean)key.attach(att);

                    // We should have exclusive ownership of att.

                    if (!att.compareAndSet(false, true) ||

                        !att.compareAndSet(true, false))

                    {

                        errorCount.incrementAndGet();

                    }

                }

            }

            {

                start();

                run();

            }

        };

        t.join();

        int count = errorCount.get();

        if (count > 0) {

            throw new RuntimeException("Error count:" + count);

        }

    }

}