/*

 * Copyright (c) 2004, 2018, Oracle and/or its affiliates. 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 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 4729342

 * @library /test/lib

 * @build jdk.test.lib.Utils

 * @run main SelectAndCancel

 * @summary Check for CancelledKeyException when key cancelled during select

 */

import java.net.InetAddress;

import java.net.InetSocketAddress;

import java.nio.channels.SelectionKey;

import java.nio.channels.Selector;

import java.nio.channels.ServerSocketChannel;

import java.util.concurrent.CountDownLatch;

public class SelectAndCancel {

    static volatile SelectionKey sk;

    static volatile Throwable ex;

    /*

     * CancelledKeyException is the failure symptom of 4729342

     * NOTE: The failure is timing dependent and is not always

     * seen immediately when the bug is present.

     */

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

        final Selector selector = Selector.open();

        final ServerSocketChannel ssc = ServerSocketChannel.open().bind(

                new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));

        final InetSocketAddress isa = (InetSocketAddress)ssc.getLocalAddress();

        final CountDownLatch signal = new CountDownLatch(1);

        // Create and start a selector in a separate thread.

        Thread t = new Thread(new Runnable() {

                public void run() {

                    try {

                        ssc.configureBlocking(false);

                        sk = ssc.register(selector, SelectionKey.OP_ACCEPT);

                        signal.countDown();

                        selector.select();

                    } catch (Throwable e) {

                        ex = e;

                    }

                }

            });

        t.start();

        signal.await();

        // Wait for above thread to get to select() before we call cancel.

        Thread.sleep((long)(300 * jdk.test.lib.Utils.TIMEOUT_FACTOR));

        // CancelledKeyException should not be thrown.

        ssc.close();

        sk.cancel();

        selector.close();

        t.join();

        if (ex != null) {

            throw ex;

        }

    }

}