/*

 * Copyright (c) 2004, 2017, 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.

 *

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 * questions.

 */

/* @test

 * @bug 5004077

 * @summary Check blocking of select and close

 */

import java.nio.channels.*;

import java.io.IOException;

import java.util.concurrent.CountDownLatch;

public class SelectAndClose {

    static Selector selector;

    static volatile boolean awakened = false;

    static volatile boolean closed = false;

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

        selector = Selector.open();

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

        final CountDownLatch selectLatch = new CountDownLatch(1);

        new Thread(new Runnable() {

                public void run() {

                    try {

                        selectLatch.countDown();

                        selector.select();

                        awakened = true;

                    } catch (IOException e) {

                        System.err.println(e);

                    }

                }

            }).start();

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

        selectLatch.await();

        Thread.sleep(2000);

        // Try to close. This should wakeup select.

        Thread closeThread = new Thread(new Runnable() {

                public void run() {

                    try {

                        selector.close();

                        closed = true;

                    } catch (IOException e) {

                        System.err.println(e);

                    }

                }

            });

        closeThread.start();

        // Wait for select() to be awakened, which should be done by close.

        closeThread.join();

        if (!awakened)

            selector.wakeup();

        // Correct result is true and true

        if (!awakened)

            throw new RuntimeException("Select did not wake up");

        if (!closed)

            throw new RuntimeException("Selector did not close");

    }

}