/*

 * Copyright (c) 2007, 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.

 *

 * 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 6524172

 * @summary Invoking wakeup on closed Selector can throw NPE if close resets interrupt status

 */

import java.io.IOException;

import java.nio.channels.ClosedSelectorException;

import java.nio.channels.Selector;

public class WakeupAfterClose {

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

        final Selector sel = Selector.open();

        Runnable r = new Runnable() {

            public void run() {

                try {

                    sel.select();

                } catch (IOException x) {

                    x.printStackTrace();

                } catch (ClosedSelectorException y) {

                    System.err.println

                        ("Caught expected ClosedSelectorException");

                }

            }

        };

        // start thread to block in Selector

        Thread t = new Thread(r);

        t.start();

        // give thread time to start

        Thread.sleep(1000);

        // interrupt, close, and wakeup is the magic sequence to provoke the NPE

        t.interrupt();

        sel.close();

        sel.wakeup();

    }

}