test/java/nio/channels/Selector/WakeupEmpty.java

/*
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 * 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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 */

/* @test
 * @bug 4531740
 * @summary Checks that wakeup works for an empty Selector
 * @author kladko
 */

import java.nio.*;
import java.nio.channels.*;

public class WakeupEmpty {

    private final static int SLEEP_TIME = 100;

    public static void main(String[] argv) throws Exception {
        final Selector sel = Selector.open();
        Thread thread = new Thread() {
            public void run() {
                try {
                    sleep(SLEEP_TIME);
                } catch (InterruptedException e) {
                   //ignore
                }
                sel.wakeup();
            }
        };
        thread.start();
        if (sel.select() != 0)
             throw new Exception("Zero expected");
    }
}