1 /*

     2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /* @test

    25  * @bug 4940372

    26  * @summary Ensure that the wakeup state is cleared by selectNow()

    27  */

    28 

    29 import java.nio.channels.*;

    30 

    31 public class WakeupNow {

    32 

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

    34         test1();

    35         test2();

    36     }

    37 

    38     // Test if selectNow clears wakeup with the wakeup fd and

    39     // another fd in the selector.

    40     // This fails before the fix on Linux

    41     private static void test1() throws Exception {

    42         Selector sel = Selector.open();

    43         Pipe p = Pipe.open();

    44         p.source().configureBlocking(false);

    45         p.source().register(sel, SelectionKey.OP_READ);

    46         sel.wakeup();

    47         // ensure wakeup is consumed by selectNow

    48         Thread.sleep(2000);

    49         sel.selectNow();

    50         long startTime = System.currentTimeMillis();

    51         int n = sel.select(2000);

    52         long endTime = System.currentTimeMillis();

    53         p.source().close();

    54         p.sink().close();

    55         sel.close();

    56         if (endTime - startTime < 1000)

    57             throw new RuntimeException("test failed");

    58     }

    59 

    60     // Test if selectNow clears wakeup with only the wakeup fd

    61     // in the selector.

    62     // This fails before the fix on Solaris

    63     private static void test2() throws Exception {

    64         Selector sel = Selector.open();

    65         Pipe p = Pipe.open();

    66         p.source().configureBlocking(false);

    67         sel.wakeup();

    68         // ensure wakeup is consumed by selectNow

    69         Thread.sleep(2000);

    70         sel.selectNow();

    71         long startTime = System.currentTimeMillis();

    72         int n = sel.select(2000);

    73         long endTime = System.currentTimeMillis();

    74         sel.close();

    75         if (endTime - startTime < 1000)

    76             throw new RuntimeException("test failed");

    77     }

    78 

    79 }