1 /*

     2  * Copyright 2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 6316155

    27  * @summary Test concurrent offer vs. remove

    28  * @author Martin Buchholz

    29  */

    30 

    31 import java.util.concurrent.*;

    32 

    33 public class OfferRemoveLoops {

    34     private static void realMain(String[] args) throws Throwable {

    35         testQueue(new LinkedBlockingQueue<String>(10));

    36         testQueue(new LinkedBlockingQueue<String>());

    37         testQueue(new LinkedBlockingDeque<String>(10));

    38         testQueue(new LinkedBlockingDeque<String>());

    39         testQueue(new ArrayBlockingQueue<String>(10));

    40         testQueue(new PriorityBlockingQueue<String>(10));

    41     }

    42 

    43     private abstract static class ControlledThread extends Thread {

    44         abstract protected void realRun();

    45         public void run() {

    46             try { realRun(); } catch (Throwable t) { unexpected(t); }

    47         }

    48     }

    49 

    50     private static void testQueue(final BlockingQueue<String> q) throws Throwable {

    51         System.out.println(q.getClass());

    52         final int count = 10000;

    53         Thread t1 = new ControlledThread() {

    54                 protected void realRun() {

    55                     for (int i = 0, j = 0; i < count; i++)

    56                         while (! q.remove(String.valueOf(i)))

    57                             Thread.yield();}};

    58         Thread t2 = new ControlledThread() {

    59                 protected void realRun() {

    60                     for (int i = 0, j = 0; i < count; i++)

    61                         while (! q.offer(String.valueOf(i)))

    62                             Thread.yield();}};

    63         t1.setDaemon(true); t2.setDaemon(true);

    64         t1.start(); t2.start();

    65         t1.join(10000); t2.join(10000);

    66         check(! t1.isAlive());

    67         check(! t2.isAlive());

    68     }

    69 

    70     //--------------------- Infrastructure ---------------------------

    71     static volatile int passed = 0, failed = 0;

    72     static void pass() { passed++; }

    73     static void fail() { failed++; Thread.dumpStack(); }

    74     static void unexpected(Throwable t) { failed++; t.printStackTrace(); }

    75     static void check(boolean cond) { if (cond) pass(); else fail(); }

    76     static void equal(Object x, Object y) {

    77         if (x == null ? y == null : x.equals(y)) pass();

    78         else {System.out.println(x + " not equal to " + y); fail(); }}

    79 

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

    81         try { realMain(args); } catch (Throwable t) { unexpected(t); }

    82 

    83         System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

    84         if (failed > 0) throw new Exception("Some tests failed");

    85     }

    86 }