J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 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 4992438 |
| 27 | * @compile -source 1.5 Fairness.java |
| 28 | * @run main Fairness |
| 29 | * @summary Checks that fairness setting is respected. |
| 30 | */ |
| 31 | |
| 32 | import java.util.concurrent.*; |
| 33 | |
| 34 | public class Fairness { |
| 35 | private static void testFairness(boolean fair, |
| 36 | final BlockingQueue<Integer> q) |
| 37 | throws Exception |
| 38 | { |
| 39 | for (int i = 0; i < 3; i++) { |
| 40 | final Integer I = new Integer(i); |
| 41 | new Thread() { public void run() { |
| 42 | try { q.put(I); } catch (Exception e) {} |
| 43 | }}.start(); |
| 44 | Thread.currentThread().sleep(100); |
| 45 | } |
| 46 | for (int i = 0; i < 3; i++) { |
| 47 | int j = q.take().intValue(); |
| 48 | System.err.printf("%d%n",j); |
| 49 | // Non-fair queues are lifo in our implementation |
| 50 | if (fair ? j != i : j != 2-i) |
| 51 | throw new Exception("No fair!"); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | public static void main(String[] args) throws Exception { |
| 56 | testFairness(false, new SynchronousQueue<Integer>()); |
| 57 | testFairness(false, new SynchronousQueue<Integer>(false)); |
| 58 | testFairness(true, new SynchronousQueue<Integer>(true)); |
| 59 | } |
| 60 | } |