J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007 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 6434084 |
| 27 | * @summary Exercise ThreadLocal javadoc "demo" class ThreadId |
| 28 | * @author Pete Soper |
| 29 | */ |
| 30 | |
| 31 | public final class TestThreadId extends Thread { |
| 32 | |
| 33 | // number of times to create threads and gather their ids |
| 34 | private static final int ITERATIONCOUNT = 50; |
| 35 | |
| 36 | // Threads constructed per iteration. ITERATIONCOUNT=50 and |
| 37 | // THREADCOUNT=50 takes about one second on a sun Blade 1000 (2x750mhz) |
| 38 | private static final int THREADCOUNT = 50; |
| 39 | |
| 40 | // The thread local storage object for holding per-thread ids |
| 41 | private static ThreadId id = new ThreadId(); |
| 42 | |
| 43 | // Holds the per-thread so main method thread can collect it. JMM |
| 44 | // guarantees this is valid after this thread joins main method thread. |
| 45 | private int value; |
| 46 | |
| 47 | private synchronized int getIdValue() { |
| 48 | return value; |
| 49 | } |
| 50 | |
| 51 | // Each child thread just publishes its id value for validation |
| 52 | public void run() { |
| 53 | value = id.get(); |
| 54 | } |
| 55 | |
| 56 | public static void main(String args[]) throws Throwable { |
| 57 | |
| 58 | // holds true corresponding to a used id value |
| 59 | boolean check[] = new boolean[THREADCOUNT*ITERATIONCOUNT]; |
| 60 | |
| 61 | // the test threads |
| 62 | TestThreadId u[] = new TestThreadId[THREADCOUNT]; |
| 63 | |
| 64 | for (int i = 0; i < ITERATIONCOUNT; i++) { |
| 65 | // Create and start the threads |
| 66 | for (int t=0;t<THREADCOUNT;t++) { |
| 67 | u[t] = new TestThreadId(); |
| 68 | u[t].start(); |
| 69 | } |
| 70 | // Join with each thread and get/check its id |
| 71 | for (int t=0;t<THREADCOUNT;t++) { |
| 72 | try { |
| 73 | u[t].join(); |
| 74 | } catch (InterruptedException e) { |
| 75 | throw new RuntimeException( |
| 76 | "TestThreadId: Failed with unexpected exception" + e); |
| 77 | } |
| 78 | try { |
| 79 | if (check[u[t].getIdValue()]) { |
| 80 | throw new RuntimeException( |
| 81 | "TestThreadId: Failed with duplicated id: " + |
| 82 | u[t].getIdValue()); |
| 83 | } else { |
| 84 | check[u[t].getIdValue()] = true; |
| 85 | } |
| 86 | } catch (Exception e) { |
| 87 | throw new RuntimeException( |
| 88 | "TestThreadId: Failed with unexpected id value" + e); |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | } // main |
| 93 | } // TestThreadId |