1 /*

     2  * Copyright 1999 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  * @summary Basic functional test of ThreadLocal

    27  * @author Josh Bloch

    28  */

    29 

    30 public class Basic {

    31     static ThreadLocal n = new ThreadLocal() {

    32         int i = 0;

    33         protected synchronized Object initialValue() {

    34             return new Integer(i++);

    35         }

    36     };

    37 

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

    39         int threadCount = 100;

    40         Thread th[] = new Thread[threadCount];

    41         final int x[] = new int[threadCount];

    42 

    43         // Start the threads

    44         for(int i=0; i<threadCount; i++) {

    45             th[i] = new Thread() {

    46                 public void run() {

    47                     int threadId = ((Integer)(n.get())).intValue();

    48                     for (int j=0; j<threadId; j++) {

    49                         x[threadId]++;

    50                         Thread.currentThread().yield();

    51                     }

    52                 }

    53             };

    54             th[i].start();

    55         }

    56 

    57         // Wait for the threads to finish

    58         for(int i=0; i<threadCount; i++)

    59             th[i].join();

    60 

    61         // Check results

    62         for(int i=0; i<threadCount; i++)

    63             if (x[i] != i)

    64                 throw(new Exception("x[" + i + "] =" + x[i]));

    65     }

    66 }