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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 #include <pthread.h>
     29 #include <stdio.h>
     30 #include <stdlib.h>
     31 #include <time.h>
     32 
     33 #define  N_THREADS  100
     34 
     35 static pthread_once_t   once = PTHREAD_ONCE_INIT;
     36 
     37 static int      global_count = 0;
     38 
     39 static void
     40 once_function( void )
     41 {
     42     struct timespec ts;
     43 
     44     global_count += 1;
     45 
     46     ts.tv_sec = 2;
     47     ts.tv_nsec = 0;
     48     nanosleep (&ts, NULL);
     49 }
     50 
     51 static void*
     52 thread_function(void*  arg)
     53 {
     54     pthread_once( &once, once_function );
     55 
     56     if (global_count != 1) {
     57         printf ("thread %ld: global == %d\n", (long int) arg, global_count);
     58         exit (1);
     59     }
     60     return NULL;
     61 }
     62 
     63 int  main( void )
     64 {
     65     pthread_t   threads[N_THREADS];
     66     int         nn;
     67 
     68     for (nn = 0; nn < N_THREADS; nn++) {
     69         if (pthread_create( &threads[nn], NULL, thread_function, (void*)(long int)nn) < 0) {
     70             printf("creation of thread %d failed\n", nn);
     71             return 1;
     72         }
     73     }
     74 
     75     for (nn = 0; nn < N_THREADS; nn++) {
     76         if (pthread_join(threads[nn], NULL)) {
     77             printf("joining thread %d failed\n", nn);
     78             return 1;
     79         }
     80     }
     81     return 0;
     82 }
     83