test_pthread_once.c revision e16cb84e2324f05334d18dcf5956f20f44262b62 
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
35static pthread_once_t   once = PTHREAD_ONCE_INIT;
36
37static int      global_count = 0;
38
39static void
40once_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
51static void*
52thread_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
63int  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