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
once_function(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*
thread_function(void * arg)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
main(void)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