1/*
2 * Invoke pthread_cond_destroy() on a condition variable that is being waited
3 * upon.
4 */
5
6#include <assert.h>
7#include <errno.h>
8#include <stdio.h>     // printf()
9#include <pthread.h>
10
11static pthread_mutex_t s_mutex;
12static pthread_cond_t  s_cond;
13static int             s_i;
14
15static const char* err_to_str(int errnum)
16{
17  switch (errnum) {
18  case 0:      return "success";
19  case EBUSY:  return "EBUSY";
20  case EINVAL: return "EINVAL";
21  default:     return "?";
22  }
23}
24
25static void* thread_func(void* thread_arg)
26{
27  pthread_mutex_lock(&s_mutex);
28  s_i = 1;
29  pthread_cond_signal(&s_cond);
30  while (s_i == 1)
31    pthread_cond_wait(&s_cond, &s_mutex);
32  pthread_mutex_unlock(&s_mutex);
33
34  return 0;
35}
36
37int main(int argc, char** argv)
38{
39  pthread_t threadid;
40  int ret;
41
42  pthread_mutex_init(&s_mutex, 0);
43  pthread_cond_init(&s_cond, 0);
44
45  pthread_create(&threadid, 0, thread_func, 0);
46
47  pthread_mutex_lock(&s_mutex);
48  while (s_i == 0)
49    pthread_cond_wait(&s_cond, &s_mutex);
50  pthread_mutex_unlock(&s_mutex);
51
52  ret = pthread_cond_destroy(&s_cond);
53  fprintf(stderr, "First pthread_cond_destroy() call returned %s.\n",
54          err_to_str(ret));
55
56  pthread_mutex_lock(&s_mutex);
57  s_i = 2;
58  pthread_cond_signal(&s_cond);
59  pthread_mutex_unlock(&s_mutex);
60
61  pthread_join(threadid, 0);
62
63  ret = pthread_cond_destroy(&s_cond);
64  fprintf(stderr, "Second pthread_cond_destroy() call returned %s.\n",
65          err_to_str(ret));
66  pthread_mutex_destroy(&s_mutex);
67
68  return 0;
69}
70