drd/tests/pth_cond_destroy_busy.c

   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
  11 static pthread_mutex_t s_mutex;
  12 static pthread_cond_t  s_cond;
  13 static int             s_i;
  14
  15 static 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
  25 static 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
  37 int 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 }