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/*
* Invoke pthread_cond_destroy() on a condition variable that is being waited
* upon.
*/
#include <assert.h>
#include <errno.h>
#include <stdio.h> // printf()
#include <pthread.h>
static pthread_mutex_t s_mutex;
static pthread_cond_t s_cond;
static int s_i;
static const char* err_to_str(int errnum)
{
switch (errnum) {
case 0: return "success";
case EBUSY: return "EBUSY";
case EINVAL: return "EINVAL";
default: return "?";
}
}
static void* thread_func(void* thread_arg)
{
pthread_mutex_lock(&s_mutex);
s_i = 1;
pthread_cond_signal(&s_cond);
while (s_i == 1)
pthread_cond_wait(&s_cond, &s_mutex);
pthread_mutex_unlock(&s_mutex);
return 0;
}
int main(int argc, char** argv)
{
pthread_t threadid;
int ret;
pthread_mutex_init(&s_mutex, 0);
pthread_cond_init(&s_cond, 0);
pthread_create(&threadid, 0, thread_func, 0);
pthread_mutex_lock(&s_mutex);
while (s_i == 0)
pthread_cond_wait(&s_cond, &s_mutex);
pthread_mutex_unlock(&s_mutex);
ret = pthread_cond_destroy(&s_cond);
fprintf(stderr, "First pthread_cond_destroy() call returned %s.\n",
err_to_str(ret));
pthread_mutex_lock(&s_mutex);
s_i = 2;
pthread_cond_signal(&s_cond);
pthread_mutex_unlock(&s_mutex);
pthread_join(threadid, 0);
ret = pthread_cond_destroy(&s_cond);
fprintf(stderr, "Second pthread_cond_destroy() call returned %s.\n",
err_to_str(ret));
pthread_mutex_destroy(&s_mutex);
return 0;
}
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