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 } 70
