helgrind/tests/bug484480.c

   1 #include <pthread.h>
   2 #include <semaphore.h>
   3 #include <stdio.h>
   4
   5 static char* result;
   6 static sem_t sem;
   7
   8 static void* func(void* data)
   9 {
  10    result = "Finished!";
  11    sem_post(&sem);
  12    return NULL;
  13 }
  14
  15 int main(void)
  16 {
  17    sem_init(&sem, 0, 0);
  18
  19    pthread_t tid;
  20    pthread_create(&tid, NULL, func, NULL);
  21
  22    while (sem_trywait(&sem))
  23       ; // do nothing but keep retrying
  24
  25    /* The above loop could be replaced this instead:
  26     * if (sem_trywait(&sem))
  27     *    sem_wait(&sem);
  28     */
  29
  30    printf("%s\n", result);
  31
  32    pthread_join(tid, NULL);
  33 }