drd/tests/pth_cancel_locked.c

   1 /** Cancel a thread that holds a lock on a mutex. */
   2
   3
   4 #include <assert.h>
   5 #include <pthread.h>
   6 #include <stdio.h>
   7
   8
   9 pthread_cond_t  s_cond;
  10 pthread_mutex_t s_mutex1;
  11 pthread_mutex_t s_mutex2;
  12
  13
  14 static void* thread(void* arg)
  15 {
  16   /* Lock s_mutex2. */
  17   pthread_mutex_lock(&s_mutex2);
  18   /* Inform the main thread that s_mutex2 has been locked, and wait for pthread_cancel(). */
  19   pthread_mutex_lock(&s_mutex1);
  20   pthread_cond_signal(&s_cond);
  21   pthread_cond_wait(&s_cond, &s_mutex1);
  22   return 0;
  23 }
  24
  25 int main(int argc, char** argv)
  26 {
  27   pthread_t tid;
  28
  29   /* Initialize synchronization objects. */
  30   pthread_cond_init(&s_cond, 0);
  31   pthread_mutex_init(&s_mutex1, 0);
  32   pthread_mutex_init(&s_mutex2, 0);
  33
  34   /* Create thread. */
  35   pthread_mutex_lock(&s_mutex1);
  36   pthread_create(&tid, 0, &thread, 0);
  37
  38   /* Wait until the created thread has locked s_mutex2. */
  39   pthread_cond_wait(&s_cond, &s_mutex1);
  40   pthread_mutex_unlock(&s_mutex1);
  41
  42   /* Cancel the created thread. */
  43   pthread_cancel(tid);
  44
  45   /* Join the created thread. */
  46   pthread_join(tid, 0);
  47
  48   /* Invoke pthread_cancel() with an invalid thread ID. */
  49   pthread_cancel(tid);
  50
  51   fprintf(stderr, "Test finished.\n");
  52
  53   return 0;
  54 }