helgrind/tests/hg02_deadlock.c

   1 /* Simple possible deadlock */
   2 #include <pthread.h>
   3
   4 static pthread_mutex_t m1 = PTHREAD_MUTEX_INITIALIZER;
   5 static pthread_mutex_t m2 = PTHREAD_MUTEX_INITIALIZER;
   6
   7 static void *t1(void *v)
   8 {
   9         pthread_mutex_lock(&m1);
  10         pthread_mutex_lock(&m2);
  11         pthread_mutex_unlock(&m1);
  12         pthread_mutex_unlock(&m2);
  13
  14         return 0;
  15 }
  16
  17 static void *t2(void *v)
  18 {
  19         pthread_mutex_lock(&m2);
  20         pthread_mutex_lock(&m1);
  21         pthread_mutex_unlock(&m1);
  22         pthread_mutex_unlock(&m2);
  23
  24         return 0;
  25 }
  26
  27 int main()
  28 {
  29         pthread_t a, b;
  30
  31         /* prevent spurious messages from the dynamic linker */
  32         pthread_mutex_lock(&m1);
  33         pthread_mutex_unlock(&m1);
  34
  35         pthread_create(&a, NULL, t1, NULL);
  36         pthread_create(&b, NULL, t2, NULL);
  37
  38         pthread_join(a, NULL);
  39         pthread_join(b, NULL);
  40
  41         return 0;
  42 }
  43