src/regression/pthread_rwlock-ebusy.c

   1 // commit: e5dd18319bbd47c89aac5e1571771958a43e067d 2011-03-08
   2 // pthread_rwlock_try* should fail with EBUSY
   3 #include <pthread.h>
   4 #include <errno.h>
   5 #include <string.h>
   6 #include "test.h"
   7
   8 #define T(f) if ((r=(f))) t_error(#f " failed: %s\n", strerror(r))
   9
  10 static void *tryrdlock(void *arg)
  11 {
  12         int r = pthread_rwlock_tryrdlock(arg);
  13         if (r != EBUSY)
  14                 t_error("tryrdlock for wrlocked lock returned %s, want EBUSY\n", strerror(r));
  15         return 0;
  16 }
  17
  18 static void *trywrlock(void *arg)
  19 {
  20         int r = pthread_rwlock_trywrlock(arg);
  21         if (r != EBUSY)
  22                 t_error("trywrlock for rdlocked lock returned %s, want EBUSY\n", strerror(r));
  23         return 0;
  24 }
  25
  26 int main(void)
  27 {
  28         pthread_t t;
  29         pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
  30         void *p;
  31         int r;
  32
  33         T(pthread_rwlock_rdlock(&rw));
  34         T(pthread_create(&t, 0, trywrlock, &rw));
  35         T(pthread_join(t, &p));
  36         T(pthread_rwlock_unlock(&rw));
  37
  38         T(pthread_rwlock_wrlock(&rw));
  39         T(pthread_create(&t, 0, tryrdlock, &rw));
  40         T(pthread_join(t, &p));
  41         T(pthread_rwlock_unlock(&rw));
  42
  43         return t_status;
  44 }