src/thread/pthread_mutexattr_setrobust.c

   1 #include "pthread_impl.h"
   2 #include "syscall.h"
   3
   4 static volatile int check_robust_result = -1;
   5
   6 int pthread_mutexattr_setrobust(pthread_mutexattr_t *a, int robust)
   7 {
   8         if (robust > 1U) return EINVAL;
   9         if (robust) {
  10                 int r = check_robust_result;
  11                 if (r < 0) {
  12                         void *p;
  13                         size_t l;
  14                         r = -__syscall(SYS_get_robust_list, 0, &p, &l);
  15                         a_store(&check_robust_result, r);
  16                 }
  17                 if (r) return r;
  18                 a->__attr |= 4;
  19                 return 0;
  20         }
  21         a->__attr &= ~4;
  22         return 0;
  23 }