fix missing synchronization of pthread TSD keys with MT-fork
[musl] / 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 }