drop use of pthread_once in mutexattr kernel support tests

[musl] / src / thread / pthread_mutexattr_setrobust.c

diff --git a/src/thread/pthread_mutexattr_setrobust.c b/src/thread/pthread_mutexattr_setrobust.c
index 04db92a..30a9ac3 100644 (file)
--- a/src/thread/pthread_mutexattr_setrobust.c
+++ b/src/thread/pthread_mutexattr_setrobust.c
@@ -1,22 +1,20 @@
 #include "pthread_impl.h"
 #include "syscall.h"
 
-static pthread_once_t check_robust_once;
-static int check_robust_result;
-
-static void check_robust()
-{
-       void *p;
-       size_t l;
-       check_robust_result = -__syscall(SYS_get_robust_list, 0, &p, &l);
-}
+static volatile int check_robust_result = -1;
 
 int pthread_mutexattr_setrobust(pthread_mutexattr_t *a, int robust)
 {
        if (robust > 1U) return EINVAL;
        if (robust) {
-               pthread_once(&check_robust_once, check_robust);
-               if (check_robust_result) return check_robust_result;
+               int r = check_robust_result;
+               if (r < 0) {
+                       void *p;
+                       size_t l;
+                       r = -__syscall(SYS_get_robust_list, 0, &p, &l);
+                       a_store(&check_robust_result, r);
+               }
+               if (r) return r;
                a->__attr |= 4;
                return 0;
        }