floating point environment, untested

[oweals/musl.git] / src / thread / sem_trywait.c

diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c
index c5370c70a7f397751d7a124df03a5c1afe78eec9..dd8f57e36a0bd54a60a5b4c21516b9a1b6a8bba5 100644 (file)
--- a/src/thread/sem_trywait.c
+++ b/src/thread/sem_trywait.c
@@ -3,10 +3,8 @@
 
 int sem_trywait(sem_t *sem)
 {
-       int val = a_fetch_add(sem->__val, -1);
-       if (val > 0) return 0;
-       if (!a_fetch_add(sem->__val, 1))
-               __wake(sem->__val, 1, 0);
+       int val = sem->__val[0];
+       if (val>0 && a_cas(sem->__val, val, val-1)==val) return 0;
        errno = EAGAIN;
        return -1;
 }