diff options
Diffstat (limited to 'src/thread/sem_trywait.c')
| -rw-r--r-- | src/thread/sem_trywait.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c index c5370c70..beb7aa5d 100644 --- a/src/thread/sem_trywait.c +++ b/src/thread/sem_trywait.c @@ -3,9 +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)) + if (a_fetch_add(sem->__val, -1) > 0) return 0; + if (!a_fetch_add(sem->__val, 1) && sem->__val[1]) __wake(sem->__val, 1, 0); errno = EAGAIN; return -1; |