diff options
Diffstat (limited to 'src/thread/sem_trywait.c')
| -rw-r--r-- | src/thread/sem_trywait.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/thread/sem_trywait.c b/src/thread/sem_trywait.c index d0e928ef..c5370c70 100644 --- a/src/thread/sem_trywait.c +++ b/src/thread/sem_trywait.c @@ -5,7 +5,8 @@ int sem_trywait(sem_t *sem) { int val = a_fetch_add(sem->__val, -1); if (val > 0) return 0; - a_inc(sem->__val); + if (!a_fetch_add(sem->__val, 1)) + __wake(sem->__val, 1, 0); errno = EAGAIN; return -1; } |