diff options
Diffstat (limited to 'include/linux/semaphore.h')
| -rw-r--r-- | include/linux/semaphore.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h index 9cae64b00d6b..537b20957ca3 100644 --- a/include/linux/semaphore.h +++ b/include/linux/semaphore.h @@ -48,4 +48,18 @@ extern int __must_check down_trylock(struct semaphore *sem); extern int __must_check down_timeout(struct semaphore *sem, long jiffies); extern void up(struct semaphore *sem); +/** + * down_try - try to down a semaphore, but don't block + * @sem: the semaphore + * + * This is equivalent to down_trylock(), but has the same return codes as + * spin_trylock and mutex_trylock: 1 if semaphore acquired, 0 if not. + * + * down_trylock() with its confusing return codes will be deprecated + * soon. It will not be missed. + */ +static inline int __must_check down_try(struct semaphore *sem) +{ + return !down_trylock(sem); +} #endif /* __LINUX_SEMAPHORE_H */ |