diff options
Diffstat (limited to 'libbcachefs/two_state_shared_lock.h')
-rw-r--r-- | libbcachefs/two_state_shared_lock.h | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/libbcachefs/two_state_shared_lock.h b/libbcachefs/two_state_shared_lock.h index 90580177..7f647846 100644 --- a/libbcachefs/two_state_shared_lock.h +++ b/libbcachefs/two_state_shared_lock.h @@ -36,15 +36,14 @@ static inline void bch2_two_state_unlock(two_state_lock_t *lock, int s) static inline bool bch2_two_state_trylock(two_state_lock_t *lock, int s) { long i = s ? 1 : -1; - long v = atomic_long_read(&lock->v), old; + long old; + old = atomic_long_read(&lock->v); do { - old = v; - - if (i > 0 ? v < 0 : v > 0) + if (i > 0 ? old < 0 : old > 0) return false; - } while ((v = atomic_long_cmpxchg_acquire(&lock->v, - old, old + i)) != old); + } while (!atomic_long_try_cmpxchg_acquire(&lock->v, &old, old + i)); + return true; } |