diff options
Diffstat (limited to 'pk/atomic.h')
| -rw-r--r-- | pk/atomic.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/pk/atomic.h b/pk/atomic.h index c0c1d84..8e80c78 100644 --- a/pk/atomic.h +++ b/pk/atomic.h @@ -43,6 +43,18 @@ static inline long atomic_swap(atomic_t* a, long val) #endif } +static inline long atomic_cas(atomic_t* a, long compare, long swap) +{ +#ifdef PK_ENABLE_ATOMICS + return __sync_val_compare_and_swap(&a->val, compare, swap); +#else + long ret = atomic_read(a); + if (ret == compare) + atomic_set(a, swap); + return ret; +#endif +} + static inline void spinlock_lock(spinlock_t* lock) { do |