diff options
Diffstat (limited to 'include/asm-m68knommu/atomic.h')
| -rw-r--r-- | include/asm-m68knommu/atomic.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-m68knommu/atomic.h b/include/asm-m68knommu/atomic.h index 2fd33a5..3c1cc15 100644 --- a/include/asm-m68knommu/atomic.h +++ b/include/asm-m68knommu/atomic.h @@ -130,6 +130,16 @@ static inline int atomic_sub_return(int i, atomic_t * v) #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) +#define atomic_add_unless(v, a, u) \ +({ \ + int c, old; \ + c = atomic_read(v); \ + while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \ + c = old; \ + c != (u); \ +}) +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + #define atomic_dec_return(v) atomic_sub_return(1,(v)) #define atomic_inc_return(v) atomic_add_return(1,(v)) |