diff options
Diffstat (limited to 'include/asm-x86_64/atomic.h')
| -rw-r--r-- | include/asm-x86_64/atomic.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h index fc4c5956e1e..0866ef67f19 100644 --- a/include/asm-x86_64/atomic.h +++ b/include/asm-x86_64/atomic.h @@ -360,6 +360,27 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v) return atomic_add_return(-i,v); } +#define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new)) + +/** + * atomic_add_unless - add unless the number is a given value + * @v: pointer of type atomic_t + * @a: the amount to add to v... + * @u: ...unless v is equal to u. + * + * Atomically adds @a to @v, so long as it was not @u. + * Returns non-zero if @v was not @u, and zero otherwise. + */ +#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_inc_return(v) (atomic_add_return(1,v)) #define atomic_dec_return(v) (atomic_sub_return(1,v)) |