diff options
Diffstat (limited to 'include/asm-m32r/atomic.h')
| -rw-r--r-- | include/asm-m32r/atomic.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h index bfff69a4993..3122fe106f0 100644 --- a/include/asm-m32r/atomic.h +++ b/include/asm-m32r/atomic.h @@ -242,6 +242,28 @@ static __inline__ int atomic_dec_return(atomic_t *v) */ #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) +#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) +#define atomic_xchg(v, new) (xchg(&((v)->counter), 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) + static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t *addr) { unsigned long flags; @@ -292,4 +314,5 @@ static __inline__ void atomic_set_mask(unsigned long mask, atomic_t *addr) #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() +#include <asm-generic/atomic.h> #endif /* _ASM_M32R_ATOMIC_H */ |