diff options
Diffstat (limited to 'include/asm-sh/atomic.h')
| -rw-r--r-- | include/asm-sh/atomic.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/asm-sh/atomic.h b/include/asm-sh/atomic.h index 3c4f805da1ac..fb627de217f2 100644 --- a/include/asm-sh/atomic.h +++ b/include/asm-sh/atomic.h @@ -87,6 +87,37 @@ static __inline__ int atomic_sub_return(int i, atomic_t * v) #define atomic_inc(v) atomic_add(1,(v)) #define atomic_dec(v) atomic_sub(1,(v)) +static inline int atomic_cmpxchg(atomic_t *v, int old, int new) +{ + int ret; + unsigned long flags; + + local_irq_save(flags); + ret = v->counter; + if (likely(ret == old)) + v->counter = new; + local_irq_restore(flags); + + return ret; +} + +#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) + +static inline int atomic_add_unless(atomic_t *v, int a, int u) +{ + int ret; + unsigned long flags; + + local_irq_save(flags); + ret = v->counter; + if (ret != u) + v->counter += a; + local_irq_restore(flags); + + return ret != u; +} +#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) + static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v) { unsigned long flags; @@ -111,4 +142,5 @@ static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v) #define smp_mb__before_atomic_inc() barrier() #define smp_mb__after_atomic_inc() barrier() +#include <asm-generic/atomic.h> #endif /* __ASM_SH_ATOMIC_H */ |