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MFC r260175:

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Implement atomic_swap_<type>.
This commit is contained in:
marcel 2014-02-16 23:08:21 +00:00
parent 2aad389c5a
commit 4bb58e4f5d
1 changed files with 28 additions and 0 deletions
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28
sys/ia64/include/atomic.h
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@ -386,4 +386,32 @@ atomic_fetchadd_long(volatile u_long *p, u_long v)
return (value);
}
/*
* <type> atomic_swap_<type>(volatile <type> *p, <type> v);
*/
static __inline uint32_t
atomic_swap_32(volatile uint32_t *p, uint32_t v)
{
uint32_t r;
__asm __volatile ("xchg4 %0 = %3, %2;;" : "=r"(r), "=m"(*p) :
"r"(v), "m"(*p) : "memory");
return (r);
}
static __inline uint64_t
atomic_swap_64(volatile uint64_t *p, uint64_t v)
{
uint64_t r;
__asm __volatile ("xchg8 %0 = %3, %2;;" : "=r"(r), "=m"(*p) :
"r"(v), "m"(*p) : "memory");
return (r);
}
#define atomic_swap_int atomic_swap_32
#define atomic_swap_long atomic_swap_64
#define atomic_swap_ptr atomic_swap_64
#endif /* ! _MACHINE_ATOMIC_H_ */