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/* NetBSD: atomic.h,v 1.3 2010/12/25 15:26:32 christos Exp */
#ifndef ISC_ATOMIC_H
#define ISC_ATOMIC_H 1
#ifdef ISC_PLATFORM_USETHREADS
#include <sys/atomic.h>
#else
#define ISC_NO_ATOMIC
#endif
#include <isc/types.h>
/*
* This routine atomically increments the value stored in 'p' by 'val', and
* returns the previous value.
*/
static __inline isc_int32_t
isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) {
#ifdef ISC_NO_ATOMIC
isc_int32_t oval = *p;
*p += val;
return oval;
#else
return (isc_int32_t)atomic_add_32_nv((volatile uint32_t *)p,
(uint32_t)val) - val;
#endif
}
#ifdef ISC_PLATFORM_HAVEXADDQ
static __inline isc_int64_t
isc_atomic_xaddq(isc_int64_t *p, isc_int64_t val) {
#ifdef ISC_NO_ATOMIC
isc_int64_t oval = *p;
*p += val;
return oval;
#else
return (isc_int64_t)atomic_add_64_nv((volatile uint64_t *)p,
(uint64_t)val) - val;
#endif
}
#endif
/*
* This routine atomically stores the value 'val' in 'p'.
*/
static __inline void
isc_atomic_store(isc_int32_t *p, isc_int32_t val) {
#ifdef ISC_NO_ATOMIC
*p = val;
#else
(void)atomic_swap_32((volatile uint32_t *)p, (uint32_t)val);
#endif
}
/*
* This routine atomically replaces the value in 'p' with 'val', if the
* original value is equal to 'cmpval'. The original value is returned in any
* case.
*/
static __inline__ isc_int32_t
isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) {
#ifdef ISC_NO_ATOMIC
isc_int32_t oval = *p;
if (cmpval == oval)
*p = val;
return oval;
#else
return (isc_int32_t) atomic_cas_32((volatile uint32_t *)p,
(uint32_t)cmpval, (uint32_t)val);
#endif
}
#endif /* ISC_ATOMIC_H */
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