mirror of
https://github.com/Stichting-MINIX-Research-Foundation/netbsd.git
synced 2025-08-10 06:29:51 -04:00
74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* 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 */
|