00b67f09dd
Also known as ISC bind. This import adds utilities such as host(1), dig(1), and nslookup(1), as well as many other tools and libraries. Change-Id: I035ca46e64f1965d57019e773f4ff0ef035e4aa3
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 */
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#ifndef ISC_ATOMIC_H
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#define ISC_ATOMIC_H 1
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#ifdef ISC_PLATFORM_USETHREADS
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#include <sys/atomic.h>
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#else
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#define ISC_NO_ATOMIC
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#endif
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#include <isc/types.h>
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/*
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* This routine atomically increments the value stored in 'p' by 'val', and
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* returns the previous value.
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*/
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static __inline isc_int32_t
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isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) {
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#ifdef ISC_NO_ATOMIC
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isc_int32_t oval = *p;
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*p += val;
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return oval;
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#else
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return (isc_int32_t)atomic_add_32_nv((volatile uint32_t *)p,
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(uint32_t)val) - val;
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#endif
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}
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#ifdef ISC_PLATFORM_HAVEXADDQ
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static __inline isc_int64_t
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isc_atomic_xaddq(isc_int64_t *p, isc_int64_t val) {
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#ifdef ISC_NO_ATOMIC
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isc_int64_t oval = *p;
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*p += val;
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return oval;
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#else
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return (isc_int64_t)atomic_add_64_nv((volatile uint64_t *)p,
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(uint64_t)val) - val;
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#endif
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}
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#endif
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/*
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* This routine atomically stores the value 'val' in 'p'.
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*/
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static __inline void
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isc_atomic_store(isc_int32_t *p, isc_int32_t val) {
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#ifdef ISC_NO_ATOMIC
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*p = val;
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#else
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(void)atomic_swap_32((volatile uint32_t *)p, (uint32_t)val);
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#endif
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}
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/*
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* This routine atomically replaces the value in 'p' with 'val', if the
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* original value is equal to 'cmpval'. The original value is returned in any
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* case.
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*/
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static __inline__ isc_int32_t
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isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) {
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#ifdef ISC_NO_ATOMIC
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isc_int32_t oval = *p;
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if (cmpval == oval)
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*p = val;
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return oval;
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#else
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return (isc_int32_t) atomic_cas_32((volatile uint32_t *)p,
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(uint32_t)cmpval, (uint32_t)val);
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#endif
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}
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#endif /* ISC_ATOMIC_H */
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