1 /* $NetBSD: atomic.h,v 1.3 2014/12/10 04:38:01 christos Exp $ */ 2 3 /* 4 * Copyright (C) 2013 Internet Systems Consortium, Inc. ("ISC") 5 * 6 * Permission to use, copy, modify, and/or distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH 11 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 12 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, 13 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 14 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE 15 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 16 * PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 /* Id */ 20 21 #ifndef ISC_ATOMIC_H 22 #define ISC_ATOMIC_H 1 23 24 #include <config.h> 25 #include <isc/platform.h> 26 #include <isc/types.h> 27 28 /* 29 * This routine atomically increments the value stored in 'p' by 'val', and 30 * returns the previous value. 31 */ 32 #ifdef ISC_PLATFORM_HAVEXADD 33 static __inline isc_int32_t 34 isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) { 35 return (isc_int32_t) _InterlockedExchangeAdd((long *)p, (long)val); 36 } 37 #endif 38 39 #ifdef ISC_PLATFORM_HAVEXADDQ 40 static __inline isc_int64_t 41 isc_atomic_xaddq(isc_int64_t *p, isc_int64_t val) { 42 return (isc_int64_t) _InterlockedExchangeAdd64((__int64 *)p, 43 (__int64) val); 44 } 45 #endif 46 47 /* 48 * This routine atomically stores the value 'val' in 'p'. 49 */ 50 #ifdef ISC_PLATFORM_HAVEATOMICSTORE 51 static __inline void 52 isc_atomic_store(isc_int32_t *p, isc_int32_t val) { 53 (void) _InterlockedExchange((long *)p, (long)val); 54 } 55 #endif 56 57 /* 58 * This routine atomically replaces the value in 'p' with 'val', if the 59 * original value is equal to 'cmpval'. The original value is returned in any 60 * case. 61 */ 62 #ifdef ISC_PLATFORM_HAVECMPXCHG 63 static __inline isc_int32_t 64 isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) { 65 /* beware: swap arguments */ 66 return (isc_int32_t) _InterlockedCompareExchange((long *)p, 67 (long)val, 68 (long)cmpval); 69 } 70 #endif 71 72 #endif /* ISC_ATOMIC_H */ 73