2 * Copyright (C) 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
17 /* $Id: atomic.h,v 1.6 2007/06/18 23:47:47 tbox Exp $ */
20 #define ISC_ATOMIC_H 1
22 #include <isc/platform.h>
23 #include <isc/types.h>
26 * static inline isc_int32_t
27 * isc_atomic_xadd(isc_int32_t *p, isc_int32_t val);
29 * This routine atomically increments the value stored in 'p' by 'val', and
30 * returns the previous value.
33 * isc_atomic_store(void *p, isc_int32_t val);
35 * This routine atomically stores the value 'val' in 'p'.
37 * static inline isc_int32_t
38 * isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val);
40 * This routine atomically replaces the value in 'p' with 'val', if the
41 * original value is equal to 'cmpval'. The original value is returned in any
47 #include <sys/atomic_op.h>
49 #define isc_atomic_xadd(p, v) fetch_and_add(p, v)
50 #define isc_atomic_store(p, v) _clear_lock(p, v)
57 isc_atomic_cmpxchg(atomic_p p, int old, int new) {
65 if (compare_and_swap(p, &orig, new))
70 #elif defined(ISC_PLATFORM_USEGCCASM) || defined(ISC_PLATFORM_USEMACASM)
71 static inline isc_int32_t
72 isc_atomic_xadd(isc_int32_t *p, isc_int32_t val) {
76 #ifdef ISC_PLATFORM_USEMACASM
100 isc_atomic_store(void *p, isc_int32_t val) {
102 #ifdef ISC_PLATFORM_USEMACASM
121 static inline isc_int32_t
122 isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val) {
126 #ifdef ISC_PLATFORM_USEMACASM
148 : "r"(p), "r"(cmpval), "r"(val)
157 #error "unsupported compiler. disable atomic ops by --disable-atomic"
160 #endif /* ISC_ATOMIC_H */