62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
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/* $NetBSD: atomic_swap_64_cas.c,v 1.5 2008/04/28 20:22:53 martin Exp $ */
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/*-
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* Copyright (c) 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atomic_op_namespace.h"
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#include <sys/atomic.h>
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#ifdef __HAVE_ATOMIC64_OPS
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uint64_t
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atomic_swap_64(volatile uint64_t *addr, uint64_t new)
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{
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uint64_t old;
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do {
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old = *addr;
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} while (atomic_cas_64(addr, old, new) != old);
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return (old);
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}
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#undef atomic_swap_64
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atomic_op_alias(atomic_swap_64,_atomic_swap_64)
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#if defined(_LP64)
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#undef atomic_swap_ulong
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atomic_op_alias(atomic_swap_ulong,_atomic_swap_64)
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__strong_alias(_atomic_swap_ulong,_atomic_swap_64)
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#undef atomic_swap_ptr
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atomic_op_alias(atomic_swap_ptr,_atomic_swap_64)
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__strong_alias(_atomic_swap_ptr,_atomic_swap_64)
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#endif /* _LP64 */
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#endif
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