minix/common/lib/libc/atomic/atomic_inc_32_nv_cas.c

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/* $NetBSD: atomic_inc_32_nv_cas.c,v 1.3 2008/04/28 20:22:52 martin Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "atomic_op_namespace.h"
#include <sys/atomic.h>
uint32_t
atomic_inc_32_nv(volatile uint32_t *addr)
{
uint32_t old, new;
do {
old = *addr;
new = old + 1;
} while (atomic_cas_32(addr, old, new) != old);
return (new);
}
#undef atomic_inc_32_nv
atomic_op_alias(atomic_inc_32_nv,_atomic_inc_32_nv)
#undef atomic_inc_uint_nv
atomic_op_alias(atomic_inc_uint_nv,_atomic_inc_32_nv)
__strong_alias(_atomic_inc_uint_nv,_atomic_inc_32_nv)
#if !defined(_LP64)
#undef atomic_inc_ulong_nv
atomic_op_alias(atomic_inc_ulong_nv,_atomic_inc_32_nv)
__strong_alias(_atomic_inc_ulong_nv,_atomic_inc_32_nv)
#undef atomic_inc_ptr_nv
atomic_op_alias(atomic_inc_ptr_nv,_atomic_inc_32_nv)
__strong_alias(_atomic_inc_ptr_nv,_atomic_inc_32_nv)
#endif /* _LP64 */