minix/common/lib/libc/atomic/atomic_add_64_nv_cas.c
Gianluca Guida b6cbf7203b Import unmodified NetBSD libc in trunk
This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.
2011-02-14 19:36:03 +00:00

64 lines
2.2 KiB
C

/* $NetBSD: atomic_add_64_nv_cas.c,v 1.5 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>
#ifdef __HAVE_ATOMIC64_OPS
uint64_t
atomic_add_64_nv(volatile uint64_t *addr, int64_t val)
{
uint64_t old, new;
do {
old = *addr;
new = old + val;
} while (atomic_cas_64(addr, old, new) != old);
return (new);
}
#undef atomic_add_64_nv
atomic_op_alias(atomic_add_64_nv,_atomic_add_64_nv)
#if defined(_LP64)
#undef atomic_add_long_nv
atomic_op_alias(atomic_add_long_nv,_atomic_add_64_nv)
__strong_alias(_atomic_add_long_nv,_atomic_add_64_nv)
#undef atomic_add_ptr_nv
atomic_op_alias(atomic_add_ptr_nv,_atomic_add_64_nv)
__strong_alias(_atomic_add_ptr_nv,_atomic_add_64_nv)
#endif /* _LP64 */
#endif