atomic_add_32_cas.c revision 1.7 
11.7Sjoerg/*	$NetBSD: atomic_add_32_cas.c,v 1.7 2014/01/29 15:59:11 joerg Exp $	*/
21.2Sad
31.2Sad/*-
41.2Sad * Copyright (c) 2007 The NetBSD Foundation, Inc.
51.2Sad * All rights reserved.
61.2Sad *
71.2Sad * This code is derived from software contributed to The NetBSD Foundation
81.2Sad * by Jason R. Thorpe.
91.2Sad *
101.2Sad * Redistribution and use in source and binary forms, with or without
111.2Sad * modification, are permitted provided that the following conditions
121.2Sad * are met:
131.2Sad * 1. Redistributions of source code must retain the above copyright
141.2Sad *    notice, this list of conditions and the following disclaimer.
151.2Sad * 2. Redistributions in binary form must reproduce the above copyright
161.2Sad *    notice, this list of conditions and the following disclaimer in the
171.2Sad *    documentation and/or other materials provided with the distribution.
181.2Sad *
191.2Sad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
201.2Sad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
211.2Sad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
221.2Sad * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
231.2Sad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
241.2Sad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
251.2Sad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
261.2Sad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
271.2Sad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
281.2Sad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
291.2Sad * POSSIBILITY OF SUCH DAMAGE.
301.2Sad */
311.2Sad
321.2Sad#include "atomic_op_namespace.h"
331.2Sad
341.2Sad#include <sys/atomic.h>
351.2Sad
361.7Sjoerguint32_t fetch_and_add_4(volatile uint32_t *, uint32_t, ...)
371.7Sjoerg    asm("__sync_fetch_and_add_4");
381.6Smatt
391.6Smattuint32_t
401.7Sjoergfetch_and_add_4(volatile uint32_t *addr, uint32_t val, ...)
411.2Sad{
421.2Sad	uint32_t old, new;
431.2Sad
441.2Sad	do {
451.2Sad		old = *addr;
461.2Sad		new = old + val;
471.2Sad	} while (atomic_cas_32(addr, old, new) != old);
481.6Smatt	return old;
491.6Smatt}
501.6Smatt
511.6Smattvoid
521.6Smattatomic_add_32(volatile uint32_t *addr, int32_t val)
531.6Smatt{
541.7Sjoerg	(void) fetch_and_add_4(addr, val);
551.2Sad}
561.2Sad
571.2Sad#undef atomic_add_32
581.2Sadatomic_op_alias(atomic_add_32,_atomic_add_32)
591.2Sad
601.2Sad#undef atomic_add_int
611.2Sadatomic_op_alias(atomic_add_int,_atomic_add_32)
621.2Sad__strong_alias(_atomic_add_int,_atomic_add_32)
631.2Sad
641.2Sad#if !defined(_LP64)
651.2Sad#undef atomic_add_long
661.2Sadatomic_op_alias(atomic_add_long,_atomic_add_32)
671.2Sad__strong_alias(_atomic_add_long,_atomic_add_32)
681.2Sad
691.2Sad#undef atomic_add_ptr
701.2Sadatomic_op_alias(atomic_add_ptr,_atomic_add_32)
711.2Sad__strong_alias(_atomic_add_ptr,_atomic_add_32)
721.2Sad#endif /* _LP64 */
73