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atomic_add_8_cas.c revision 1.2.2.1 
      1  1.2.2.1     tls /*	$NetBSD: atomic_add_8_cas.c,v 1.2.2.1 2014/08/10 06:47:06 tls Exp $	*/
      2      1.2  martin 
      3      1.2  martin /*-
      4      1.2  martin  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5      1.2  martin  * All rights reserved.
      6      1.2  martin  *
      7      1.2  martin  * This code is derived from software contributed to The NetBSD Foundation
      8      1.2  martin  * by Jason R. Thorpe.
      9      1.2  martin  *
     10      1.2  martin  * Redistribution and use in source and binary forms, with or without
     11      1.2  martin  * modification, are permitted provided that the following conditions
     12      1.2  martin  * are met:
     13      1.2  martin  * 1. Redistributions of source code must retain the above copyright
     14      1.2  martin  *    notice, this list of conditions and the following disclaimer.
     15      1.2  martin  * 2. Redistributions in binary form must reproduce the above copyright
     16      1.2  martin  *    notice, this list of conditions and the following disclaimer in the
     17      1.2  martin  *    documentation and/or other materials provided with the distribution.
     18      1.2  martin  *
     19      1.2  martin  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20      1.2  martin  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21      1.2  martin  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22      1.2  martin  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23      1.2  martin  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24      1.2  martin  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25      1.2  martin  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26      1.2  martin  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27      1.2  martin  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28      1.2  martin  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29      1.2  martin  * POSSIBILITY OF SUCH DAMAGE.
     30      1.2  martin  */
     31      1.2  martin 
     32      1.2  martin #include "atomic_op_namespace.h"
     33      1.2  martin 
     34      1.2  martin #include <sys/atomic.h>
     35      1.2  martin 
     36      1.2  martin uint8_t fetch_and_add_1(volatile uint8_t *, uint8_t, ...)
     37      1.2  martin     asm("__sync_fetch_and_add_1");
     38      1.2  martin uint8_t add_and_fetch_1(volatile uint8_t *, uint8_t, ...)
     39      1.2  martin     asm("__sync_add_and_fetch_1");
     40      1.2  martin 
     41      1.2  martin uint8_t
     42      1.2  martin fetch_and_add_1(volatile uint8_t *addr, uint8_t val, ...)
     43      1.2  martin {
     44      1.2  martin 	uint8_t old, new;
     45      1.2  martin 
     46      1.2  martin 	do {
     47      1.2  martin 		old = *addr;
     48      1.2  martin 		new = old + val;
     49      1.2  martin 	} while (atomic_cas_8(addr, old, new) != old);
     50      1.2  martin 	return old;
     51      1.2  martin }
     52      1.2  martin 
     53      1.2  martin uint8_t
     54      1.2  martin add_and_fetch_1(volatile uint8_t *addr, uint8_t val, ...)
     55      1.2  martin {
     56      1.2  martin 	uint8_t old, new;
     57      1.2  martin 
     58      1.2  martin 	do {
     59      1.2  martin 		old = *addr;
     60      1.2  martin 		new = old + val;
     61      1.2  martin 	} while (atomic_cas_8(addr, old, new) != old);
     62      1.2  martin 	return new;
     63      1.2  martin }
     64  1.2.2.1     tls 
     65  1.2.2.1     tls __strong_alias(__atomic_fetch_add_1,__sync_fetch_and_add_1)
     66