atomic_and_8_cas.c revision 1.3.4.2
1 1.3.4.2 tls /* $NetBSD: atomic_and_8_cas.c,v 1.3.4.2 2014/08/19 23:45:14 tls Exp $ */ 2 1.3.4.2 tls 3 1.3.4.2 tls /*- 4 1.3.4.2 tls * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 1.3.4.2 tls * All rights reserved. 6 1.3.4.2 tls * 7 1.3.4.2 tls * This code is derived from software contributed to The NetBSD Foundation 8 1.3.4.2 tls * by Jason R. Thorpe. 9 1.3.4.2 tls * 10 1.3.4.2 tls * Redistribution and use in source and binary forms, with or without 11 1.3.4.2 tls * modification, are permitted provided that the following conditions 12 1.3.4.2 tls * are met: 13 1.3.4.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.3.4.2 tls * notice, this list of conditions and the following disclaimer. 15 1.3.4.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.4.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.3.4.2 tls * documentation and/or other materials provided with the distribution. 18 1.3.4.2 tls * 19 1.3.4.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.4.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.4.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.4.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.4.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.4.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.4.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.4.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.4.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.4.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.4.2 tls * POSSIBILITY OF SUCH DAMAGE. 30 1.3.4.2 tls */ 31 1.3.4.2 tls 32 1.3.4.2 tls #include "atomic_op_namespace.h" 33 1.3.4.2 tls 34 1.3.4.2 tls #include <sys/atomic.h> 35 1.3.4.2 tls 36 1.3.4.2 tls uint8_t fetch_and_and_1(volatile uint8_t *, uint8_t, ...) 37 1.3.4.2 tls asm("__sync_fetch_and_and_1"); 38 1.3.4.2 tls 39 1.3.4.2 tls uint8_t 40 1.3.4.2 tls fetch_and_and_1(volatile uint8_t *addr, uint8_t val, ...) 41 1.3.4.2 tls { 42 1.3.4.2 tls uint8_t old, new; 43 1.3.4.2 tls 44 1.3.4.2 tls do { 45 1.3.4.2 tls old = *addr; 46 1.3.4.2 tls new = old & val; 47 1.3.4.2 tls } while (atomic_cas_8(addr, old, new) != old); 48 1.3.4.2 tls return old; 49 1.3.4.2 tls } 50 1.3.4.2 tls 51 1.3.4.2 tls __strong_alias(__atomic_fetch_and_1,__sync_fetch_and_and_1) 52
Indexes created Mon Sep 29 18:09:42 GMT 2025