1/*- 2 * Copyright (c) 2003 Jake Burkholder <jake@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Neither the name of the author nor the names of its contributors 11 * may be used to endorse or promote products derived from this software 12 * without specific prior written permission. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/10.2/lib/libkse/arch/sparc64/include/atomic_ops.h 174112 2007-11-30 17:20:29Z deischen $ 27 */ 28 29#ifndef _ATOMIC_OPS_H_ 30#define _ATOMIC_OPS_H_ 31 32#include <machine/atomic.h> 33 34/* 35 * Atomic swap: 36 * Atomic (tmp = *dst, *dst = val), then *res = tmp 37 * 38 * void atomic_swap_long(long *dst, long val, long *res); 39 */ 40static __inline void 41atomic_swap_long(volatile long *dst, long val, long *res) 42{ 43 long tmp; 44 long r; 45 46 tmp = *dst; 47 for (;;) { 48 r = atomic_cas_64(dst, tmp, val); 49 if (r == tmp) 50 break; 51 tmp = r; 52 } 53 *res = tmp; 54} 55 56static __inline void 57atomic_swap_int(volatile int *dst, int val, int *res) 58{ 59 int tmp; 60 int r; 61 62 tmp = *dst; 63 for (;;) { 64 r = atomic_cas_32(dst, tmp, val); 65 if (r == tmp) 66 break; 67 tmp = r; 68 } 69 *res = tmp; 70} 71 72#define atomic_swap_ptr(dst, val, res) \ 73 atomic_swap_long((volatile long *)dst, (long)val, (long *)res) 74 75#endif 76