/* * Copyright (c) 2001-2004 Jakub Jermar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - 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. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /** @addtogroup libcia32 * @{ */ /** @file */ #ifndef LIBC_ia32_ATOMIC_H_ #define LIBC_ia32_ATOMIC_H_ static inline void atomic_inc(atomic_t *val) { asm volatile ("lock incl %0\n" : "=m" (val->count)); } static inline void atomic_dec(atomic_t *val) { asm volatile ("lock decl %0\n" : "=m" (val->count)); } static inline long atomic_postinc(atomic_t *val) { long r; asm volatile ( "movl $1, %0\n" "lock xaddl %0, %1\n" : "=r" (r), "=m" (val->count) ); return r; } static inline long atomic_postdec(atomic_t *val) { long r; asm volatile ( "movl $-1, %0\n" "lock xaddl %0, %1\n" : "=r" (r), "=m" (val->count) ); return r; } #define atomic_preinc(val) (atomic_postinc(val)+1) #define atomic_predec(val) (atomic_postdec(val)-1) #endif /** @} */