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/* Memory barrier operations. i386 version.
Copyright (C) 2002, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _BITS_MEMORY_H
#define _BITS_MEMORY_H 1
/* Prevent read and write reordering across this function. */
static inline void
__memory_barrier (void)
{
int i;
/* Any lock'ed instruction will do. We just do a simple
increment. */
__asm__ __volatile ("lock; incl %0" : "=m" (i) : "m" (i) : "memory");
}
/* Prevent read reordering across this function. */
#define __memory_read_barrier __memory_barrier
/* Prevent write reordering across this function. */
#define __memory_write_barrier __memory_barrier
#endif
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