/* Memory barrier operations. i386 version. Copyright (C) 2002 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. */ 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)); } /* 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