Merge branch 'master' of git.savannah.gnu.org:/srv/git/hurd/libpthread

1 files changed, 40 insertions, 0 deletions

diff --git a/sysdeps/i386/bits/memory.h b/sysdeps/i386/bits/memory.h
new file mode 100644
index 0000000..932c408
--- /dev/null
+++ b/sysdeps/i386/bits/memory.h
@@ -0,0 +1,40 @@
+/* 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