/* GLIB - Library of useful routines for C programming

 * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald

 *

 * g_atomic_*: atomic operations.

 * Copyright (C) 2003 Sebastian Wilhelmi

 * Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/*

 * Modified by the GLib Team and others 1997-2000.  See the AUTHORS

 * file for a list of people on the GLib Team.  See the ChangeLog

 * files for a list of changes.  These files are distributed with

 * GLib at ftp://ftp.gtk.org/pub/gtk/.

 */

#ifndef __G_ATOMIC_H__

#define __G_ATOMIC_H__

#include <_ansi.h> 

#include <glib/gtypes.h>

G_BEGIN_DECLS

IMPORT_C gint     g_atomic_int_exchange_and_add         (volatile gint     *atomic, 

						gint      	   val);

IMPORT_C void     g_atomic_int_add                      (volatile gint     *atomic, 

						gint      	   val);

IMPORT_C gboolean g_atomic_int_compare_and_exchange     (volatile gint     *atomic, 

						gint      	   oldval,

						gint      	   newval);

IMPORT_C gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 

						gpointer  	   oldval, 

						gpointer  	   newval);

IMPORT_C gint     g_atomic_int_get                      (volatile  gint     *atomic);

IMPORT_C void     g_atomic_int_set                      (volatile gint  	  *atomic,

						gint               newval);

IMPORT_C gpointer g_atomic_pointer_get                  (volatile gpointer *atomic);

IMPORT_C void     g_atomic_pointer_set                  (volatile gpointer *atomic,

						gpointer           newval);

#ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED

# define g_atomic_int_get(atomic) 		(*(atomic))

# define g_atomic_int_set(atomic, newval) 	((void) (*(atomic) = (newval)))

# define g_atomic_pointer_get(atomic) 		(*(atomic))

# define g_atomic_pointer_set(atomic, newval)	((void) (*(atomic) = (newval)))

#endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */

#define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1))

#define g_atomic_int_dec_and_test(atomic)				\

  (g_atomic_int_exchange_and_add ((atomic), -1) == 1)

G_END_DECLS

#endif /* __G_ATOMIC_H__ */