/* 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__ */