williamr@2: /* GLIB - Library of useful routines for C programming
williamr@2:  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
williamr@2:  *
williamr@2:  * g_atomic_*: atomic operations.
williamr@2:  * Copyright (C) 2003 Sebastian Wilhelmi
williamr@2:  * Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
williamr@2:  *
williamr@2:  * This library is free software; you can redistribute it and/or
williamr@2:  * modify it under the terms of the GNU Lesser General Public
williamr@2:  * License as published by the Free Software Foundation; either
williamr@2:  * version 2 of the License, or (at your option) any later version.
williamr@2:  *
williamr@2:  * This library is distributed in the hope that it will be useful,
williamr@2:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
williamr@2:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
williamr@2:  * Lesser General Public License for more details.
williamr@2:  *
williamr@2:  * You should have received a copy of the GNU Lesser General Public
williamr@2:  * License along with this library; if not, write to the
williamr@2:  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
williamr@2:  * Boston, MA 02111-1307, USA.
williamr@2:  */
williamr@2:  
williamr@2: /*
williamr@2:  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
williamr@2:  * file for a list of people on the GLib Team.  See the ChangeLog
williamr@2:  * files for a list of changes.  These files are distributed with
williamr@2:  * GLib at ftp://ftp.gtk.org/pub/gtk/.
williamr@2:  */
williamr@2:  
williamr@2: #ifndef __G_ATOMIC_H__
williamr@2: #define __G_ATOMIC_H__
williamr@2:  
williamr@2: #include <_ansi.h> 
williamr@2: #include <glib/gtypes.h>
williamr@2: 
williamr@2: G_BEGIN_DECLS
williamr@2:  
williamr@2: IMPORT_C gint     g_atomic_int_exchange_and_add         (volatile gint     *atomic, 
williamr@2: 						gint      	   val);
williamr@2: IMPORT_C void     g_atomic_int_add                      (volatile gint     *atomic, 
williamr@2: 						gint      	   val);
williamr@2: IMPORT_C gboolean g_atomic_int_compare_and_exchange     (volatile gint     *atomic, 
williamr@2: 						gint      	   oldval,
williamr@2: 						gint      	   newval);
williamr@2: IMPORT_C gboolean g_atomic_pointer_compare_and_exchange (volatile gpointer *atomic, 
williamr@2: 						gpointer  	   oldval, 
williamr@2: 						gpointer  	   newval);
williamr@2: 
williamr@2: IMPORT_C gint     g_atomic_int_get                      (volatile  gint     *atomic);
williamr@2: IMPORT_C void     g_atomic_int_set                      (volatile gint  	  *atomic,
williamr@2: 						gint               newval);
williamr@2: IMPORT_C gpointer g_atomic_pointer_get                  (volatile gpointer *atomic);
williamr@2: IMPORT_C void     g_atomic_pointer_set                  (volatile gpointer *atomic,
williamr@2: 						gpointer           newval);
williamr@2: 
williamr@2: #ifndef G_ATOMIC_OP_MEMORY_BARRIER_NEEDED
williamr@2: # define g_atomic_int_get(atomic) 		(*(atomic))
williamr@2: # define g_atomic_int_set(atomic, newval) 	((void) (*(atomic) = (newval)))
williamr@2: # define g_atomic_pointer_get(atomic) 		(*(atomic))
williamr@2: # define g_atomic_pointer_set(atomic, newval)	((void) (*(atomic) = (newval)))
williamr@2: #endif /* G_ATOMIC_OP_MEMORY_BARRIER_NEEDED */
williamr@2: 
williamr@2: #define g_atomic_int_inc(atomic) (g_atomic_int_add ((atomic), 1))
williamr@2: #define g_atomic_int_dec_and_test(atomic)				\
williamr@2:   (g_atomic_int_exchange_and_add ((atomic), -1) == 1)
williamr@2: 
williamr@2: G_END_DECLS
williamr@2:  
williamr@2: #endif /* __G_ATOMIC_H__ */