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1 office 1 /* GObject - GLib Type, Object, Parameter and Signal Library
2 * Copyright (C) 2009 Benjamin Otte <otte@gnome.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General
15 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17 #ifndef __G_ATOMIC_ARRAY_H__
18 #define __G_ATOMIC_ARRAY_H__
19  
20 #if !defined (__GLIB_GOBJECT_H_INSIDE__) && !defined (GOBJECT_COMPILATION)
21 #error "Only <glib-object.h> can be included directly."
22 #endif
23  
24 #include <glib/glib.h>
25  
26 G_BEGIN_DECLS
27  
28 #define G_ATOMIC_ARRAY_DATA_SIZE(mem) (*((gsize *) (mem) - 1))
29  
30 typedef struct _GAtomicArray GAtomicArray;
31 struct _GAtomicArray {
32 volatile gpointer data; /* elements - atomic */
33 };
34  
35 void _g_atomic_array_init (GAtomicArray *array);
36 gpointer _g_atomic_array_copy (GAtomicArray *array,
37 gsize header_size,
38 gsize additional_element_size);
39 void _g_atomic_array_update (GAtomicArray *array,
40 gpointer new_data);
41  
42 #define G_ATOMIC_ARRAY_GET_LOCKED(_array, _type) ((_type *)((_array)->data))
43  
44 #define G_ATOMIC_ARRAY_DO_TRANSACTION(_array, _type, _C_) G_STMT_START { \
45 volatile gpointer *_datap = &(_array)->data; \
46 _type *transaction_data, *__check; \
47 \
48 __check = g_atomic_pointer_get (_datap); \
49 do { \
50 transaction_data = __check; \
51 {_C_;} \
52 __check = g_atomic_pointer_get (_datap); \
53 } while (transaction_data != __check); \
54 } G_STMT_END
55  
56 G_END_DECLS
57  
58 #endif /* __G_ATOMIC_ARRAY_H__ */