1/* grcboxprivate.h: Reference counted data
2 *
3 * Copyright 2018 Emmanuele Bassi
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19#pragma once
20
21#include "gtypes.h"
22#include "grcbox.h"
23
24G_BEGIN_DECLS
25
26typedef struct {
27 grefcount ref_count;
28
29 gsize mem_size;
30 gsize private_offset;
31
32#ifndef G_DISABLE_ASSERT
33 /* A "magic" number, used to perform additional integrity
34 * checks on the allocated data
35 */
36 guint32 magic;
37#endif
38} GRcBox;
39
40typedef struct {
41 gatomicrefcount ref_count;
42
43 gsize mem_size;
44 gsize private_offset;
45
46#ifndef G_DISABLE_ASSERT
47 guint32 magic;
48#endif
49} GArcBox;
50
51#define G_BOX_MAGIC 0x44ae2bf0
52
53/* Keep the two refcounted boxes identical in size */
54G_STATIC_ASSERT (sizeof (GRcBox) == sizeof (GArcBox));
55
56/* This is the default alignment we use when allocating the
57 * refcounted memory blocks; it's similar to the alignment
58 * guaranteed by the malloc() in GNU's libc and by the GSlice
59 * allocator
60 */
61#define STRUCT_ALIGNMENT (2 * sizeof (gsize))
62
63#define G_RC_BOX_SIZE sizeof (GRcBox)
64#define G_ARC_BOX_SIZE sizeof (GArcBox)
65
66gpointer g_rc_box_alloc_full (gsize block_size,
67 gsize alignment,
68 gboolean atomic,
69 gboolean clear);
70
71G_END_DECLS
72

source code of gtk/subprojects/glib/glib/grcboxprivate.h