1/* GLIB sliced memory - fast threaded memory chunk allocator
2 * Copyright (C) 2005 Tim Janik
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 2.1 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 Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17
18#ifndef __G_SLICE_H__
19#define __G_SLICE_H__
20
21#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
22#error "Only <glib.h> can be included directly."
23#endif
24
25#include <glib/gtypes.h>
26#include <string.h>
27
28G_BEGIN_DECLS
29
30/* slices - fast allocation/release of small memory blocks
31 */
32GLIB_AVAILABLE_IN_ALL
33gpointer g_slice_alloc (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
34GLIB_AVAILABLE_IN_ALL
35gpointer g_slice_alloc0 (gsize block_size) G_GNUC_MALLOC G_GNUC_ALLOC_SIZE(1);
36GLIB_AVAILABLE_IN_ALL
37gpointer g_slice_copy (gsize block_size,
38 gconstpointer mem_block) G_GNUC_ALLOC_SIZE(1);
39GLIB_AVAILABLE_IN_ALL
40void g_slice_free1 (gsize block_size,
41 gpointer mem_block);
42GLIB_AVAILABLE_IN_ALL
43void g_slice_free_chain_with_offset (gsize block_size,
44 gpointer mem_chain,
45 gsize next_offset);
46#define g_slice_new(type) ((type*) g_slice_alloc (sizeof (type)))
47
48/* Allow the compiler to inline memset(). Since the size is a constant, this
49 * can significantly improve performance. */
50#if defined (__GNUC__) && (__GNUC__ >= 2) && defined (__OPTIMIZE__)
51# define g_slice_new0(type) \
52 (type *) (G_GNUC_EXTENSION ({ \
53 gsize __s = sizeof (type); \
54 gpointer __p; \
55 __p = g_slice_alloc (__s); \
56 memset (__p, 0, __s); \
57 __p; \
58 }))
59#else
60# define g_slice_new0(type) ((type*) g_slice_alloc0 (sizeof (type)))
61#endif
62
63/* MemoryBlockType *
64 * g_slice_dup (MemoryBlockType,
65 * MemoryBlockType *mem_block);
66 * g_slice_free (MemoryBlockType,
67 * MemoryBlockType *mem_block);
68 * g_slice_free_chain (MemoryBlockType,
69 * MemoryBlockType *first_chain_block,
70 * memory_block_next_field);
71 * pseudo prototypes for the macro
72 * definitions following below.
73 */
74
75/* we go through extra hoops to ensure type safety */
76#define g_slice_dup(type, mem) \
77 (1 ? (type*) g_slice_copy (sizeof (type), (mem)) \
78 : ((void) ((type*) 0 == (mem)), (type*) 0))
79#define g_slice_free(type, mem) \
80G_STMT_START { \
81 if (1) g_slice_free1 (sizeof (type), (mem)); \
82 else (void) ((type*) 0 == (mem)); \
83} G_STMT_END
84#define g_slice_free_chain(type, mem_chain, next) \
85G_STMT_START { \
86 if (1) g_slice_free_chain_with_offset (sizeof (type), \
87 (mem_chain), G_STRUCT_OFFSET (type, next)); \
88 else (void) ((type*) 0 == (mem_chain)); \
89} G_STMT_END
90
91/* --- internal debugging API --- */
92typedef enum {
93 G_SLICE_CONFIG_ALWAYS_MALLOC = 1,
94 G_SLICE_CONFIG_BYPASS_MAGAZINES,
95 G_SLICE_CONFIG_WORKING_SET_MSECS,
96 G_SLICE_CONFIG_COLOR_INCREMENT,
97 G_SLICE_CONFIG_CHUNK_SIZES,
98 G_SLICE_CONFIG_CONTENTION_COUNTER
99} GSliceConfig;
100
101GLIB_DEPRECATED_IN_2_34
102void g_slice_set_config (GSliceConfig ckey, gint64 value);
103GLIB_DEPRECATED_IN_2_34
104gint64 g_slice_get_config (GSliceConfig ckey);
105GLIB_DEPRECATED_IN_2_34
106gint64* g_slice_get_config_state (GSliceConfig ckey, gint64 address, guint *n_values);
107
108#ifdef G_ENABLE_DEBUG
109GLIB_AVAILABLE_IN_ALL
110void g_slice_debug_tree_statistics (void);
111#endif
112
113G_END_DECLS
114
115#endif /* __G_SLICE_H__ */
116

source code of include/glib-2.0/glib/gslice.h