1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* region-allocator.h -- region based memory allocator.
*
* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
*
* See LICENSE for the license.
*
*/
#ifndef _REGION_ALLOCATOR_H_
#define _REGION_ALLOCATOR_H_
#include <stdio.h>
typedef struct region region_type;
#define DEFAULT_CHUNK_SIZE 4096
#define DEFAULT_LARGE_OBJECT_SIZE (DEFAULT_CHUNK_SIZE / 8)
#define DEFAULT_INITIAL_CLEANUP_SIZE 16
/*
* mmap allocator constants
*
*/
#ifdef USE_MMAP_ALLOC
/* header starts with size_t containing allocated size info and has at least 16 bytes to align the returned memory */
#define MMAP_ALLOC_HEADER_SIZE (sizeof(size_t) >= 16 ? (sizeof(size_t)) : 16)
/* mmap allocator uses chunks of 32 4kB pages */
#define MMAP_ALLOC_CHUNK_SIZE ((32 * 4096) - MMAP_ALLOC_HEADER_SIZE)
#define MMAP_ALLOC_LARGE_OBJECT_SIZE (MMAP_ALLOC_CHUNK_SIZE / 8)
#define MMAP_ALLOC_INITIAL_CLEANUP_SIZE 16
#endif /* USE_MMAP_ALLOC */
/*
* Create a new region.
*/
region_type *region_create(void *(*allocator)(size_t),
void (*deallocator)(void *));
/*
* Create a new region, with chunk size and large object size.
* Note that large_object_size must be <= chunk_size.
* Anything larger than the large object size is individually alloced.
* large_object_size = chunk_size/8 is reasonable;
* initial_cleanup_size is the number of prealloced ptrs for cleanups.
* The cleanups are in a growing array, and it must start larger than zero.
* If recycle is true, environmentally friendly memory recycling is be enabled.
*/
region_type *region_create_custom(void *(*allocator)(size_t),
void (*deallocator)(void *),
size_t chunk_size,
size_t large_object_size,
size_t initial_cleanup_size,
int recycle);
/*
* Destroy REGION. All memory associated with REGION is freed as if
* region_free_all was called.
*/
void region_destroy(region_type *region);
/*
* Add a cleanup to REGION. ACTION will be called with DATA as
* parameter when the region is freed or destroyed.
*
* Returns 0 on failure.
*/
size_t region_add_cleanup(region_type *region,
void (*action)(void *),
void *data);
/*
* Allocate SIZE bytes of memory inside REGION. The memory is
* deallocated when region_free_all is called for this region.
*/
void *region_alloc(region_type *region, size_t size);
/*
* Allocate SIZE bytes of memory inside REGION and copy INIT into it.
* The memory is deallocated when region_free_all is called for this
* region.
*/
void *region_alloc_init(region_type *region, const void *init, size_t size);
/*
* Allocate SIZE bytes of memory inside REGION that are initialized to
* 0. The memory is deallocated when region_free_all is called for
* this region.
*/
void *region_alloc_zero(region_type *region, size_t size);
/*
* Run the cleanup actions and free all memory associated with REGION.
*/
void region_free_all(region_type *region);
/*
* Duplicate STRING and allocate the result in REGION.
*/
char *region_strdup(region_type *region, const char *string);
/*
* Recycle an allocated memory block. Pass size used to alloc it.
* Does nothing if recycling is not enabled for the region.
*/
void region_recycle(region_type *region, void *block, size_t size);
/*
* Print some REGION statistics to OUT.
*/
void region_dump_stats(region_type *region, FILE *out);
/* get size of recyclebin */
size_t region_get_recycle_size(region_type* region);
/* Debug print REGION statistics to LOG. */
void region_log_stats(region_type *region);
#endif /* _REGION_ALLOCATOR_H_ */
|
