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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef APR_ALLOCATOR_H
#define APR_ALLOCATOR_H
/**
* @file apr_allocator.h
* @brief APR Internal Memory Allocation
*/
#include "apr.h"
#include "apr_errno.h"
#define APR_WANT_MEMFUNC /**< For no good reason? */
#include "apr_want.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup apr_allocator Internal Memory Allocation
* @ingroup APR
* @{
*/
/** the allocator structure */
typedef struct apr_allocator_t apr_allocator_t;
/** the structure which holds information about the allocation */
typedef struct apr_memnode_t apr_memnode_t;
/** basic memory node structure
* @note The next, ref and first_avail fields are available for use by the
* caller of apr_allocator_alloc(), the remaining fields are read-only.
* The next field has to be used with caution and sensibly set when the
* memnode is passed back to apr_allocator_free(). See apr_allocator_free()
* for details.
* The ref and first_avail fields will be properly restored by
* apr_allocator_free().
*/
struct apr_memnode_t {
apr_memnode_t *next; /**< next memnode */
apr_memnode_t **ref; /**< reference to self */
apr_uint32_t index; /**< size */
apr_uint32_t free_index; /**< how much free */
char *first_avail; /**< pointer to first free memory */
char *endp; /**< pointer to end of free memory */
};
/** The base size of a memory node - aligned. */
#define APR_MEMNODE_T_SIZE APR_ALIGN_DEFAULT(sizeof(apr_memnode_t))
/** Symbolic constants */
#define APR_ALLOCATOR_MAX_FREE_UNLIMITED 0
/**
* Create a new allocator
* @param allocator The allocator we have just created.
*
*/
APR_DECLARE(apr_status_t) apr_allocator_create(apr_allocator_t **allocator)
__attribute__((nonnull(1)));
/**
* Destroy an allocator
* @param allocator The allocator to be destroyed
* @remark Any memnodes not given back to the allocator prior to destroying
* will _not_ be free()d.
*/
APR_DECLARE(void) apr_allocator_destroy(apr_allocator_t *allocator)
__attribute__((nonnull(1)));
/**
* Allocate a block of mem from the allocator
* @param allocator The allocator to allocate from
* @param size The size of the mem to allocate (excluding the
* memnode structure)
*/
APR_DECLARE(apr_memnode_t *) apr_allocator_alloc(apr_allocator_t *allocator,
apr_size_t size)
__attribute__((nonnull(1)));
/**
* Free a list of blocks of mem, giving them back to the allocator.
* The list is typically terminated by a memnode with its next field
* set to NULL.
* @param allocator The allocator to give the mem back to
* @param memnode The memory node to return
*/
APR_DECLARE(void) apr_allocator_free(apr_allocator_t *allocator,
apr_memnode_t *memnode)
__attribute__((nonnull(1,2)));
/**
* Get the true size that would be allocated for the given size (including
* the header and alignment).
* @param allocator The allocator from which to the memory would be allocated
* @param size The size to align
* @return The aligned size (or zero on apr_size_t overflow)
*/
APR_DECLARE(apr_size_t) apr_allocator_align(apr_allocator_t *allocator,
apr_size_t size);
#include "apr_pools.h"
/**
* Set the owner of the allocator
* @param allocator The allocator to set the owner for
* @param pool The pool that is to own the allocator
* @remark Typically pool is the highest level pool using the allocator
*/
/*
* XXX: see if we can come up with something a bit better. Currently
* you can make a pool an owner, but if the pool doesn't use the allocator
* the allocator will never be destroyed.
*/
APR_DECLARE(void) apr_allocator_owner_set(apr_allocator_t *allocator,
apr_pool_t *pool)
__attribute__((nonnull(1)));
/**
* Get the current owner of the allocator
* @param allocator The allocator to get the owner from
*/
APR_DECLARE(apr_pool_t *) apr_allocator_owner_get(apr_allocator_t *allocator)
__attribute__((nonnull(1)));
/**
* Set the current threshold at which the allocator should start
* giving blocks back to the system.
* @param allocator The allocator to set the threshold on
* @param size The threshold. 0 == unlimited.
*/
APR_DECLARE(void) apr_allocator_max_free_set(apr_allocator_t *allocator,
apr_size_t size)
__attribute__((nonnull(1)));
#include "apr_thread_mutex.h"
#if APR_HAS_THREADS
/**
* Set a mutex for the allocator to use
* @param allocator The allocator to set the mutex for
* @param mutex The mutex
*/
APR_DECLARE(void) apr_allocator_mutex_set(apr_allocator_t *allocator,
apr_thread_mutex_t *mutex)
__attribute__((nonnull(1)));
/**
* Get the mutex currently set for the allocator
* @param allocator The allocator
*/
APR_DECLARE(apr_thread_mutex_t *) apr_allocator_mutex_get(
apr_allocator_t *allocator)
__attribute__((nonnull(1)));
#endif /* APR_HAS_THREADS */
/** @} */
#ifdef __cplusplus
}
#endif
#endif /* !APR_ALLOCATOR_H */
|
