blob: a8d7da8187cbb47564f2795306fb170238dcdd5c (
plain)
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
|
/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file chmempools.c
* @brief Memory Pools code.
* @addtogroup pools
* @{
*/
#include <ch.h>
#if CH_USE_MEMPOOLS
/**
* @brief Initializes an empty memory pool.
*
* @param[out] mp pointer to a @p MemoryPool structure
* @param[in] size the size of the objects contained in this memory pool,
* the minimum accepted size is the size of a pointer to void
*/
void chPoolInit(MemoryPool *mp, size_t size) {
chDbgCheck((mp != NULL) && (size >= sizeof(void *)), "chPoolInit");
mp->mp_next = NULL;
mp->mp_object_size = size;
}
/**
* @brief Allocates an object from a memory pool.
*
* @param[in] mp pointer to a @p MemoryPool structure
* @return The pointer to the allocated object.
* @retval NULL if pool is empty.
*/
void *chPoolAllocI(MemoryPool *mp) {
void *objp;
chDbgCheck(mp != NULL, "chPoolAllocI");
if ((objp = mp->mp_next) != NULL)
mp->mp_next = mp->mp_next->ph_next;
return objp;
}
/**
* @brief Allocates an object from a memory pool.
*
* @param[in] mp pointer to a @p MemoryPool structure
* @return The pointer to the allocated object.
* @retval NULL if pool is empty.
*/
void *chPoolAlloc(MemoryPool *mp) {
void *objp;
chSysLock();
objp = chPoolAllocI(mp);
chSysUnlock();
return objp;
}
/**
* @brief Releases (or adds) an object into (to) a memory pool.
*
* @param[in] mp pointer to a @p MemoryPool structure
* @param[in] objp the pointer to the object to be released or added
* @note the object is assumed to be of the right size for the specified
* memory pool.
*/
void chPoolFreeI(MemoryPool *mp, void *objp) {
struct pool_header *php = objp;
chDbgCheck((mp != NULL) && (objp != NULL), "chPoolFreeI");
php->ph_next = mp->mp_next;
mp->mp_next = php;
}
/**
* @brief Releases (or adds) an object into (to) a memory pool.
*
* @param[in] mp pointer to a @p MemoryPool structure
* @param[in] objp the pointer to the object to be released or added
* @note the object is assumed to be of the right size for the specified
* memory pool.
*/
void chPoolFree(MemoryPool *mp, void *objp) {
chSysLock();
chPoolFreeI(mp, objp);
chSysUnlock();
}
#endif /* CH_USE_MEMPOOLS */
/** @} */
|
