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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
|
/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS 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 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 oslib_mempools
* @details Memory Pools related APIs and services.
* <h2>Operation mode</h2>
* The Memory Pools APIs allow to allocate/free fixed size objects in
* <b>constant time</b> and reliably without memory fragmentation
* problems.<br>
* Memory Pools do not enforce any alignment constraint on the
* contained object however the objects must be properly aligned
* to contain a pointer to void.
* @pre In order to use the memory pools APIs the @p CH_CFG_USE_MEMPOOLS option
* must be enabled in @p chconf.h.
* @note Compatible with RT and NIL.
* @{
*/
#include "ch.h"
#if (CH_CFG_USE_MEMPOOLS == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Module exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local types. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Module local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Module exported functions. */
/*===========================================================================*/
/**
* @brief Initializes an empty memory pool.
*
* @param[out] mp pointer to a @p memory_pool_t 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.
* @param[in] align required memory alignment
* @param[in] provider memory provider function for the memory pool or
* @p NULL if the pool is not allowed to grow
* automatically
*
* @init
*/
void chPoolObjectInitAligned(memory_pool_t *mp, size_t size,
unsigned align, memgetfunc_t provider) {
chDbgCheck((mp != NULL) && (size >= sizeof(void *)));
mp->next = NULL;
mp->object_size = size;
mp->align = align;
mp->provider = provider;
}
/**
* @brief Loads a memory pool with an array of static objects.
* @pre The memory pool must already be initialized.
* @pre The array elements must be of the right size for the specified
* memory pool.
* @pre The array elements size must be a multiple of the alignment
* requirement for the pool.
* @post The memory pool contains the elements of the input array.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @param[in] p pointer to the array first element
* @param[in] n number of elements in the array
*
* @api
*/
void chPoolLoadArray(memory_pool_t *mp, void *p, size_t n) {
chDbgCheck((mp != NULL) && (n != 0U));
while (n != 0U) {
chPoolAdd(mp, p);
/*lint -save -e9087 [11.3] Safe cast.*/
p = (void *)(((uint8_t *)p) + mp->object_size);
/*lint -restore*/
n--;
}
}
/**
* @brief Allocates an object from a memory pool.
* @pre The memory pool must already be initialized.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @return The pointer to the allocated object.
* @retval NULL if pool is empty.
*
* @iclass
*/
void *chPoolAllocI(memory_pool_t *mp) {
void *objp;
chDbgCheckClassI();
chDbgCheck(mp != NULL);
objp = mp->next;
/*lint -save -e9013 [15.7] There is no else because it is not needed.*/
if (objp != NULL) {
mp->next = mp->next->next;
}
else if (mp->provider != NULL) {
objp = mp->provider(mp->object_size, mp->align);
}
/*lint -restore*/
return objp;
}
/**
* @brief Allocates an object from a memory pool.
* @pre The memory pool must already be initialized.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @return The pointer to the allocated object.
* @retval NULL if pool is empty.
*
* @api
*/
void *chPoolAlloc(memory_pool_t *mp) {
void *objp;
chSysLock();
objp = chPoolAllocI(mp);
chSysUnlock();
return objp;
}
/**
* @brief Releases an object into a memory pool.
* @pre The memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @iclass
*/
void chPoolFreeI(memory_pool_t *mp, void *objp) {
struct pool_header *php = objp;
chDbgCheckClassI();
chDbgCheck((mp != NULL) && (objp != NULL));
chDbgAssert(((size_t)objp & MEM_ALIGN_MASK(mp->align)) == 0U,
"unaligned object");
php->next = mp->next;
mp->next = php;
}
/**
* @brief Releases an object into a memory pool.
* @pre The memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] mp pointer to a @p memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @api
*/
void chPoolFree(memory_pool_t *mp, void *objp) {
chSysLock();
chPoolFreeI(mp, objp);
chSysUnlock();
}
#if (CH_CFG_USE_SEMAPHORES == TRUE) || defined(__DOXYGEN__)
/**
* @brief Initializes an empty guarded memory pool.
*
* @param[out] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] size the size of the objects contained in this guarded
* memory pool, the minimum accepted size is the size
* of a pointer to void.
* @param[in] align required memory alignment
*
* @init
*/
void chGuardedPoolObjectInitAligned(guarded_memory_pool_t *gmp,
size_t size,
unsigned align) {
chPoolObjectInitAligned(&gmp->pool, size, align, NULL);
chSemObjectInit(&gmp->sem, (cnt_t)0);
}
/**
* @brief Loads a guarded memory pool with an array of static objects.
* @pre The guarded memory pool must already be initialized.
* @pre The array elements must be of the right size for the specified
* guarded memory pool.
* @post The guarded memory pool contains the elements of the input array.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] p pointer to the array first element
* @param[in] n number of elements in the array
*
* @api
*/
void chGuardedPoolLoadArray(guarded_memory_pool_t *gmp, void *p, size_t n) {
chDbgCheck((gmp != NULL) && (n != 0U));
while (n != 0U) {
chGuardedPoolAdd(gmp, p);
/*lint -save -e9087 [11.3] Safe cast.*/
p = (void *)(((uint8_t *)p) + gmp->pool.object_size);
/*lint -restore*/
n--;
}
}
/**
* @brief Allocates an object from a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The pointer to the allocated object.
* @retval NULL if the operation timed out.
*
* @sclass
*/
void *chGuardedPoolAllocTimeoutS(guarded_memory_pool_t *gmp,
sysinterval_t timeout) {
msg_t msg;
msg = chSemWaitTimeoutS(&gmp->sem, timeout);
if (msg != MSG_OK) {
return NULL;
}
return chPoolAllocI(&gmp->pool);
}
/**
* @brief Allocates an object from a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] timeout the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The pointer to the allocated object.
* @retval NULL if the operation timed out.
*
* @api
*/
void *chGuardedPoolAllocTimeout(guarded_memory_pool_t *gmp,
sysinterval_t timeout) {
void *p;
chSysLock();
p = chGuardedPoolAllocTimeoutS(gmp, timeout);
chSysUnlock();
return p;
}
/**
* @brief Releases an object into a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @iclass
*/
void chGuardedPoolFreeI(guarded_memory_pool_t *gmp, void *objp) {
chPoolFreeI(&gmp->pool, objp);
chSemSignalI(&gmp->sem);
}
/**
* @brief Releases an object into a guarded memory pool.
* @pre The guarded memory pool must already be initialized.
* @pre The freed object must be of the right size for the specified
* guarded memory pool.
* @pre The added object must be properly aligned.
*
* @param[in] gmp pointer to a @p guarded_memory_pool_t structure
* @param[in] objp the pointer to the object to be released
*
* @api
*/
void chGuardedPoolFree(guarded_memory_pool_t *gmp, void *objp) {
chSysLock();
chGuardedPoolFreeI(gmp, objp);
chSchRescheduleS();
chSysUnlock();
}
#endif
#endif /* CH_CFG_USE_MEMPOOLS == TRUE */
/** @} */
|
