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/*
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/>.
*/
/**
* @addtogroup MemoryPools
* @{
*/
#include <ch.h>
#ifdef CH_USE_MEMPOOLS
/**
* Initializes an empty memory pool.
* @param mp pointer to a \p MemoryPool structure
* @param size the size of the objects contained in this memory pool
*/
void chPoolInit(MemoryPool *mp, size_t size) {
chDbgAssert((mp != NULL) && (size >= sizeof(void *)),
"chpools.c, chPoolFree()");
mp->mp_next = NULL;
mp->mp_object_size = size;
}
/**
* Allocates an object from a memory pool.
* @param 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;
chDbgAssert(mp != NULL, "chmempools.c, chPoolAllocI()");
if ((objp = mp->mp_next) != NULL)
mp->mp_next = mp->mp_next->ph_next;
return objp;
}
/**
* Allocates an object from a memory pool.
* @param 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;
}
/**
* Releases (or adds) an object into (to) a memory pool.
* @param mp pointer to a \p MemoryPool structure
* @param 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;
chDbgAssert((mp != NULL) && (objp != NULL),
"chmempools.c, chPoolFreeI()");
php->ph_next = mp->mp_next;
mp->mp_next = php;
}
/**
* Releases (or adds) an object into (to) a memory pool.
* @param mp pointer to a \p MemoryPool structure
* @param 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 */
/** @} */
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