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