180 lines
6.1 KiB
C
180 lines
6.1 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
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This file is part of ChibiOS.
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ChibiOS 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 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 chheap.h
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* @brief Heaps macros and structures.
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*
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* @addtogroup heaps
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* @{
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*/
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#ifndef CHHEAP_H
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#define CHHEAP_H
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#if (CH_CFG_USE_HEAP == TRUE) || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Module constants. */
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/*===========================================================================*/
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/**
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* @brief Minimum alignment used for heap.
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* @note Cannot use the sizeof operator in this macro.
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*/
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#if (SIZEOF_PTR == 4) || defined(__DOXYGEN__)
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#define CH_HEAP_ALIGNMENT 8U
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#elif (SIZEOF_PTR == 2)
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#define CH_HEAP_ALIGNMENT 4U
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#else
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#error "unsupported pointer size"
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#endif
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/*===========================================================================*/
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/* Module pre-compile time settings. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if CH_CFG_USE_MEMCORE == FALSE
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#error "CH_CFG_USE_HEAP requires CH_CFG_USE_MEMCORE"
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#endif
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#if (CH_CFG_USE_MUTEXES == FALSE) && (CH_CFG_USE_SEMAPHORES == FALSE)
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#error "CH_CFG_USE_HEAP requires CH_CFG_USE_MUTEXES and/or CH_CFG_USE_SEMAPHORES"
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#endif
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/*===========================================================================*/
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/* Module data structures and types. */
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/*===========================================================================*/
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/**
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* @brief Type of a memory heap.
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*/
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typedef struct memory_heap memory_heap_t;
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/**
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* @brief Type of a memory heap header.
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*/
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typedef union heap_header heap_header_t;
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/**
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* @brief Memory heap block header.
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*/
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union heap_header {
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stkalign_t align;
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struct {
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heap_header_t *next; /**< @brief Next block in free list. */
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size_t pages; /**< @brief Size of the area in pages. */
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} free;
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struct {
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memory_heap_t *heap; /**< @brief Block owner heap. */
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size_t size; /**< @brief Size of the area in bytes. */
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} used;
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};
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/**
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* @brief Structure describing a memory heap.
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*/
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struct memory_heap {
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memgetfunc2_t provider; /**< @brief Memory blocks provider for
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this heap. */
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heap_header_t header; /**< @brief Free blocks list header. */
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#if CH_CFG_USE_MUTEXES == TRUE
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mutex_t mtx; /**< @brief Heap access mutex. */
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#else
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semaphore_t sem; /**< @brief Heap access semaphore. */
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#endif
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};
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/*===========================================================================*/
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/* Module macros. */
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/*===========================================================================*/
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/**
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* @brief Allocation of an aligned static heap buffer.
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*/
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#define CH_HEAP_AREA(name, size) \
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ALIGNED_VAR(CH_HEAP_ALIGNMENT) \
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uint8_t name[MEM_ALIGN_NEXT((size), CH_HEAP_ALIGNMENT)]
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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void _heap_init(void);
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void chHeapObjectInit(memory_heap_t *heapp, void *buf, size_t size);
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void *chHeapAllocAligned(memory_heap_t *heapp, size_t size, unsigned align);
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void chHeapFree(void *p);
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size_t chHeapStatus(memory_heap_t *heapp, size_t *totalp, size_t *largestp);
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#ifdef __cplusplus
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}
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#endif
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/*===========================================================================*/
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/* Module inline functions. */
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/*===========================================================================*/
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/**
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* @brief Allocates a block of memory from the heap by using the first-fit
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* algorithm.
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* @details The allocated block is guaranteed to be properly aligned for a
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* pointer data type.
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*
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* @param[in] heapp pointer to a heap descriptor or @p NULL in order to
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* access the default heap.
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* @param[in] size the size of the block to be allocated. Note that the
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* allocated block may be a bit bigger than the requested
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* size for alignment and fragmentation reasons.
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* @return A pointer to the allocated block.
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* @retval NULL if the block cannot be allocated.
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*
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* @api
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*/
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static inline void *chHeapAlloc(memory_heap_t *heapp, size_t size) {
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return chHeapAllocAligned(heapp, size, CH_HEAP_ALIGNMENT);
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}
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/**
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* @brief Returns the size of an allocated block.
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* @note The returned value is the requested size, the real size is the
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* same value aligned to the next @p CH_HEAP_ALIGNMENT multiple.
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*
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* @param[in] p pointer to the memory block
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* @return Size of the block.
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*
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* @api
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*/
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static inline size_t chHeapGetSize(const void *p) {
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return ((heap_header_t *)p)->used.size;
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}
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#endif /* CH_CFG_USE_HEAP == TRUE */
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#endif /* CHHEAP_H */
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/** @} */
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