172 lines
6.7 KiB
C
172 lines
6.7 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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/* multi_heap is a heap implementation for handling multiple
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heterogenous heaps in a single program.
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Any contiguous block of memory can be registered as a heap.
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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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/** @brief Opaque handle to a registered heap */
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typedef struct multi_heap_info *multi_heap_handle_t;
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/** @brief malloc() a buffer in a given heap
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*
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* Semantics are the same as standard malloc(), only the returned buffer will be allocated in the specified heap.
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*
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* @param heap Handle to a registered heap.
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* @param size Size of desired buffer.
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*
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* @return Pointer to new memory, or NULL if allocation fails.
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*/
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void *multi_heap_malloc(multi_heap_handle_t heap, size_t size);
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/** @brief free() a buffer in a given heap.
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*
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* Semantics are the same as standard free(), only the argument 'p' must be NULL or have been allocated in the specified heap.
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*
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* @param heap Handle to a registered heap.
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* @param p NULL, or a pointer previously returned from multi_heap_malloc() or multi_heap_realloc() for the same heap.
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*/
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void multi_heap_free(multi_heap_handle_t heap, void *p);
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/** @brief realloc() a buffer in a given heap.
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*
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* Semantics are the same as standard realloc(), only the argument 'p' must be NULL or have been allocated in the specified heap.
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*
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* @param heap Handle to a registered heap.
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* @param p NULL, or a pointer previously returned from multi_heap_malloc() or multi_heap_realloc() for the same heap.
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* @param size Desired new size for buffer.
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*
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* @return New buffer of 'size' containing contents of 'p', or NULL if reallocation failed.
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*/
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void *multi_heap_realloc(multi_heap_handle_t heap, void *p, size_t size);
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/** @brief Return the size that a particular pointer was allocated with.
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*
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* @param heap Handle to a registered heap.
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* @param p Pointer, must have been previously returned from multi_heap_malloc() or multi_heap_realloc() for the same heap.
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*
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* @return Size of the memory allocated at this block. May be more than the original size argument, due
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* to padding and minimum block sizes.
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*/
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size_t multi_heap_get_allocated_size(multi_heap_handle_t heap, void *p);
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/** @brief Register a new heap for use
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*
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* This function initialises a heap at the specified address, and returns a handle for future heap operations.
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*
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* There is no equivalent function for deregistering a heap - if all blocks in the heap are free, you can immediately start using the memory for other purposes.
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*
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* @param start Start address of the memory to use for a new heap.
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* @param size Size (in bytes) of the new heap.
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*
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* @return Handle of a new heap ready for use, or NULL if the heap region was too small to be initialised.
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*/
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multi_heap_handle_t multi_heap_register(void *start, size_t size);
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/** @brief Associate a private lock pointer with a heap
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*
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* The lock argument is supplied to the MULTI_HEAP_LOCK() and MULTI_HEAP_UNLOCK() macros, defined in multi_heap_platform.h.
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*
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* The lock in question must be recursive.
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*
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* When the heap is first registered, the associated lock is NULL.
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*
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* @param heap Handle to a registered heap.
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* @param lock Optional pointer to a locking structure to associate with this heap.
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*/
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void multi_heap_set_lock(multi_heap_handle_t heap, void* lock);
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/** @brief Dump heap information to stdout
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*
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* For debugging purposes, this function dumps information about every block in the heap to stdout.
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*
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* @param heap Handle to a registered heap.
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*/
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void multi_heap_dump(multi_heap_handle_t heap);
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/** @brief Check heap integrity
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*
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* Walks the heap and checks all heap data structures are valid. If any errors are detected, an error-specific message
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* can be optionally printed to stderr. Print behaviour can be overriden at compile time by defining
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* MULTI_CHECK_FAIL_PRINTF in multi_heap_platform.h.
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*
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* @param heap Handle to a registered heap.
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* @param print_errors If true, errors will be printed to stderr.
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* @return true if heap is valid, false otherwise.
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*/
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bool multi_heap_check(multi_heap_handle_t heap, bool print_errors);
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/** @brief Return free heap size
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*
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* Returns the number of bytes available in the heap.
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*
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* Equivalent to the total_free_bytes member returned by multi_heap_get_heap_info().
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*
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* Note that the heap may be fragmented, so the actual maximum size for a single malloc() may be lower. To know this
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* size, see the largest_free_block member returned by multi_heap_get_heap_info().
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*
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* @param heap Handle to a registered heap.
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* @return Number of free bytes.
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*/
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size_t multi_heap_free_size(multi_heap_handle_t heap);
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/** @brief Return the lifetime minimum free heap size
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*
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* Equivalent to the minimum_free_bytes member returned by multi_heap_get_info().
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*
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* Returns the lifetime "low water mark" of possible values returned from multi_free_heap_size(), for the specified
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* heap.
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*
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* @param heap Handle to a registered heap.
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* @return Number of free bytes.
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*/
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size_t multi_heap_minimum_free_size(multi_heap_handle_t heap);
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/** @brief Structure to access heap metadata via multi_heap_get_info */
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typedef struct {
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size_t total_free_bytes; ///< Total free bytes in the heap. Equivalent to multi_free_heap_size().
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size_t total_allocated_bytes; ///< Total bytes allocated to data in the heap.
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size_t largest_free_block; ///< Size of largest free block in the heap. This is the largest malloc-able size.
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size_t minimum_free_bytes; ///< Lifetime minimum free heap size. Equivalent to multi_minimum_free_heap_size().
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size_t allocated_blocks; ///< Number of (variable size) blocks allocated in the heap.
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size_t free_blocks; ///< Number of (variable size) free blocks in the heap.
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size_t total_blocks; ///< Total number of (variable size) blocks in the heap.
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size_t total_bytes;
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} multi_heap_info_t;
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/** @brief Return metadata about a given heap
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*
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* Fills a multi_heap_info_t structure with information about the specified heap.
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*
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* @param heap Handle to a registered heap.
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* @param info Pointer to a structure to fill with heap metadata.
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*/
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void multi_heap_get_info(multi_heap_handle_t heap, multi_heap_info_t *info);
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#ifdef __cplusplus
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}
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#endif
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