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140 lines
5.7 KiB
C
140 lines
5.7 KiB
C
/* Copyright (c) 2014 Nordic Semiconductor. All Rights Reserved.
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*
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* The information contained herein is property of Nordic Semiconductor ASA.
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* Terms and conditions of usage are described in detail in NORDIC
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* SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
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*
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* Licensees are granted free, non-transferable use of the information. NO
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* WARRANTY of ANY KIND is provided. This heading must NOT be removed from
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* the file.
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*
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*/
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/** @file
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*
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* @defgroup mem_manager Memory Manager
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* @{
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* @ingroup app_common
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* @brief Memory Manager for the \nRFXX SDK
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*
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* @details This module allows for dynamic use of memory. Currently,
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* this module can be used only to allocate and free memory in the RAM.
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*
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* The Memory Manager manages static memory blocks of fixed sizes. These blocks can be requested for
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* usage, and freed when the application no longer needs them. A maximum of seven block categories
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* can be managed by the module. These block categories are identified by xxsmall, xmall, small,
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* medium, large, xlarge, and xxlarge. They are ordered in increasing block sizes.
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* The size and the count of each of the block categories can be configured based on the application
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* requirements in the configuration file @c sdk_config.h.
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* To use fewer than seven buffer pools, do not define the count for the unwanted block
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* or explicitly set it to zero. At least one block category must be configured
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* for this module to function as expected.
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*/
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#ifndef MEM_MANAGER_H__
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#define MEM_MANAGER_H__
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#include "sdk_common.h"
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/**@brief Initializes Memory Manager.
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*
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* @details API to initialize the Memory Manager. Always call this API before using any of the other
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* APIs of the module. This API should be called only once.
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*
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* @retval NRF_SUCCESS If initialization was successful.
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* Otherwise, an error code that indicates the reason for the failure is returned.
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*
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* @warning If this API fails, the application shall not proceed with using other APIs of this
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* module.
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*/
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uint32_t nrf_mem_init(void);
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/**@brief Reserves a block of memory for the application.
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*
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* @details API to request a contiguous memory block of the given length. If
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* the memory allocation succeeds, pp_buffer points to the memory block. If
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* the memory allocation fails, pp_buffer points to NULL and the return value of
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* the API indicates the reason for the failure. The memory block reserved using this API can
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* be freed using the @ref nrf_free function.
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*
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* @param[out] pp_buffer Pointer to the allocated memory block if memory allocation
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* succeeds; otherwise points to NULL.
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* @param[inout] p_size Requested memory size. This parameter returns the actual size
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* allocated. If the procedure was successful, the actual size
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* returned is always greater than or equal to requested size,
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* never less.
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*
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* @retval NRF_SUCCESS If memory was successfully allocated.
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* Otherwise, an error code indicating the reason for failure.
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* @retval NRF_ERROR_INVALID_PARAM If the requested memory size is zero or greater than the
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* largest memory block that the module is configured to
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* support.
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* @retval NRF_ERROR_NO_MEM If there is no memory available of the requested size.
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*/
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uint32_t nrf_mem_reserve(uint8_t ** pp_buffer, uint32_t * p_size);
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/**@brief 'malloc' styled memory allocation function.
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*
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* @details API to allocate memory, same as nrf_mem_reserve but uses malloc signature.
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*
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* @param[in] size Requested memory size.
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*
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* @retval Valid memory location if the procedure was successful, else, NULL.
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*/
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void * nrf_malloc(uint32_t size);
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/**@brief 'calloc' styled memory allocation function.
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*
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* @details API to allocate zero-initialized memory of size count*size.
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*
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* @param[in] nmemb Number of elements of 'size' bytes.
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* @param[in] size Size of each element allocated.
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*
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* @retval Valid, zero-initialized memory location if the procedure was successful, else, NULL.
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*/
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void * nrf_calloc(uint32_t nmemb, uint32_t size);
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/**@brief Free allocated memory - standard 'free' styles API.
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*
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* @details API to resubmit memory allocated, same in functionality nrf_free.
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*
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* @param[out] p_buffer Pointer to the memory block that is being freed.
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*/
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void nrf_free(void * p_buffer);
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/**@brief Memory reallocation (trim) function.
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*
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* @details API to reallocate memory or to trim it. Trim is mentioned here to avoid use of API to
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* request memory size larger than original memory allocated.
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*
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* @param[in] p_buffer Pointer to the memory block that needs to be trimmed.
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* @param[in] size Size of memory at the beginning of the buffer to be left untrimmed.
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*
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* @retval Pointer to memory location with trimmed size, else, NULL.
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*/
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void * nrf_realloc(void *p_buffer, uint32_t size);
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#ifdef MEM_MANAGER_ENABLE_DIAGNOSTICS
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/**@brief Function to print statstics related to memory blocks managed by memory manager.
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*
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* @details This API prints information with respects to each block function, including size, total
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* block count, number of blocks in use at the time of printing, smallest memory size
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* allocated in the block and the largest one. This API is intended to help developers
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* tune the block sizes to make optimal use of memory for the application.
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* This functionality is never needed in final application and therefore, is disabled by
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* default.
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*/
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void nrf_mem_diagnose(void);
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#endif // MEM_MANAGER_ENABLE_DIAGNOSTICS
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#endif // MEM_MANAGER_H__
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/** @} */
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