161 lines
5.9 KiB
C
161 lines
5.9 KiB
C
/*
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* Copyright (c) 2019 - 2021, Nordic Semiconductor ASA
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/**
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* @brief Module implementing simple FIFO queue.
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*/
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#ifndef NRF_802154_QUEUE_H__
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#define NRF_802154_QUEUE_H__
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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/**@brief Type representing a FIFO queue. */
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typedef struct
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{
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/**@brief Pointer to items memory of the queue.
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* @details Memory pointed by this pointer has size @c item_size * @c capacity. */
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void * p_memory;
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/**@brief Size of an item in the queue. */
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uint8_t item_size;
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/**@brief Maximum number of items that can be stored in the memory of the queue */
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uint8_t capacity;
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/**@brief Index in the items memory of the queue where next item is written. */
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volatile uint8_t wridx;
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/**@brief Index in the items memory of the queue where next item is read. */
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volatile uint8_t rdidx;
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} nrf_802154_queue_t;
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/**@brief Initializes a queue.
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*
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* @param[in] p_queue Pointer to the queue instance to be initialized. Must not be NULL.
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* @param[in] p_memory Pointer to a memory that will be used to store items of the queue.
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* Must not be NULL.
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* @param[in] memory_size Size of the memory pointed by @p p_memory.
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* This parameter must be no less than 2 * @p item_size
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* @param[in] item_size Size of an item of the queue. Must not be 0.
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*/
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void nrf_802154_queue_init(nrf_802154_queue_t * p_queue,
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void * p_memory,
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size_t memory_size,
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size_t item_size);
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/**@brief Returns pointer to the next item to be written to the queue.
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*
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* This function is to be used when writing data to the queue directly (no copy).
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* Returned pointer is valid when the queue is not full (@ref nrf_802154_queue_is_full returned false).
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* To write an item to the queue perform following.
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* @code
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* if (!nrf_802154_queue_is_full(&queue))
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* {
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* my_item_t * p_item = (my_item_t *)nrf_802154_queue_push_begin(&queue);
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* ... p_item is now direct pointer into memory of the queue, fill all data at p_item pointer
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* p_item->some_field = some_value;
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* ... fill all data at p_item pointer
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* nrf_802154_queue_push_commit(&queue)
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* }
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* @endcode
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*
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* To ensure thread-safety external locking is required.
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*
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* @param[in] p_queue Pointer to the queue instance.
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*
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* @return Pointer to the next item to be written.
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*/
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void * nrf_802154_queue_push_begin(const nrf_802154_queue_t * p_queue);
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/**@brief Increments write pointer of the queue.
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*
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* @param[in] p_queue Pointer to the queue instance.
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*/
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void nrf_802154_queue_push_commit(nrf_802154_queue_t * p_queue);
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/**@brief Returns pointer to the next item to be read from the queue.
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*
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* This function is to be used when reading data from the queue directly (no copy).
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* Returned pointer is valid when the queue is not empty (@ref nrf_802154_queue_is_empty returned false).
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* To ensure thread-safety external locking is required.
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*
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* To read an item from the queue perform following.
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* @code
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* if (!nrf_802154_queue_is_empty(&queue))
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* {
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* my_item_t * p_item = (my_item_t *)nrf_802154_queue_pop_begin(&queue);
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* ... read & process data pointed by p_item
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* nrf_802154_queue_pop_commit(&queue)
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* }
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* @endcode
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*
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*
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* @param[in] p_queue Pointer to the queue instance.
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*
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* @return Pointer to the next item to be written.
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*/
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void * nrf_802154_queue_pop_begin(const nrf_802154_queue_t * p_queue);
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/**@brief Increments read pointer of the queue.
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*
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* @param[in] p_queue Pointer to the queue instance.
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*/
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void nrf_802154_queue_pop_commit(nrf_802154_queue_t * p_queue);
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/**@brief Checks if the queue is empty.
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*
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* @param[in] p_queue Pointer to the queue instance.
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*
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* @retval true When the queue is empty
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* @retval false When the queue is not empty.
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*/
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static inline bool nrf_802154_queue_is_empty(const nrf_802154_queue_t * p_queue)
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{
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return (p_queue->wridx == p_queue->rdidx);
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}
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/**@brief Checks if the queue is full.
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*
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* @param[in] p_queue Pointer to the queue instance.
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*
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* @retval true When the queue is full.
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* @retval false When the queue is not full.
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*/
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bool nrf_802154_queue_is_full(const nrf_802154_queue_t * p_queue);
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#endif /* NRF_802154_QUEUE_H__ */
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