120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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* Copyright (c) 2015, SICS Swedish ICT.
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* All rights reserved.
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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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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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* 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 INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Header file for the ringbufindex library
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* \author
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* Simon Duquennoy <simonduq@sics.se>
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*/
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#ifndef __RINGBUFINDEX_H__
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#define __RINGBUFINDEX_H__
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#include "contiki-conf.h"
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struct ringbufindex {
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uint8_t mask;
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/* These must be 8-bit quantities to avoid race conditions. */
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uint8_t put_ptr, get_ptr;
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};
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/**
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* \brief Initialize a ring buffer. The size must be a power of two
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* \param r Pointer to ringbufindex
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* \param size Size of ring buffer
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*/
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void ringbufindex_init(struct ringbufindex *r, uint8_t size);
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/**
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* \brief Put one element to the ring buffer
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* \param r Pointer to ringbufindex
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* \retval 0 Failure; the ring buffer is full
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* \retval 1 Success; an element is added
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*/
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int ringbufindex_put(struct ringbufindex *r);
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/**
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* \brief Check if there is space to put an element.
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* \param r Pinter to ringbufindex
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* \retval >= 0 The index where the next element is to be added.
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* \retval -1 Failure; the ring buffer is full
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*/
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int ringbufindex_peek_put(const struct ringbufindex *r);
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/**
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* \brief Remove the first element and return its index
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* \param r Pinter to ringbufindex
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* \retval >= 0 The index of the first element
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* \retval -1 No element in the ring buffer
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*/
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int ringbufindex_get(struct ringbufindex *r);
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/**
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* \brief Return the index of the first element which will be removed if calling
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* ringbufindex_get.
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* \param r Pinter to ringbufindex
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* \retval >= 0 The index of the first element
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* \retval -1 No element in the ring buffer
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*/
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int ringbufindex_peek_get(const struct ringbufindex *r);
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/**
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* \brief Return the ring buffer size
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* \param r Pinter to ringbufindex
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* \return The size of the ring buffer
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*/
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int ringbufindex_size(const struct ringbufindex *r);
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/**
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* \brief Return the number of elements currently in the ring buffer.
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* \param r Pinter to ringbufindex
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* \return The number of elements in the ring buffer
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*/
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int ringbufindex_elements(const struct ringbufindex *r);
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/**
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* \brief Is the ring buffer full?
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* \retval 0 Not full
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* \retval 1 Full
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*/
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int ringbufindex_full(const struct ringbufindex *r);
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/**
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* \brief Is the ring buffer empty?
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* \retval 0 Not empty
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* \retval 1 Empty
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*/
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int ringbufindex_empty(const struct ringbufindex *r);
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#endif /* __RINGBUFINDEX_H__ */
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