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