95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/**
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* @file send_queue.h
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*
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* @brief Send-Queue based on linked_list_t
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#ifndef SEND_QUEUE_H_
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#define SEND_QUEUE_H_
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#include "types.h"
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#include "packet.h"
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/**
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* @brief Send-Queue
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*
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* Although the send-queue is based on a linked_list_t
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* all access functions are thread-save implemented
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*/
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typedef struct send_queue_s send_queue_t;
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struct send_queue_s {
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/**
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* @brief returns number of packets in queue
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*
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* @param send_queue_t calling object
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* @param[out] count integer pointer to store the count in
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* @returns number of items in queue
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*/
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int (*get_count) (send_queue_t *send_queue);
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/**
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* @brief get the next packet from the queue
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*
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* If the queue is empty, this function blocks until a packet can be returned.
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*
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* After using, the returned packet has to get destroyed by the caller.
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*
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* @param send_queue_t calling object
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* @param[out] packet pointer to a packet_t pointer where to packet is returned to
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* @returns SUCCESS if succeeded, FAILED otherwise
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*/
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status_t (*get) (send_queue_t *send_queue, packet_t **packet);
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/**
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* @brief adds a packet to the queue
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*
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* This function is non blocking and adds a packet_t to the list.
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* The specific packet object has to get destroyed by the thread which
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* removes the packet.
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*
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* @param send_queue_t calling object
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* @param[in] packet packet_t to add to the queue (packet is not copied)
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* @returns SUCCESS if succeeded, FAILED otherwise
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*/
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status_t (*add) (send_queue_t *send_queue, packet_t *packet);
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/**
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* @brief destroys a send_queue object
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*
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* @warning The caller of this function has to make sure
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* that no thread is going to add or get a packet from the send_queue
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* after calling this function.
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*
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* @param send_queue_t calling object
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* @returns SUCCESS if succeeded, FAILED otherwise
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*/
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status_t (*destroy) (send_queue_t *send_queue);
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};
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/**
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* @brief Creates an empty send_queue_t
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*
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* @return send_queue_t empty send_queue_t
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*/
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send_queue_t *send_queue_create();
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#endif /*SEND_QUEUE_H_*/
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