153 lines
4.4 KiB
C
153 lines
4.4 KiB
C
/**
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* \addtogroup packetqueue
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* @{
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*/
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/*
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* Copyright (c) 2009, Swedish Institute of Computer Science.
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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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* $Id: packetqueue.c,v 1.2 2010/02/28 09:20:32 adamdunkels Exp $
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*/
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/**
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* \file
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* Packet queue management
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/rime/ctimer.h"
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#include "net/rime/packetqueue.h"
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/*---------------------------------------------------------------------------*/
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void
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packetqueue_init(struct packetqueue *q)
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{
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list_init(*q->list);
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memb_init(q->memb);
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}
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/*---------------------------------------------------------------------------*/
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static void
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remove_queued_packet(void *item)
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{
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struct packetqueue_item *i = item;
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struct packetqueue *q = i->queue;
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list_remove(*q->list, i);
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queuebuf_free(i->buf);
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ctimer_stop(&i->lifetimer);
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memb_free(q->memb, i);
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/* printf("removing queued packet due to timeout\n");*/
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}
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/*---------------------------------------------------------------------------*/
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int
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packetqueue_enqueue_packetbuf(struct packetqueue *q, clock_time_t lifetime,
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void *ptr)
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{
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struct packetqueue_item *i;
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/* Allocate a memory block to hold the packet queue item. */
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i = memb_alloc(q->memb);
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if(i == NULL) {
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return 0;
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}
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/* Allocate a queuebuf and copy the contents of the packetbuf into it. */
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i->buf = queuebuf_new_from_packetbuf();
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if(i->buf == NULL) {
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memb_free(q->memb, i);
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return 0;
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}
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i->queue = q;
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i->ptr = ptr;
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/* Setup a ctimer that removes the packet from the queue when its
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lifetime expires. If the lifetime is zero, we do not set a
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lifetimer. */
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if(lifetime > 0) {
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ctimer_set(&i->lifetimer, lifetime, remove_queued_packet, i);
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}
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/* Add the item to the queue. */
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list_add(*q->list, i);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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struct packetqueue_item *
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packetqueue_first(struct packetqueue *q)
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{
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return list_head(*q->list);
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}
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/*---------------------------------------------------------------------------*/
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void
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packetqueue_dequeue(struct packetqueue *q)
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{
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struct packetqueue_item *i;
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i = list_head(*q->list);
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if(i != NULL) {
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list_remove(*q->list, i);
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queuebuf_free(i->buf);
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ctimer_stop(&i->lifetimer);
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memb_free(q->memb, i);
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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packetqueue_len(struct packetqueue *q)
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{
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return list_length(*q->list);
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}
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/*---------------------------------------------------------------------------*/
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struct queuebuf *
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packetqueue_queuebuf(struct packetqueue_item *i)
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{
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if(i != NULL) {
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return i->buf;
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} else {
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return NULL;
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}
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}
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/*---------------------------------------------------------------------------*/
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void *
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packetqueue_ptr(struct packetqueue_item *i)
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{
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if(i != NULL) {
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return i->ptr;
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} else {
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return NULL;
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}
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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