nes-proj/core/net/rime/packetqueue.c

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