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New module: packetqueue. The packetqueue module maintains packet queues for other modules.

This commit is contained in:
adamdunkels 2009-04-29 20:47:30 +00:00
parent dbd5f095e4
commit c489b1118d
3 changed files with 357 additions and 1 deletions
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2
core/net/rime/Makefile.rime
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@ -1,6 +1,6 @@
RIME_CHAMELEON = chameleon.c channel.c chameleon-raw.c chameleon-bitopt.c
RIME_BASE = packetbuf.c queuebuf.c rimeaddr.c ctimer.c rime.c timesynch.c \
rimestats.c announcement.c polite-announcement.c
rimestats.c announcement.c polite-announcement.c packetqueue.c
RIME_SINGLEHOP = broadcast.c stbroadcast.c unicast.c stunicast.c \
runicast.c abc.c \
rucb.c polite.c ipolite.c

146
core/net/rime/packetqueue.c Normal file
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/**
* \addtogroup packetqueue
* @{
*/
/*
* 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.
*
* $Id: packetqueue.c,v 1.1 2009/04/29 20:47:30 adamdunkels Exp $
*/
/**
* \file
* Packet queue management
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "net/rime/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);
}
}
/*---------------------------------------------------------------------------*/
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;
}
}
/*---------------------------------------------------------------------------*/
/** @} */

210
core/net/rime/packetqueue.h Normal file
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/**
* \addtogroup rime
* @{
*/
/**
* \defgroup packetqueue Packet queue
* @{
*
* The packetqueue module handles a list of queued packets.
*
*/
/*
* 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.
*
* $Id: packetqueue.h,v 1.1 2009/04/29 20:47:30 adamdunkels Exp $
*/
/**
* \file
* Header file for the packetqueue module
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __PACKETQUEUE_H__
#define __PACKETQUEUE_H__
#include "lib/list.h"
#include "lib/memb.h"
#include "net/rime/packetbuf.h"
#include "net/rime/queuebuf.h"
/**
* \brief Repressentation of a packet queue.
*
* This structure holds the state of a packet queue. It is
* an opaque structure with no user-visible elements.
*/
struct packetqueue {
list_t *list;
struct memb *memb;
};
/**
* \brief Repressentation of an item in a packet queue.
*
* This structure holds the state of a packet queue. It is
* an opaque structure with no user-visible elements. The
* function packetqueue_queuebuf() is used to extract a
* \ref queuebuf "queubuf" from the item. The function
* packetqueue_ptr() is used to extract the opaque pointer
* that was registered with the
* packetqueue_enqueue_packetbuf() function.
*/
struct packetqueue_item {
struct packetqueue_item *next;
struct queuebuf *buf;
struct packetqueue *queue;
struct ctimer lifetimer;
void *ptr;
};
/**
* \brief Define a packet queue.
* \param name The variable name of the packet queue
* \param size The maximum size od the packet queue
*
* This statement defines a packet queue. A packet queue
* is defined on a per-module basis.
*
*/
#define PACKETQUEUE(name, size) LIST(name##_list); \
MEMB(name##_memb, struct packetqueue_item, size); \
static struct packetqueue name = { &name##_list, \
&name##_memb }
/**
* \name Packet queue functions.
* @{
*/
/**
* \brief Initialize a packet queue.
* \param q A pointer to a struct packetqueue that was defined with PACKETQUEUE().
*
* This function initializes a packetqueue that has
* previously been defined with PACKETQUEUE().
*
*/
void packetqueue_init(struct packetqueue *q);
/**
* \brief Enqueue a the packetbuf on a packet queue.
* \param q A pointer to a struct packetqueue.
* \param lifetime The maximum time that the packet should stay in the packet queue, or zero if the packet should stay on the packet queue indefinitely.
* \param ptr An opaque, user-defined pointer that can be used to identify the packet when it later is dequeued.
* \retval Zero If memory could not be allocated for the packet.
* \retval Non-zero If the packet was successfully enqueued.
*
*
* This function enqueues the \ref packetbuf "packetbuf"
* to the packet queue pointed to by the q parameter. The
* packet queue must previously have been defined with
* PACKETQUEUE() and initalized with packetqueue_init().
*
* Each packet queue item has a maximum lifetime. When the
* lifetime expires, the packet queue item is
* automatically removed from the packet queue. If the
* lifetime parameter is given as zero, the packet never
* times out from the packet queue.
*
* Each packet queue item is tagged with a user-defined
* pointer. This pointer can be used to identify packets
* as they later are dequeued from the queue. This is
* useful is two modules is using the same packet queue:
* the modules can use the pointer to distinguish to which
* module a dequeued packet belongs.
*
*/
int packetqueue_enqueue_packetbuf(struct packetqueue *q, clock_time_t lifetime,
void *ptr);
/**
* \brief Access the first item on the packet buffer.
* \param q A pointer to a struct packetqueue.
* \return A pointer to the first item on the packet queue.
*
* This function returns the first item on the packet
* queue. The packet queue is unchanged by this
* function. To dequeue the first item on the list, use
* the packetqueue_dequeue() function.
*
*/
struct packetqueue_item *packetqueue_first(struct packetqueue *q);
/**
* \brief Remove the first item on the packet buffer.
* \param q A pointer to a struct packetqueue.
*
* This function removes the first item on the packet
* queue. The function does not return the first item: to
* access the first item, the packetqueue_first() function
* must have been used prior to calling
* packetqueue_dequeue().
*
*/
void packetqueue_dequeue(struct packetqueue *q);
/**
* @}
*/
/**
* \name Packet queue item functions
* @{
*/
/**
* \brief Access the queuebuf in a packet queue item.
* \param i A packet queue item, obtained with packetqueue_first().
* \return A pointer to the queuebuf in the packet queue item.
*/
struct queuebuf *packetqueue_queuebuf(struct packetqueue_item *i);
/**
* \brief Access the user-defined pointer in a packet queue item.
* \param i A packet queue item, obtained with packetqueue_first().
* \return A pointer to the user-defined pointer in the packet queue item.
*/
void *packetqueue_ptr(struct packetqueue_item *i);
/**
* @}
*/
#endif /* __PACKETQUEUE_H__ */
/** @} */
/** @} */