/** * \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. * */ /** * \file * Packet queue management * \author * Adam Dunkels <adam@sics.se> */ #include "sys/ctimer.h" #include "net/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; } } /*---------------------------------------------------------------------------*/ /** @} */