216 lines
6.0 KiB
C
216 lines
6.0 KiB
C
/**
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* \addtogroup rimequeuebuf
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* @{
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*/
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/*
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* Copyright (c) 2006, 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: queuebuf.c,v 1.14 2009/03/12 21:58:21 adamdunkels Exp $
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*/
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/**
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* \file
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* Implementation of the Rime queue buffers
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki-net.h"
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#include <string.h> /* for memcpy() */
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#ifdef QUEUEBUF_CONF_NUM
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#define QUEUEBUF_NUM QUEUEBUF_CONF_NUM
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#else
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#define QUEUEBUF_NUM 4
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#endif
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#ifdef QUEUEBUF_CONF_REF_NUM
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#define QUEUEBUF_REF_NUM QUEUEBUF_CONF_REF_NUM
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#else
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#define QUEUEBUF_REF_NUM 2
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#endif
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struct queuebuf {
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uint16_t len;
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uint8_t data[PACKETBUF_SIZE + PACKETBUF_HDR_SIZE];
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struct packetbuf_attr attrs[PACKETBUF_NUM_ATTRS];
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struct packetbuf_addr addrs[PACKETBUF_NUM_ADDRS];
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};
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struct queuebuf_ref {
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uint16_t len;
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uint8_t *ref;
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uint8_t hdr[PACKETBUF_HDR_SIZE];
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uint8_t hdrlen;
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};
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MEMB(bufmem, struct queuebuf, QUEUEBUF_NUM);
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MEMB(refbufmem, struct queuebuf_ref, QUEUEBUF_REF_NUM);
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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#define QUEUEBUF_STATS 1
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#if QUEUEBUF_STATS
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uint8_t queuebuf_len, queuebuf_ref_len, queuebuf_max_len;
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#endif /* QUEUEBUF_STATS */
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/*---------------------------------------------------------------------------*/
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void
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queuebuf_init(void)
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{
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memb_init(&bufmem);
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memb_init(&refbufmem);
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#if QUEUEBUF_STATS
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queuebuf_max_len = QUEUEBUF_NUM;
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#endif /* QUEUEBUF_STATS */
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}
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/*---------------------------------------------------------------------------*/
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struct queuebuf *
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queuebuf_new_from_packetbuf(void)
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{
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struct queuebuf *buf;
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struct queuebuf_ref *rbuf;
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if(packetbuf_is_reference()) {
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rbuf = memb_alloc(&refbufmem);
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if(rbuf != NULL) {
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#if QUEUEBUF_STATS
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++queuebuf_ref_len;
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#if CONTIKI_TARGET_NETSIM
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/* node_log("%d %d\n",
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queuebuf_len,
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queuebuf_ref_len);*/
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#endif /* CONTIKI_TARGET_NETSIM */
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#endif /* QUEUEBUF_STATS */
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rbuf->len = packetbuf_datalen();
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rbuf->ref = packetbuf_reference_ptr();
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rbuf->hdrlen = packetbuf_copyto_hdr(rbuf->hdr);
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} else {
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PRINTF("queuebuf_new_from_packetbuf: could not allocate a reference queuebuf\n");
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}
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return (struct queuebuf *)rbuf;
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} else {
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buf = memb_alloc(&bufmem);
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if(buf != NULL) {
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#if QUEUEBUF_STATS
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++queuebuf_len;
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if(queuebuf_len == queuebuf_max_len + 1) {
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memb_free(&bufmem, buf);
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queuebuf_len--;
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return NULL;
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}
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#if CONTIKI_TARGET_NETSIM
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/* node_log("%d %d\n",
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queuebuf_len,
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queuebuf_ref_len);*/
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#endif /* CONTIKI_TARGET_NETSIM */
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#endif /* QUEUEBUF_STATS */
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buf->len = packetbuf_copyto(buf->data);
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packetbuf_attr_copyto(buf->attrs, buf->addrs);
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} else {
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PRINTF("queuebuf_new_from_packetbuf: could not allocate a queuebuf\n");
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}
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return buf;
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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queuebuf_free(struct queuebuf *buf)
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{
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if(memb_inmemb(&bufmem, buf)) {
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memb_free(&bufmem, buf);
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#if QUEUEBUF_STATS
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--queuebuf_len;
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#if CONTIKI_TARGET_NETSIM
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/* node_log("%d %d\n",
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queuebuf_len,
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queuebuf_ref_len);*/
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#endif /* CONTIKI_TARGET_NETSIM */
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#endif /* QUEUEBUF_STATS */
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} else if(memb_inmemb(&refbufmem, buf)) {
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memb_free(&refbufmem, buf);
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#if QUEUEBUF_STATS
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--queuebuf_ref_len;
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#if CONTIKI_TARGET_NETSIM
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/* node_log("%d %d\n",
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queuebuf_len,
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queuebuf_ref_len);*/
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#endif /* CONTIKI_TARGET_NETSIM */
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#endif /* QUEUEBUF_STATS */
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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queuebuf_to_packetbuf(struct queuebuf *b)
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{
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struct queuebuf_ref *r;
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if(memb_inmemb(&bufmem, b)) {
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packetbuf_copyfrom(b->data, b->len);
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packetbuf_attr_copyfrom(b->attrs, b->addrs);
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} else if(memb_inmemb(&refbufmem, b)) {
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r = (struct queuebuf_ref *)b;
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packetbuf_clear();
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packetbuf_copyfrom(r->ref, r->len);
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packetbuf_hdralloc(r->hdrlen);
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memcpy(packetbuf_hdrptr(), r->hdr, r->hdrlen);
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}
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}
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/*---------------------------------------------------------------------------*/
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void *
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queuebuf_dataptr(struct queuebuf *b)
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{
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struct queuebuf_ref *r;
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if(memb_inmemb(&bufmem, b)) {
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return b->data;
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} else if(memb_inmemb(&refbufmem, b)) {
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r = (struct queuebuf_ref *)b;
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return r->ref;
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}
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return NULL;
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}
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/*---------------------------------------------------------------------------*/
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int
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queuebuf_datalen(struct queuebuf *b)
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{
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return b->len;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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