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send immediate probes only if the packet is directed to us.

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sleep for OFF_TIME if the queue is empty.

restrict double packet lifetime timeouts to unicast packets.

stop ctimer in remove_queued_packet in case the function is not called
via the ctimer callback. it could overwrite a valid packet otherwise.
This commit is contained in:
nvt-se 2009-03-31 14:11:25 +00:00
parent c6b15c289e
commit 1d47e2a8da
1 changed files with 25 additions and 16 deletions
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41
core/net/mac/lpp.c
View file

@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: lpp.c,v 1.12 2009/03/31 12:47:00 nvt-se Exp $
* $Id: lpp.c,v 1.13 2009/03/31 14:11:25 nvt-se Exp $
*/
/**
@ -101,7 +101,8 @@ static uint8_t is_listening = 0;
#define LISTEN_TIME CLOCK_SECOND / 32
#define OFF_TIME CLOCK_SECOND * 1
#define PACKET_LIFETIME 2 * (LISTEN_TIME + OFF_TIME)
#define PACKET_LIFETIME (LISTEN_TIME + OFF_TIME)
#define UNICAST_TIMEOUT 2 * PACKET_LIFETIME
struct queue_list_item {
struct queue_list_item *next;
@ -137,7 +138,8 @@ static void
remove_queued_packet(void *item)
{
struct queue_list_item *i = item;
ctimer_stop(&i->timer);
queuebuf_free(i->packet);
list_remove(queued_packets_list, i);
memb_free(&queued_packets_memb, i);
@ -208,8 +210,7 @@ dutycycle(void *ptr)
send_probe();
ctimer_set(t, LISTEN_TIME, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
/* if(queued_packet == NULL) {*/
if(list_length(queued_packets_list) == 0) {
if(is_listening == 0) {
turn_radio_off();
@ -221,10 +222,12 @@ dutycycle(void *ptr)
PT_YIELD(&pt);
} else {
is_listening--;
ctimer_set(t, OFF_TIME,
(void (*)(void *))dutycycle, t);
ctimer_set(t, OFF_TIME, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
}
} else {
ctimer_set(t, OFF_TIME, (void (*)(void *))dutycycle, t);
PT_YIELD(&pt);
}
}
@ -249,6 +252,7 @@ static int
send_packet(void)
{
struct lpp_hdr *hdr;
clock_time_t timeout;
packetbuf_hdralloc(sizeof(struct lpp_hdr));
hdr = packetbuf_hdrptr();
@ -278,8 +282,11 @@ send_packet(void)
return 0;
} else {
list_add(queued_packets_list, i);
ctimer_set(&i->timer, PACKET_LIFETIME, remove_queued_packet, i);
timeout = UNICAST_TIMEOUT;
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_null)) {
timeout = PACKET_LIFETIME;
}
ctimer_set(&i->timer, timeout, remove_queued_packet, i);
/* Wait for a probe packet from a neighbor */
turn_radio_on();
}
@ -357,6 +364,7 @@ read_packet(void)
if it is a data packet. If not, we
should not turn the radio on. */
break;
}
}
}
@ -369,13 +377,14 @@ read_packet(void)
/* XXX send probe after receiving a packet to facilitate data
streaming. We must first copy the contents of the packetbuf into
a queuebuf to avoid overwriting the data with the probe packet. */
struct queuebuf *q;
q = queuebuf_new_from_packetbuf();
if(q != NULL) {
send_probe();
queuebuf_to_packetbuf(q);
queuebuf_free(q);
if(rimeaddr_cmp(&hdr->receiver, &rimeaddr_node_addr)) {
struct queuebuf *q;
q = queuebuf_new_from_packetbuf();
if(q != NULL) {
send_probe();
queuebuf_to_packetbuf(q);
queuebuf_free(q);
}
}
}
len = packetbuf_datalen();