On Mar 29, 2007, at 3:59 PM, Salvo Fiduccia wrote:
Ok, I have understood the code that removes the packet from the
list and the following test, but I have originally mentioned the
test inside the first "while" (see the arrow):
void sim_gain_receive_handle(sim_event_t* evt) {
receive_message_t* mine = (receive_message_t*)evt->data;
receive_message_t* predecessor = NULL;
receive_message_t* list = outstandingReceptionHead;
dbg("Gain", "Handling reception event @ %s.\n", sim_time_string
());
while (list != NULL) {
if (list->next == mine) {
predecessor = list;
}
if (list != mine) {
=====> if ((list->power - sim_gain_sensitivity()) < heardSignal()) {
dbg("Gain", "Lost packet from %i as I concurrently received a
packet stronger than %lf\n", list->source, list-
>power);
list->lost = 1;
}
}
list = list->next;
}
.....
This cycle, as you have said, finds the node in the list that
precedes the packet... and (I think) it sets to "1" the "lost"
member of the packets that the node is currently hearing but that
are different from "mine"; i.e. the test (see the arrow) is always
true for the packets "!= mine".
n.b.: I'm interesting in this, because I would modify Tossim to
allow interactions between actual and virtual motes (an augmented
simulator).
Ah! I think you're right. That should be
if ((list->power - sim_gain_sensitivity()) < mine->power) {
Wow, nice catch.
Phil
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