On Mar 27, 2007, at 12:15 PM, Bhuvaneswari Ramkumar wrote:
I do want it in a queue but i guess I cant use the ForwardEngine
component
what this one seems to be doing is take pre-determined packets from a
queue and send them in FIFO order
You probably don't want to use this exact component; I just suggested
it as an example of how you can manage a send queue (which is what
you want).
what I want is some function calls to be executed and a send to be
done after every few of them are done , transmitting as a message the
result of the function call itself
so the second send should actually wait for the packet to be filled
with the result of the process say P2 and not as in ForwardEngine
where the packets are there and need to be just queued for sending
bcos funtion call P2 depends on P1 , P3 on P2 ( just the process P2 ,
not its send )
that is these are all dependent processes, taking as its input the
result of the previous process execution( & not its transmission or
reception )
so i dont know if i have a choice other than using multipe send
instances
what I think i should be doing is some thing like this :
event 1
{
process P1
send P1
}
P1.senddone
{
process P2
send p2
}
P2.sendone
{
process P3
send P3
}
and so on sequentially
I'm not sure if i have a choice here
Of course you do. Try this:
taskA {
process P1
put P1 in the queue
post taskB
}
taskB {
process P2
put P2 in the queue
post taskC
}
task C{
process P3
put P3 in the queue
}
put in queue function:
put(m) {
if queue empty
post send task
queue.append(m)
}
sendTask {
m = queue.getNext();
call Send.send(m)
}
sendDone {
if queue not empty
m = queue.getNext()
call Send.send(m)
}
The tasks A, B, and C are so you don't run too long and make TinyOS
unhappy (I have no idea how long your P1, P2, P3 are).
I mean, if you instantiate three senders, then all the AM layer is
doing is allocating three entries in its own send queue... but AM
does not necessarily send packets in the order at which you submit
them, so if you have an ordering requirement just instantiating three
AMSenderC components may cause you trouble.
Phil
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