On Mar 22, 2007, at 11:41 AM, Avinash Sridharan wrote:
I apologize for the incomplete mail ..... (hit the sent button by
mistake)
Here is my question:
I am using the forwarding engine from the collection tree frame
work. I had a question on the queue sizes of the client queues and
the forwarding queues.
I checked ctpP.nc and there is variable called QUEUE_SIZE which is
set to CLIENT_COUNT + FORWARD_COUNT, which would be 6.
Does that mean that the queue size for the client and the forwarder
would be 6. I am a bit confused with these variables and would like
to get some advice as to which variables reflect the queue sizes
for the client queue and the forwarder queue.
Ah, yeah, this is a little bit of nesC magic.
Basically, each sending client has a single reserved entry in the
queue. So a client's call to Send.send() returns FAIL iff it already
has a packet pending. CLIENT_COUNT is uniqueCount("...") where the
string is the key used to distinguish clients (I can't recall it off
the top of my head).
In addition to these queue entries, there's a forwarding queue of
size FORWARD_COUNT.
So, for example, if you have no components instantiate a
CollectionSenderC, then the queue size will be FORWARDING_COUNT.
The clients and forwarded packets share a single FIFO queue. CTP just
controls how much of the queue each can use.
Phil
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