[Opensim-users] A theoretical question ... about communication guarantees between objects in LSL

[Dr Ramesh Ramloll]

I agree Simon, introducing a count is a simple solution. Just thinking
aloud here, even if the count info is lost, does not matter... if a
'message send' is executed only if a count info is received, that would
cover all bases


On Mon, Nov 12, 2012 at 9:19 AM, Slavin, Simon <s.slavin at lancaster.ac.uk>wrote:

>
> On 12 Nov 2012, at 1:57pm, Dr Ramesh Ramloll wrote:
>
> > I was wondering if I could get some ideas from the technical wonks out
> there. Here's my problem (not the real one..but I simplified it a bit to
> keep things brief). Everything implemented in LSL of course. I have two
> objects A and B, A sends messages to B.  I found that there are no
> guarantees that B will ALWAYS receive a message sent by A. I would expect
> the messages to be queued up, but seems that there is a black hole
> somewhere. Anyway, so, I then need to think about 'Acknowledgement system'
> that would cause A to resend if B does not receive it (within a set waiting
> period...). So this means that I need to put A in a sending loop until B
> sends an acknowledgment back to A.
> > OR.. I could just send messages from A to B, twice every time... just to
> reduce changes of a message not received. Should I go for the easy way ...
> or is there really a bigger advantage for trying to implement guarantees
> in.  Your thoughts?
>
> B keeps a count of how many messages it has received.  It provides a way
> of asking for its current count.
>
> A asks B for its count.  A sends its message and waits a second.  A asks B
> for its count again.  If the two counts match, the message was not received.
>
> Simon.
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