Task design considerations for a multilayer protocol stack

Hi,

If I need to design a system using Vxworks tasks with multiple
applications talking to a middle abstract layer with a drivers below
the middle one, how do I decide if I need a single task or multiple
tasks at the middle layer. Let us say there are 3 apllications app1,
app2,app3 which need to communicate with a middle layer in both
directions(send/recv information). The middle layer in turn interacts
with a lower layer with 2 drivers(again send/recv).
How many tasks would be needed in middle layer and what IPC mechanism
would they use and how many.
For example will each application use 2 queues (one for each
direction) or just a single queue.
I would also like to know on what basis would I determine the number
of tasks required in a system. Is there any guidleline for identifying
what/how much should be done in a single task and when we should go
for multiple tasks.

Please explain.

Thanks,
asm

.

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