Merged Model for libpq

Hi All,

I would like to know about the best approach to take for providing a merged
model of libpq library. When I say "merged model" it means that the client
and server would be running as a single process. A single client libpq
application can be linked to either the client-server libpq library or
merged libpq library. For more clarity here is a small flow diagram:

Client Server Model:

Application -> libpq library (cs) -> TCP/IP network -> libpq (backend) ->
pgsql server

Merged Model:

Application -> libpq library (merged) -> pgsql server

One approach that we are having in mind is to use the SPI interface and
re-implement the libpq APIs. Is there any other better approach? Would it
be possible to implement the client server protocol into an API interface,
without involving the TCP/IP network?

Your thoughts and suggestions on this would be highly appreciated.

Rgds,
anna

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