Using libpq in a multithreaded environment

Hi,
I need to use libpq in a multithreaded environment.
Ideally I would like to open a single connection to
the database and use that for all threads.
I just discovered that the PGconn returned when a
connection is opened is usable for only one thread
since it also seems to store the result (PGresult *)
and the errorMessage. Could you tell me if there is a
way to use one connection in multiple threads, or
whether I will need to necessarily open one Connection
per thread ? Which is the preferred course of action ?

Thanks,
Rini

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