is libpq thread-safe?

A staight forward question:

   Is "libpq" thread-safe??

And an elaboration:

   I want to write a server that opens-up a number of connections
   to a PostgreSQL database, and then spawns threads handing a connection
   object (PGconn) to each thread, so that all the threads can
   perform data-base operations (queries) simultaneously. Each thread will
   use its own connection object. Will this work??

Tanks
npat.