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libpq is thread-safe as of
Postgres 7.0, so long as no two threads
attempt to manipulate the same PGconn object at the same time. In particular,
you can't issue concurrent queries from different threads through the same
connection object. (If you need to run concurrent queries, start up multiple
connections.)
PGresult objects are read-only after creation, and so can be passed around
freely between threads.
The deprecated functions PQoidStatus and
fe_setauthsvc are not thread-safe and should not be
used in multi-thread programs. PQoidStatus can be
replaced by PQoidValue. There is no good reason to
call fe_setauthsvc at all.
