PostgreSQL 7.1.3 Documentation
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# 1.10. Threading Behavior

`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.

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