thread-safe libpq and DBD::Pg

When experimenting with	threaded perl
I noticed I had to lock access to the database
a one user at the time in order get reliable (no SEGV).

Unfortunely it is 3 layer between my server and the wire,
DBI, DBD::Pg och libpq.
Thinking I would start from the bottom:
Has anyone any experience of the thread-safeness of libpq?

	have a good weekend,

		Göran