Re: libpq thread safety

Mark Morgan Lloyd <markMLl(dot)pgsql-general(at)telemetry(dot)co(dot)uk> writes:
> Do any special precautions need to be taken when PQNotifies is being
> called, to make sure that nothing else is referencing the handle?

It's pretty much the same as any other operation on a PGconn: if there
could be more than one thread touching the connection object
concurrently, you'd be well advised to add some application-level
locking.

http://www.postgresql.org/docs/9.2/static/libpq-threading.html

The lack of any such locking inside libpq is partly historical, and
partly because in many practical situations you'll need application-side
locks anyway to protect application data structures associated with the
connection.

regards, tom lane