On 2017-04-22 09:14:50 +0800, Craig Ringer wrote: > 2) if the answer to the previous question is negative, is it possible to > send asynchronous queries in one thread while reading results in another > thread? > > > Not right now. libpq's state tracking wouldn't cope. > > I imagine it could be modified to work with some significant refactoring. > You'd need to track state with a shared fifo of some kind where dispatch > outs queries on the fifo as it sends them and receive pops them from it.
FWIW, I think it'd be a *SERIOUSLY* bad idea trying to make individual PGconn interactions threadsafe. It'd imply significant overhead in a lot of situations, and programming it would have to become a lot more complicated (since you need to synchronize command submission between threads). For almost all cases it's better to either use multiple connections or use a coarse grained mutex around all of libpq. - Andres -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
