2013/6/5 Giovanni Mascellani <g(dot)mascellani(at)gmail(dot)com>
> Hi.
>
> At the moment libpq doesn't seem to support asynchronous and
> non-blocking support for large objects, in the style of
> PQsendQuery/PQgetResult. This makes large objects hardly suited for
> single-threaded programs based on some variant of select().
>
According to http://www.postgresql.org/docs/9.2/static/lo-funcs.html
"There are server-side functions callable from SQL that correspond to each
of
the client-side functions". Hence, you can call these functions by using
asynchronous API.
--
// Dmitriy.