Re: libpq/async notifications

Igor Shevchenko <igor(at)carcass(dot)ath(dot)cx> writes:
> The idea behind this checking function is to separate the *checking* if
> there's any notifications and actually *processing* them. I want to check
> right after any transaction or any PQ* function which calls PQconsumeInput
> and process notifications only once, after my app had returned to it's main
> loop (I'm talking about GUI apps here). In Qt, for example, this is done by
> creating a new QEvent and dispatching it via QApplication::postEvent(...),
> which is quite an overhead; with just PQnotifies I have to do this all the
> time.

How so? Seems to me the check operation could read

notify = PQnotifies(...);
if (notify)
{
make QEvent, put notify pointer in it, dispatch
}

The event handler then fetches the notify pointer from the QEvent
(and eventually frees it).

regards, tom lane