Thank you, Nick. Is it possible to achieve immediate action by using pipes ? Are they supported ?
On 13 Jan 2014, at 08:43, Nick Mathewson <ni...@freehaven.net> wrote: > On Fri, Jan 10, 2014 at 4:24 PM, Александр Смирнов <alexan...@smirn0v.ru> > wrote: >> Greetings! >> >> Thanks in advance for any help you are able to provide! I'm on my very start >> with libevent. >> >> As far as I understand libevent will instantly notify me about any event on >> file descriptor. >> >> But what with events which has no file descriptor (fd = -1) ? >> >> Do I understand right that in blocking mode event_base_loop() will block >> only on real events (based on existing fds) ? So event_active() will not >> have any effect until some real event triggered ? >> >> What I've managed to find out by myself: >> * event_active() does nothing beside placing event on queue to process. so >> it not assumes "immediate" action. >> * event_add calls evmap_io_add which does nothing in case of fd<0 >> >> So there is no way to get immediate response for fd=-1 events ? > > fd==-1 is used in libevent to indicate an event that has no fd -- > either because it is a timer-only event, or because it's used only > with event_active(). It should not have EV_READ or EV_WRITE set. > > In general, libevent doesn't have a good notion of "run immediately" > -- the closest that it has is "run this event as part of processing > active events" -- which causes the event to get invoked right away if > the event loop is running, but not otherwise. > *********************************************************************** > To unsubscribe, send an e-mail to majord...@freehaven.net with > unsubscribe libevent-users in the body. *********************************************************************** To unsubscribe, send an e-mail to majord...@freehaven.net with unsubscribe libevent-users in the body.
