waiting without polling

[Philippe Ribet <p ribet worldonline fr>]

Hello,

I looked at gdk_event_prepare, gdk_event_check, gdk_event_dispatch but I
can't see where program is waiting. I mean, if you call gtk_main(), the
program is waiting for events, run timeouts sources, but do not poll
(heavilly loading processor if looking if there is something to do).
Does g_main_iterate do this "waiting", was a source added with very
short timeout (I found none), or it has to do with poll_arrays (where to
see that in code) ?

Hope my english is understandable,

        Thanks for helping me to understand this internal events loop.

                    Philippe Ribet