[Xcb] knowing when the X server will send the reply

Barton C Massey bart at cs.pdx.edu
Mon Jan 28 14:21:42 PST 2008

In message <Pine.LNX.4.64.0801282304020.21427 at grozny.maths.univ-evry.fr> you wrote:
> > If you're very careful, you can do that with
> > select(2) or poll(2) on the file descriptor of the socket connected to
> > the X server, but there are subtle traps there too.
> raster already does that stuff for X events and xcb_poll_for_event (well, 
> i wrote that xcb part, actually). We indeed do a select on the fd. If you 
> want to look ath the code :
> http://web.enlightenment.org/viewvc/e17/libs/ecore/src/lib/ecore_x/ecore_x.c?annotate=1.130
> (lines 389, 646 and 671)
> and
> http://web.enlightenment.org/viewvc/e17/libs/ecore/src/lib/ecore/ecore_main.c?annotate=1.33
> (lines 107 and 284)
> thanks for the reply

As Jamey said, be careful.  XCB is already being pretty
clever about using select on the connection fd for its own
purposes; watch out for races!


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