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ac7a4bf44c
Currently we only check timer expiry if there are no client fd (or other input) waiting to be serviced. This makes it very easy to starve the timers with long request queues, and so miss critical timestamps. The timer subsystem is just another input waiting to be serviced, so evaluate it on every loop like all the others, at the cost of calling GetTimeInMillis() slightly more frequently. (A more invasive and likely OS specific alternative would be to move the timer wheel to the local equivalent of timerfd, and treat it as an input fd to the event loop exactly equivalent to all the others, and so also serviced on every pass. The trade-off being that the kernel timer wheel is likely more efficiently integrated with epoll, but individual updates to each timer would then require syscalls.) Reviewed-by: Peter Harris <pharris@opentext.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
https://en.wikipedia.org/wiki/X_server
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https://cgit.freedesktop.org/xorg/xserver
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