10 Nov
2009
10 Nov
'09
3:45 p.m.
On Tue, Nov 10, 2009 at 1:33 PM, <fons(a)kokkinizita.net> wrote:
What I don't see is how e.g. MIDI generators can
use it
in this way to get accurate event timing. Either they are
spinning (evil), or they'd need a system call anyway, and
it that case they should use kernel services instead.
you're confusing two different ways of interacting with the HPET.
as jussi described, the HPET consists of both a free-running timer,
and schedulable timers that cause interrupts. the comments earlier in
thread regarding MIDI scheduling rely on the second part of the HPET,
not the first, and yes, user space would interact with them via normal
system calls like usleep().