10 Nov
2009
10 Nov
'09
5:01 p.m.
On Tue, Nov 10, 2009 at 09:34:28PM +0200, Jussi Laako wrote:
fons(a)kokkinizita.net wrote:
All perfectly logical. But what then is stopping the driver devs
from providing just read access to the main counter ? Who could
object to read-only access to a device register (if reading it
has no side effects) ?
Ciao,
--
FA
Io lo dico sempre: l'Italia è troppo stretta e lunga.
So you're just reading it, not waiting on it
? That indeed
should be 'free'.
Yes, we just need to read it. JACK used to use TSC for that, and HPET
support was introduced as similar low-cost alternative to deal with
variable clock frequencies (important on mobile things) and unsynced
TSC. Use of syscalls is kind of fallback.
Audio hardware (interrupts) act as a waitable time source.