Subject: Re: [linux-audio-dev] best method for timing
From: Nick D (nixx_AT_nixx.org.uk)
Date: Wed Apr 17 2002 - 14:18:17 EEST
On Tue, 16 Apr 2002 19:08:23 -0400
Paul Davis <pbd_AT_Op.Net> wrote:
> >one remark on the code paul posted: occasionally interrupts can be
> >dropped if a higher priority thread is present on your system
> >(RT audio on a single processor for example); so you cannot just
> >assume time has advanced by 1 / rtc_frequency seconds per poll
> >return.
>
> the assumption in the code i posted is that the RTC is used only to
> provide a tick with reasonable periodicity and adequate
> resolution. the actual "current" time can only be determined by
> looking at the transport system in ardour, since we are talking about
> musical/audio time, not wall clock time.
/dev/rtc also tells us how many interrupts there were since the last read, is this not reliable enough? i assume this value will always be correct?
nick
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