Subject: Re: [linux-audio-user] Re: [Jackit-devel] [Fwd: Re: Linux audio latency]
From: Florian Schmidt (mista.tapas_AT_gmx.net)
Date: Mon Oct 04 2004 - 15:53:15 EEST
On Mon, 4 Oct 2004 14:29:49 +0200
Florian Schmidt <mista.tapas_AT_gmx.net> wrote:
> > Actually, that's not entirely correct. I've been talking to Paul
> > about this. The xruns created by exiting clients is due to jackd
> > having to rework it's internals. When doing this reordering, jackd
> > has to lock the data it's modifying and sometimes (very often) there
> > will be an xrun because the audio thread is waiting for the lock to
> > be released.
> >
>
> Ah, and btw: Shouldn't the audio thread just try the lock and if it
> fails to claim it produce a period of silence? What spot in the code
> is this?
Hmm, it looks like jack is already doing this. See jack_run_one_cycle()
in jackd/engine.c:2351.
if (jack_try_lock_graph (engine)) {
/* engine can't run. just throw away an entire cycle */
driver->null_cycle (driver, nframes);
return 0;
}
maybe there are other places though which just lock and block as
result..
flo
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