Subject: Re: [linux-audio-dev] Plugin APIs (again)
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Wed Dec 11 2002 - 01:05:29 EET
On Tue, Dec 10, 2002 at 10:28:29 +0100, David Olofson wrote:
> > it'd still be interesting to know how the sync problems this
> > method poses are solved: you cannot rely on executable code
> > modifications to be atomic. an indirect jump instruction is
> > not guaranteed to work ok: a pointer on x86 is 32 bits, and
> > atomic is 24 bits (besides, indirect jumps have ill influence
> > on the cache). could do this with branching though -- but you
> > don't want your dsp code interspersed with volatile if()s.
>
> There's no problem if you just wait until no processing is going on
> (this is when you'd normally block on the audio deice), and then
> switch in the new version.
The solution in SyncModular is much simpler, theres a big "Compile" button
and when you press it the sound goes away for a second or so :)
> Obiously, you'll have to remake connections and all that stuff as
> well, but that's no different from non-compiling approaches.
Well, you dont because the connections are part of the code (at the lower
levels at least).
I think this is one of the things that makes it efficient.
- Steve
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