Re: [linux-audio-dev] questions to be resolved

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Subject: Re: [linux-audio-dev] questions to be resolved
From: Abramo Bagnara (abramo_AT_alsa-project.org)
Date: Mon May 21 2001 - 21:04:33 EEST

Abramo Bagnara wrote:
>
> readers and writer share the same memory that contains a copy of the
> object and two integer: begin and end.
>
> writers:
> pthread_mutex_lock
> begin++
> wmb()
> write to the area
> wmb()
> end++
> pthread_mutex_unlock
>
> reader:
> if (cookie != end) {
> cookie = end
> rmb()
> copy area to temp
> rmb()
> if (begin == end) {
             ^^^^^^^^^^^^^^
sorry, typo cookie == begin

> copy temp to object
> do what needed
> }
> }
>
> Can I patent this? ;-))
>
> > >> I don't understand the appeal (or the mechanics) or making interport
> > >> connections be "internal" to a soundbox. The connections fundamentally
> > >> alter the order in which a series of soundboxes must be "executed", so
> > >> the engine must be able to fully determine the signal graph in order
> > >> to accomplish correct execution of the graph. "correct" means "no
> > >> cycle-duration delays between soundboxes unless there are feedback
> > >> loops between them". So some aspect of the connections must be
> > >> visible, at least to the engine.
> > >
> > >The engine knows everything about connections between its soundboxes,
> > >but knows anything about connections internal to soundboxes.
> >
> > You wrote "connections are internal to a soundbox" apparently to
> > indicate that you didn't follow why connections were visible at
> > all. So I interpreted what you wrote to mean "connections are only
> > internal to a soundbox".
>
> Some connections are internal to soundbox (if it contains other
> soundboxes), others are at application level.
>
> --
> Abramo Bagnara mailto:abramo_AT_alsa-project.org
>
> Opera Unica Phone: +39.546.656023
> Via Emilia Interna, 140
> 48014 Castel Bolognese (RA) - Italy
>
> ALSA project http://www.alsa-project.org
> It sounds good! 

-- 
Abramo Bagnara                       mailto:abramo_AT_alsa-project.org

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy

ALSA project               http://www.alsa-project.org
It sounds good!

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