sound/gui interaction

sound/gui interaction

[douglas irving repetto]

hi there linux-sound,


i'm working on a linux sound app. my signal processing loop runs in its
own thread. whenever i do a full drawing update of my GUI, i get a
glitch in the sound output. my CPU usage goes up during the redraw, but
not very much. does anyone know what's happening and how i can avoid it?
i would think that doing the graphics and the sound in seperate threads
would shield the one from the other, but apparently that's not the case.
is this an XWindows issue perhaps?

thanks,
douglas


-- 
                        douglas irving repetto 
                  http://music.columbia.edu/~douglas 
                the music-dsp mailing list and website:
                  http://shoko.calarts.edu/musicdsp

Re: sound/gui interaction

[Conrad Parker]

On Thu, Jul 20, 2000 at 01:15:07AM -0400, douglas irving repetto wrote:
> 
> hi there linux-sound,
> 
> i'm working on a linux sound app. my signal processing loop runs in its
> own thread. whenever i do a full drawing update of my GUI, i get a
> glitch in the sound output. my CPU usage goes up during the redraw, but
> not very much. does anyone know what's happening and how i can avoid it?
> i would think that doing the graphics and the sound in seperate threads
> would shield the one from the other, but apparently that's not the case.
> is this an XWindows issue perhaps?

your thinking is pretty much correct (as threads in Linux are
independently scheduled). What's most important is which thread is
writing to the sound device -- make sure you're not doing your
write()s in the same thread as dealing with X events.

If that's not the case... can we see the code?

Conrad.