[alsa-devel] Warning Big Yield

[Joël Krähemann]

Am Freitag, den 15.08.2014, 08:58 +1000 schrieb Matt Flax:
> On 15/08/14 01:45, Clemens Ladisch wrote:
> > Joël Krähemann wrote:
> >> I'd really like to know if there's a common way to do syncing
> >> applications. What frequencies are required to run a GUI?
> > GUIs should be event based; the term "frequency" is not applicable.
> >
> >> How does Xorg work
> > It's event based.
> 
> Yes, event based.
> For example, when using gtk ... if you want to update your GUI, you 
> probably want to use the gtk timer to regularly update at a rate which 
> suits your visual aesthetic.
> 
> You may already know this, but you can trigger a user function at 
> regular intervals :
> g_timeout_add
> https://developer.gnome.org/glib/2.37/glib-The-Main-Event-Loop.html
> 
> >> how can I prevent interfering with ALSA output?
> > By doing sound stuff in a separate thread with higher priority.
> You can do something similar to what Jack does to ensure higher 
> priority, check the file libjack/thread.c and look at the way they 
> increment the priority.
> 
> You may already know this, however in case not, you can get low 
> millisecond latency without dropping samples when using Linux ... i.e. 
> no interferance.
> That was last time I checked ... it is possible that this has improved 
> to a lower threshold since then !
> 
> Matt
> 
> >> Warning you may experience big yield.
> > ???
> >
> > Regards,
> > Clemens
> > _______________________________________________
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> > Alsa-devel at alsa-project.org
> > http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 
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With big yield I mean you hear a noise assumed you would call
pthread_yield to often.

It is strange how can I recognize more than 8 beats per second or even
more ...

I have modified my application not to do so, anymore.