[linux-audio-dev] Audio/Midi system - RT prios..

[Florian Schmidt]

On Fri, 30 Dec 2005 11:54:56 -0500
Paul Davis <paul at linuxaudiosystems.com> wrote:

> you don't know the correct priority to use. i imagine an api along the
> lines of:

true.

> 
> 	jack_create_thread (pthread_t*, void* (thread_function)(void*), 
>                             void* arg, int relative_to_jack);
> 
> the last argument would specify that the thread should run at, above or
> below the jack RT thread(s) by a given amount. typical values would be 
> +1, 0, -1 etc.

Why not simply

/* 
 * returns the priority (1-99) of the jack main loop (which is already one 
 * above the clients' process() threads or 0 if not realtime. Clients having 
 * a midi handling thread should create it with a priority at least one 
 * above the return value of this function.
 */
int jack_get_rt_priority();

Then the app can decide itself about how to create the thread.

> > Agreed. why not make it prio 98 by default then? (system timer should
> > still be higher i suppose). With a difference of only 10 between main
> > jack loop and the watchdog, it might get a little crowded :)
> 
> good point.

OTOH, i'm not really sure if 9 priority levels isn't enough. It seems
one above jacks main thread should be good enough for most midi purposes.

Flo

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