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

Lee Revell rlrevell at joe-job.com
Fri Dec 30 23:40:20 UTC 2005


On Sat, 2005-12-31 at 00:31 +0100, Florian Schmidt wrote:
> On Fri, 30 Dec 2005 20:54:53 +0100
> "Ralf Beck" <musical_snake at gmx.de> wrote:
> 
> > Suppose a jack thread is running and your midiin device irq comes in but not
> > through,
> > because the device's irq thread has lower priority and does not get
> > scheduled!
> 
> This is an interesting question: How is midi activity on physical ports
> handled? Is it polled? Or is the soundcard IRQ used for this, too? In
> the latter case the soundcard IRQ should definetly have a higher prio
> than all jack stuff.

The relative priorities of the JACK and soundcard IRQs really don't
matter because they never contend - one is woken up by the other.

Lee




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