[linux-audio-dev] Audio/Midi system - RT prios..
fons.adriaensen at skynet.be
Fri Dec 30 17:32:45 UTC 2005
On Fri, Dec 30, 2005 at 11:54:56AM -0500, Paul Davis wrote:
> you don't know the correct priority to use. i imagine an api along the
> lines of:
> 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.
- It's fairly easy to find out a JACK client's thread priority - some
of my apps, e.g. Aeolus do this to set their thread priorities relative
- It could be wise to express *all* (including JACK's) priorities relative
to the maximum. That way things will still work when the kernel developers
decide to revise their numbering scheme.
- Some apps may want to run as well without linking to libjack, so I'm not
so sure that this is the right place for a RT-thread creation routine.
Anyway, unless you want to use capabilities or work around completely
broken things such as NPTL 0.60, creating a RT thread *is* quite simple.
If you are using an application framework or toolkit, and it provides
safe communication between RT and e.g. GUI threads, then it probably
will have a call to do it anyway.
Best wishes to all !
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