[PD] threads with -rt

[Davide Morelli]

Hi list,

I'm having the following problem: if i start pd with -rt flag and try to
load a soundfile using  [sndfiler] I get huge xruns. 
jackd is started with -R

I noticed the same with a flext external I wrote, the second thread has a
lower priority but it still too high if the main thread is started with -rt
and if its CPU usatge is too high it can crash jackd

what is the correct procedure to load a soundfile in a threaded xruns-free
way?

ciao,
davide.