[PD] [PD-announce] Pd 0.41 test 10 released

Thomas Grill gr at grrrr.org
Fri Dec 28 20:47:26 CET 2007

Am 28.12.2007 um 20:25 schrieb Miller Puckette:

> I should have put the lock in and forgot... thanks for the reminder.
> I'm not at all sure how to handle "idle" in the callback case.  One
> could just call the function forever, but that seems like burning the
> CPU for nothing.

You might have noticed that the idle callback function in pd-devel  
returns 0 (when it never wants to be called again), 1 (when it wants  
to be called again as soon as possible) or 2 (when it wants to be  
called again at the next scheduler iteration). This works pretty well  
and helps to preserve cpu.

> Alternatively, "idle" processing might want to take place
> in a different thread to be set up by whatever external code wants to
> do the idle processing, trusting to the OS to preempt to the callback
> thread when it becomes runnable.

It's a cleaner approach given the fact that the functionality allowed  
within the audio driver callback is limited, but it involves locking  
which isn't nice.


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