On Thu, 2007-04-05 at 18:46 +0200, Fons Adriaensen wrote:
> On Thu, Apr 05, 2007 at 12:30:25PM -0400, Dave
Robillard wrote:
>
> > Just a random thought:
> >
> > Would it be beneficial/possible for the 'wait'
call and the 'notify jack
> > we're done' call, so the thread can do something
in the interim? e.g.
> >
> > while (true) {
> > jack_wait()
> >
> > read_input()
> > process_things()
> > deliver_output()
> >
> > jack_done()
> >
> > do_some_other_stuff()
> > }
>
> Two fundamental problems (which amount to the same
one):
>
> Who (which thread) is going to wait for the next
callback ?
> What if the thread is still 'doing something' when the
next
> callback is due ?
>
> A thread is only a single thread, it can only be in one
place
> at a time...
The extra bit would need to adhere to realtime guidelines as
well, as
mentioned.
There is only one thread we're talking about here; one
thread, one
place, one time. It is the one that will wait for the next
callback,
via jack_wait(). If it's doing something at the time,
jack_wait() will
just return immediately.
I figure this just allows apps to shave a few ms off the
time jackd
needs to wait for them, in the case where the audio thread
has things to
do at the end of a cycle which don't actually have a direct
effect on
the output delivered that cycle (or equivalently, things to
do at the
beginning of a cycle which don't have a direct dependency on
the input
of that cycle)
That said, the benefit gained might not be applicable to
enough apps, or
significant enough to make it worthwhile. Just a thought.
-DR-
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