[PD] Checking for interest: Scheme interpreter external for PD

[Iain Duncan]

Hi Andy, well I've ordered your book to learn PD, so I'm at least that
committed! :-)  My overarching goal is to make tools for composing,
improvising, and sequencing, so at this point, I'm punting on signals.
First I want to support everything in Rick Taubes's Notes From the
Metalevel book, along with a bunch of my own ideas, for algorithmic and
computer assisted composition/improvisation. But I am hoping to get signals
into play eventually. Which makes this a good time for a question...

In Max, my understanding is that if Overdrive is on and Scheduler in
Interrupt is selected,  we actually get only two threads: low priority
thread running who knows when, and high priority thread alternating between
a pass of eating up the scheduler queue (up to the limit) and then a pass
of the audio vector render. So given that I'm forcing all messages to run
in the high priority thread (unless the user asks for danger-mode Any), I
*think* I should have no problem calling into S7 and sharing data from both
dsp perform routines and regular event scheduled messages. I have not,
however, actually done this yet. Can anyone tell me what the situation in
PD is there? Or point me at good docs/resources on how the threading and
scheduling works in PD?

Thanks
iain


On Fri, Oct 23, 2020 at 12:23 PM Andy Farnell <padawan12 at obiwannabe.co.uk>
wrote:

> My last love affair with parentheses was in Racket.
> Although my only ever somewhat successful musical adventures
> in this style were with Roger Dannenberg's CLM/Nyquist
>
> Lets see what happens if Iain brings S7 over.
>
> Iain, how are you thinking of handling signals
>  (or not)?
>
> andy
>
> On Fri, Oct 23, 2020 at 11:31:48AM +0200, Kjetil Matheussen wrote:
> > On Thu, Oct 22, 2020 at 10:26 AM Andy Farnell
> > <padawan12 at obiwannabe.co.uk> wrote:
> > >
> > > Would love to see Scheme come to Pd.
> > >
> > There's also k_guile from 2004, that still compiles:
> > https://github.com/kmatheussen/k_guile
> > Don't know if it still works though.
> >
> > Guess there are other alternatives as well, but they all probably
> > suffer a bit from gc non-rt performance. To fix this I later extended
> > the code from k_guile to run in a separate thread to avoid cpu spikes,
> > but this code was only added to the snd sound editor (when snd was
> > compiled as a pd external), and that code was probably removed from
> > snd when switching from guile to s7.
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