[PD-dev] Pd-dev Digest, Vol 194, Issue 4

Miller Puckette msp at ucsd.edu
Tue Jun 8 00:12:08 CEST 2021


Seb's way is more work than mine but can achieve much higher performance.
(Incidentally, it's the approack Barry Vercoe took in his synthetic performer
of 1984 - the 4X gave him, I think, 256 "clocks" and he just used one of them
to wake him up every millisecond.


cheers
Miller
On Mon, Jun 07, 2021 at 09:09:37PM +0000, Sebastian Shader via Pd-dev wrote:
> In my WIP pdlua scripting library??https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_sebshader_lscoreI&d=DwIFaQ&c=-35OiAkTchMrZOngvJPOeA&r=XprZV3Fxus2L1LCw80hE4Q&m=fs1umRNWvWKgFPdv579MPzkVXMxlZbPGudp3p96wYcw&s=cOIw7ZYTWKm1EDsWEvU0kO3j05p6m0dXi0R1vNIKRws&e=  use 1 clock from pdlua for timing but then use my own heap/priority-queue-based scheduler as a wrapper for it.So if I need a new delay/clock I add it to my own scheduling queue, and then the priority queue pops the (next time - current time) for the??underlying t_clock that pdlua uses every time a delay occurs.(and then the clocks are used for delays within coroutine yields so you can write music)In my case I also need a lot more manipulations of the scheduling queues though (my next project is to have 1 scheduling queue peraccelerando/ritardando group so a tree of descendants of an ancestor coroutine that sprouted them can accelerando/ritardando together)
> -Seb
> 
> -----Original Message-----
> 
> Date: Sun, 6 Jun 2021 18:52:17 -0700
> From: Miller Puckette <msp at ucsd.edu>
> To: Iain Duncan <iainduncanlists at gmail.com>
> Cc: pd-dev <pd-dev at lists.iem.at>
> Subject: Re: [PD-dev] Creating delayed functions in Pd external?
> Message-ID: <20210607015217.4fb2ym5rl27d7olu at ucsd.edu>
> Content-Type: text/plain; charset=us-ascii
> 
> Well, Pd's own scheduler for clocks keeps them in a linked list and chases
> down it to set and unset them.?? So if you did anything smart for the
> scheme callbacks Pd would see to it that it's still linear time in the
> number of active callbacks.
> 
> cheers
> M
> 
> On Sun, Jun 06, 2021 at 06:22:41PM -0700, Iain Duncan wrote:
> > Thanks Miller. That brings up one more question.. ;-)
> > 
> > In Scheme for Max, the way I do it is I keep a hash-table in C going
> > with keys that are created on Scheme delay calls, so that one can cancel
> > clocks by fetching them from the hashtable. In Max, there's a
> > cross-platform hash-table implementation that I'm using. Is there something
> > similar for Pd, or if not, is there an approach you would recommend for
> > keeping a key-value store in C for the clocks by a symbolic key? I guess a
> > good question might be if this is even necessary, given there can't be
> > *that* many clocks scheduled for the future. And association list type
> > thing might do just as well.
> > 
> > thanks for the help, it's going well, now that I can finally work on it!
> > ought to have a first alpha folks can play with in the next couple of weeks.
> > iain
> > 
> > 
> > 
> > On Sun, Jun 6, 2021 at 5:36 PM Miller Puckette <msp at ucsd.edu> wrote:
> > 
> > > clock() is the only mechanism - for repeats, the easiest thing is often
> > > to just re-use a clock() and re-set it each time it goes off (as in
> > > the metro obejct).?? You can indeed create clock obejcts on the fly -
> > > that's what pipe does.?? But you'll want to keep track of them so you can
> > > cancel them if the owning object goes away.
> > >
> > > cheers
> > > M
> > >
> > > On Sun, Jun 06, 2021 at 05:16:09PM -0700, Iain Duncan wrote:
> > > > Ah fantastic, thanks. I was looking in pipe and not seeing it, but was
> > > > probably just lost in other new details and not seeing the forest for the
> > > > trees. :-)
> > > >
> > > > Couple of follow ups:
> > > > - is there a separate facility for making a repeated callback (ie not
> > > > one-shot), or does one just do both with clock?
> > > > - is it safe to make clocks as we need them (ie during a method call, not
> > > > necessarily at object instantiation time), or is this the kind of thing
> > > > where for real time use one needs to make a clock pool and a pool manager
> > > > and all that?
> > > >
> > > > thanks!
> > > > iain
> > > >
> > > > On Sun, Jun 6, 2021 at 5:12 PM Miller Puckette <msp at ucsd.edu> wrote:
> > > >
> > > > > Yep, clock_delay() .?? Simples example is in Pd's "delay" object,
> > > x_time.c
> > > > >
> > > > > cheers
> > > > > Miller
> > > > >
> > > > > On Sun, Jun 06, 2021 at 04:21:46PM -0700, Iain Duncan wrote:
> > > > > > Hi folks, I'm hoping someone can point me in the right direction
> > > here.
> > > > > I'm
> > > > > > porting Scheme for Max to pure data and I'm stuck figuring out how
> > > to get
> > > > > > delayed functions going. In Max, the SDK has a facility to make
> > > register
> > > > > a
> > > > > > callback to executed at some point in the future, a few different
> > > ways.
> > > > > Is
> > > > > > there a Pd equivalent, and if so, could anyone point me at resources
> > > or
> > > > > > code for it??? I basically just need to be able to have a callback
> > > fire
> > > > > off
> > > > > > at the right time with one argument, which can be void pointer to the
> > > > > rest
> > > > > > of the stuff i want to get.
> > > > > >
> > > > > > thanks!
> > > > > > iain
> > > > >
> > > > > > _______________________________________________
> > > > > > Pd-dev mailing list
> > > > > > Pd-dev at lists.iem.at
> > > > > >
> > > > >
> > > https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.puredata.info_listinfo_pd-2Ddev&d=DwICAg&c=-35OiAkTchMrZOngvJPOeA&r=XprZV3Fxus2L1LCw80hE4Q&m=uekrR-wLMB9CDNku0beRkRmoSJoExinRbBSlb0UQknQ&s=98jkGlO1FFE0Ea5fhSopCbZt6bmZH580Y0IUfgX4Rwk&e=
> > > > >
> > > > >
> > > > > --
> > > > >
> > >
> > > --
> > >
> 
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