[PD-dev] Creating delayed functions in Pd external?

[Iain Duncan]

Thanks Christof, will hack further on this today!

iain

On Sun, Jun 6, 2021 at 7:00 PM Christof Ressi <info at christofressi.com>
wrote:

> getbytes() + freebytes()
>
> Christof
> On 07.06.2021 03:56, Iain Duncan wrote:
>
> Ah, ok. I also just realized (necessity being the mother of and all that)
> that I can probably be storing these on the scheme side too, as the actual
> function object is stored there anyway in a hash-table.
>
> Related: in Max they recommend using sysmem_newptr instead of malloc, is
> there a recommended cross-platform Pd replacement for malloc I should be
> using?
>
> thanks!
> iain
>
> On Sun, Jun 6, 2021 at 6:52 PM Miller Puckette <msp at ucsd.edu> wrote:
>
>> 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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