[PD-dev] libpd partly working with pd instances

[Rich E via Pd-dev]

Thanks for the informative read.

On Mon, May 26, 2014 at 1:47 PM, Miller Puckette <msp at ucsd.edu> wrote:

> Short answer: I started discovering that there were static structures in
> Pd that had ponters to symbols - all such static structures would have to
> be
> tracked down and made per-instance.
>
> Longer one:
>
> The specific one I hit (but this could be only one of many problems hiding
> there) was every single static t_class (one per class).  This structure
> containes a list of symbols (message selectors) and associated function
> pointers (and more).
>

These are class-level selectors and function pointers only, no? It seems
like an acceptable limitation to me that symbols relative to a static class
definition be unique across the memory space. There is a similar limitation
in the obj-c runtime, not nice but that's just part of the language.

The part that seems like it would cause a great deal of confusion would be
things like send and receiver names, table names, etc.  How difficult is it
to make these per-instance and deal with classes as static objects that
need to use sys_lock() to ensure thread safety?  I realize this may not
suit every use case, but it seems like this would still greatly improve the
feasibility of using pd as a plug-in.

As a second alternative, I was wondering if it isn't possible to prepend a
unique per-instance arg to symbols like the ones mentioned above.  Of
course has threading issues that would need to be resolved...

cheers,
Rich
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