[Python-Dev] _tkinter problem with Stackless

[Christian Tismer]

Jack Jansen wrote:

...

> For that one case (tkinter), but not in general. Would it be possible to 
> somehow restructure this the other way around, i.e. not slice stacks 
> unless you know that all frames on the stack so far don't mind? I'm 
> thinking of something similar to BEGIN_ALLOW_THREADS: any naive 
> extension module whose author didn't know about Python threading will 
> still work fine in a threaded Python, because it'll just hold on to the 
> interpreter lock.

Yes I could do this and also considered it already:
This gets me into preparing a registry of all known
compatible extensions. I don't like to take on such a
role. Instead, I try to get the most popular stuff running,
wile notifying everybody else that her stuff won't work
without a bit of fiddling. At the time being, Stackless
can afford this slightly Etonian aproach...

> If this is impossible (which I can well imagine) then at the very least 
> we should have a macro KEEP_YOUR_DIRTY_FINGERS_OFF_MY_STACK() to tell 
> stackless that you've given away stack addresses to some external 
> package and you don't want your stack to be moved.

That's nearly exactly what I implemented for _tkinter:
macro INSANE_TO_SLICE_STACKS_FOR_N_RECURSIONS(N)
does the good job.
Will check this in, tomorrow.

ciao - chris
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