[Python-Dev] Stackless Python
Phillip J. Eby
pje at telecommunity.com
Tue Jun 1 00:27:08 EDT 2004
At 08:17 PM 5/31/04 -0700, Guido van Rossum wrote:
> > If soft-switching is portable (i.e. pure C, no assembly), and is
> > exposed as a library module (so that Jython et al can avoid
> > supporting it), then perhaps a PEP for adding that functionality to
> > mainstream Python would be meaningful.
>Anything that can be supported by a pure extension module is fair game
>IMO. But it was my understanding that Stackless requires changes to
I did mean *exposed* as a library module, not implemented as one. I am
aware of the VM change.
> And I definitely don't want people to get into a habit of
>writing code that relies on deep recursion that is only supported by
>Stackless, only to find that it doesn't work in Jython etc.
From the docs of sys.setrecursionlimit():
"""The highest possible limit is platform-dependent. A user may need to set
the limit higher when she has a program that requires deep recursion and a
platform that supports a higher limit. This should be done with care,
because a too-high limit can lead to a crash."""
Seems to me that the platform-specific nature of this is already established.
> > If that gets in, then the other 5% can always sneak in later via
> > feature creep. ;) Or, more importantly (if I understand correctly),
> > it could be separately distributed as an add-on for platforms that
> > can support it.
>Hey, that's what Stackless already does. Why is that approach
>suddenly not good enough any more?
I didn't say that. I was just suggesting that if people had specific
features of Stackless that they wanted to see in CPython, that it would be
best for them to write a PEP specifically addressing the desired
feature(s), rather than asking "why isn't CPython stackless?"
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