[pypy-dev] Re: [pypy-svn] r18743 - pypy/dist/pypy/module/stackless

Armin Rigo arigo at tunes.org
Fri Oct 21 11:59:36 CEST 2005

Hi all,

Re "continuation": I'm sorry for all the confusion.  I should have
called these objects what they really are in C, i.e. 'frame_stack_top'
objects.  Not more, not less.

This is the wrong level for language design!  It's just a quick hack to
expose some of the capabilities of the generated C code to RPython.  No
one should actually *use* these things at RPython level.  They are meant
to build mixedmodules on top of, and these mixedmodules should expose
saner and carefully designed concepts to app-level, like Tasklets,
greenlets, green threads, etc.  The real hard work is in building such
mixedmodules.  Anyway I'm sure that while doing so we will pretty soon
figure out that slightly or completely different things should be
exposed from C to RPython.

If you want a comparison, see pypy.rpython.ros.environ(idx) -> string.
It's a bizarre interface to get to the current environment from RPython:
you have to call it with increasing numbers until it returns None to
mean "there is no more environment variable".  It's only done this way
because it's straightforward to translate such a function to C.  But of
course it's only used by pypy.module.posix to expose the more usual
interface to app-level, via the 'os' module, and no one else should rely
on this strange RPython-level interface.

A bientot,


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