[Stackless] Fwd: Stackless on top of greenlets

Stephan Diehl stephan at transvection.de
Mon Feb 16 19:17:33 CET 2009


Hi,

it would be quite nice, if the different implementations could somehow
be united (I've written the pypy one, but never used it, so there are
indeed lots of errors lurking).
pypy's stackless is actually implemented using pypy's coroutine
implementation, which, in case CPython is used, is emulated by greenlets.

pypy's stackless
http://codespeak.net/svn/pypy/trunk/pypy/lib/stackless.py

has a corresponding test file
http://codespeak.net/svn/pypy/trunk/pypy/lib/app_test/test_stackless.py

which is supposed to be compatible with regular stackless as well.

Maybe we could come up with a set of tests that cover all of stackless
interface and therefore can be used to test our greenlet based
implementations against.

Cheers, Stephan

Richard Tew wrote:
> ---------- Forwarded message ----------
> From: Richard Tew <richard.m.tew at gmail.com>
> Date: Mon, Feb 16, 2009 at 11:21 AM
> Subject: Re: [Stackless] Stackless on top of greenlets
> To: Henk Punt <henkpunt at gmail.com>
> 
> 
> On Mon, Feb 16, 2009 at 10:33 AM, Henk Punt <henkpunt at gmail.com> wrote:
>> Can you give some pointers to those implementations?,
>>
>> The only one I could find is the one included in PyPy and that one is
>> not-working, e.g. it lacks certains methods in the API and also it
>> does not behave
>> exactly as stackless does, especially w.r.t. the order of task-scheduling.
>> Also it contains quite a lot of bugs, for instance raising an
>> exception in a task that is
>> blocked on a channel does not restore the correct balance and similar issues...
>>
> 
> None of the implementations I have seen have been perfect, including my own.
> 
> http://www.stackless.com/pipermail/stackless/2005-May/002416.html
> 
> Cheers,
> Richard.
> 
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