[Stackless] comments on PEP 219
jeremy at alum.mit.edu
Tue Mar 13 19:30:37 CET 2001
>>>>> "BR" == Bernd Rinn <Bernd.Rinn at epost.de> writes:
BR> On Tue, Mar 13, 2001 at 12:17:39PM -0500, Gordon McMillan wrote:
>> The one instance I can find on the Stackless list (of attempting
>> to use a continuation across interpreter invocations) was a call
>> the uthread.wait() in __init__. Arguably a (minor) nuisance,
>> arguably bad coding practice (even if it worked).
[explanation of code practice that lead to error omitted]
BR> So I suspect that you might end up with a rule of thumb:
BR> """ Don't use classes and libraries that use classes when doing
BR> IO in microthreaded programs! """
BR> which might indeed be a problem. Am I overlooking something
BR> fundamental here?
Thanks for asking this question in a clear and direct way.
A few other variations on the question come to mind:
If a programmer uses a library implement via coroutines, can she
call library methods from an __xxx__ method?
Can coroutines or microthreads co-exist with callbacks invoked by
Can a program do any microthread IO in an __call__ method?
If any of these are the sort "in theory" problems that the PEP alludes
to, then we need a full spec for what is and is not allowed. It
doesn't make sense to tell programmers to follow unspecified
"reasonable" programming practices.
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