[Python-Dev] Stackless Python

Bob Ippolito bob at redivi.com
Wed Jun 2 13:38:48 EDT 2004

On Jun 2, 2004, at 1:20 PM, Martin v. Löwis wrote:

> Bob Ippolito wrote:
>>> However, JCSP uses java.lang.Threads to implement concurrency. So 
>>> they
>>> are completely unlike Stackless' tasklets in their implementation
>>> strategy.
>> So what, if the API is the same?
> If you don't have a problem with that, I don't either.
>> Using the stack or not is an implementation detail, what matters is 
>> having more control over the flow of your programs in a reasonably 
>> efficient manner.  It just so happens that the recursive evaluation 
>> in CPython uses the stack in such a way that makes these kind of 
>> constructs impossible, so it needed to be changed for Stackless.
> That is simply not true. It is possible and straight-forward to
> implement Stackless' tasklets and channels on top of the standard
> Python, with no need to change the interpreter proper.

In my quick attempt to do CSP on top of CPython threads I learned that:
- It's not as easy as it sounds to get deterministic behavior out of 
threads, and debugging threaded python apps is no fun.
- When it does work, the performance sucks compared to Stackless.

Perhaps someone with more Python threading experience can prove me 

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