[Stackless] Stackless and Twisted [was: Stackless and Psyco]

Christian Tismer tismer at stackless.com
Wed Mar 3 01:49:20 CET 2004


Christopher Armstrong wrote:

> Christian Tismer wrote:

...

>> Is it possible to spell out what's wrong/missing in Stackless?
>> I'd really like to support Twisted; we need to share some information.
>> (I'm the specialist here, you are the specialist there...)
> 
> No no no, nothing wrong with stackless in the context of Twisted, at 
> least as far as this problem is concerned. It's just a fundamental issue 
> with context-switching when current, un-stacklessy code isn't expecting 
> it. It's not a major issue, like it is with regular pre-emptive 
> threading, but it can still be a concern in cases like I pointed out.

But Stackless does no automatic scheduling at the moment.
You mean the problem is that a function which knows what
it calls usually can expect that exactly that and nothing else
is run?
And if some code decides to schedule(), this assumption is broke?
So Twisted is doing something like "locking by call", in the sense
that it is implicitly locked, since *now just this* function
is able to run?
This would of course mean to need more explicit locking of
resources, if I understand this at all.

cheers -- chris

-- 
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