[Twisted-Python] shared list in factory, mutexes?

Gabriel Rossetti mailing_lists at evotex.ch
Tue Apr 15 07:24:12 EDT 2008

Simon Pickles wrote:
> Gabriel Rossetti wrote:
>> each thread is an individual self-contained unit that does whatever 
>> processing it needs to do however long it may need to take, and the 
>> OS takes care of scheduling each thread, but with twisted, the main 
>> thread executes each connection one by one sequentially and thus if 
>> one of them needs to to some lengthy processing, it will block all 
>> other connections from being processed, so you have to use threads to 
>> keep it from blocking, but somehow the active connection should 
>> become inactive while the processing thread does it's work, so that 
>> another connection can be processed in the meantime.
> Hi Gabriel,
> Have you considered implementing Stackless python in partnership with 
> Twisted? I am finding it very useful for handling multiple concurrent 
> connections in a single thread. (it uses a scheduler which can switch 
> between tasklets, in a yield fashion.)
> The programmer has complete control over where this tasklet switching 
> takes place, vastly simplifying things over multi-threading. If one 
> connection involves some heavy processing, I simply add a 
> stackless.schedule() in the blocking loop which allows waiting jobs to 
> run too. Overhead for this tasklet switching is almost negligible too, 
> unlike threads.
> Regards
> Simon
Thanks Simon, I'll look into that, but I think that now that I 
understand better how twisted works, I'll stick with it "purely" :-)

Stackless is a python distrib though, from what I see.


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