[Python-Dev] Stackless Python

Bob Ippolito bob at redivi.com
Wed Jun 2 01:37:59 EDT 2004

On Jun 2, 2004, at 1:14 AM, Phillip J. Eby wrote:

> At 12:31 AM 6/2/04 +0200, Christian Tismer wrote:
>>  If you have
>> to have compiled calls all the time, well, I did not invent Java,
>> and I don't want to know who was it. (Actually I do :)
> Keep in mind that Jython *compiles* Python code to Java bytecodes.  It 
> is *not* a Python interpreter written in Java.  I suspect this will 
> severely limit the applicable approaches.
> Googling "Java co-operative multitasking" and "Java asynchronous 
> methods" turns up plenty of hits on people who are trying to figure 
> out how to do them, but not much about any successes.  :)  Indeed, the 
> only thing I've ever run into that does it, is that commercial system 
> I mentioned, which does it by writing a Java VM in Java, so they can 
> control its execution.  I don't think that idea will go over very well 
> with the Jython team.  :)

Well the tasklet/channel model of Stackless is a single threaded 
version of CSP, which has at least one Java implementation:

If you add a bunch of extra mutexes, then it could act just like 
Stackless (no actual concurrency).

That, of course, doesn't cover every single function that the Stackless 
API currently exposes, but tasklets/channels are the raison d'etre.  
You don't really need the other functions (or at least, I haven't 
needed them).

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