Hi Benoit: ________________________________ From: Benoit Chesneau <benoitc@gunicorn.org> To: Andrew Francis <andrewfr_ice@yahoo.com> Cc: "python-ideas@python.org" <python-ideas@python.org> Sent: Tuesday, October 23, 2012 5:48 PM Subject: Re: [Python-ideas] yield from multiple iterables (was Re: The async API of the future: yield-from) On Oct 23, 2012, at 6:51 PM, Andrew Francis <andrewfr_ice@yahoo.com> wrote: AF>This may be tangential to the discussion but in the past, I have used the stackless.py module in conjunction with AF>CPython and greenlets to rapidly prototype parts of Go's model that are not present in Stackless, i.e. the select (ALT) AF>language feature. Rob Pike and Russ Cox were really helpful in answering my questions. Newer stackless.py AF>implementations use continuelets so look for an older PyPy implementation. AF>I have also prototyped a subset of Polyphonic C# join patterns. After I got the prototype running, I had an interesting AF>discussion with the authors of "Scalable Join Patterns."
Yes saw that. And actually some part of the Task code is based on stackless.py but using greenlets, >Channels have been slightly modified to be thread-safe and support buffering. Did you release your code >somewhere ? It could be interesting to put the experience further.
You may be mistaking my work with someone else. I didn't add buffering but that t is relatively easy to do without altering Stackless Python's internals. However I believe that synchronous channels with buffering is a simple and powerful concurrency model. Go's implementers got it right. John Reppy (currently a NSF director) talks about synchronous channel's power in a Concurrent ML book. If you go to to the Stackless repository example page http://code.google.com/p/stacklessexamples/wiki/StacklessExamples you will find the code for a modified stackless.py that implements Go's select statement. Since I am giving a talk in Toronto soon, I will soon release a new version of the join pattern version with documentation and examples. The code is about a year old and I have learnt new things. I can mail you an archive and you are free to play with it and ask questions. Since this is somewhat off-topic, the reason I mention all this is that if you want to experiment with a Go style system, I think it easiest to work from something like stackless.py and greenlets than start from scratch. Cheers, Andrew