[Stackless] stackless context managers

[Kristján Valur Jónsson]

Hi,
I think this is a better spot to discuss this topic than the checkin comments in Anselm's repo:
https://bitbucket.org/akruis/fg2python/commits/852868afc498e800e4091e83aa818bf5d7b35939#comment-406276

So, Anselm said:

Sorry for the delayed answer, here is the use case.

I tried to write a context manager that changes the execution host of the body. In __enter__ I pickle the tasklet and transfer the pickle to another process and unpickle it there. Then the tasklet executes until it calls __exit__. In exit I pickle it again and transfer it back to the original process.

This is really interesting.  How did it pan out?  Also, How does it work on the originating site?  A context manager does not (currently) allow the body code to be skipped, which I presume is what must happen on the "source" side.  (although, this here patch<http://bugs.python.org/issue18677> would allow that)

I'm very much a fan of context managers these days.  I just added stackless.atomic(), a built-in to provide performance for this ubiquitous thing.

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