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Tue Mar 14 05:06:49 CET 2006 · http://mail.python.org/pipermail/python-dev/2006-March/062351.html

At 09:57 PM 3/13/2006 -0500, Raymond Hettinger wrote:
>FWIW, the new with-statement makes the above fragment even more readable:
>
>     with atomic_transaction():
>         # do a series of steps without interruption

+1 on the idea, -1000 on the name.  It's neither atomic nor a 
transaction.  I believe that "critical section" is a more common term for 
what you're proposing.

Probably the primitive could be placed in the thread or threading module, 
so that it would be something like:

     with threading.critical_section():
         # ...

It might be nice to be able to escape out of the critical section using a 
nested with: statement, as this would allow you to treat much of a program 
as single-threaded, and then selectively allow task switching.  But I'm not 
sure what you'd call that API.  :)

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[Python-Dev] Threading idea -- exposing a global thread lock