Nathaniel Smith added the comment:

On further investigation (= a few hours staring at the ceiling last night), it 
looks like there's another explanation for my particular bug... which is good, 
because on further investigation (= a few hours squinting at google results) it 
looks like this probably can't happen on x86/x86-64 (I think? maybe?).

It's still true though that you can't just throw in a 'volatile' and expect 
cross-thread synchronization to work -- that's not C's semantics, and it's not 
true on popular architectures like ARM.

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<http://bugs.python.org/issue31119>
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