[issue1746071] class mutex doesn't do anything atomically

[Manuel Kaufmann]

Manuel Kaufmann added the comment:

I tested the patch and I found an error. It was missing a line "if 
call:" in the unlock function. I added it, and tested again with the 
ex.py example and it didn't found any threads locked at the same time.

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nosy: +humitos
Added file: http://bugs.python.org/file9505/mutex.diff

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