[Python-Dev] Proposed PEP: Optimizing Global Variable and Attribute Access

Aahz Maruch aahz at panix.com
Fri Aug 17 02:39:58 CEST 2001


In article <mailman.997792702.17326.python-list at python.org>,
Skip Montanaro  <skip at pobox.com> wrote:
>
>    Roman> What about threads? What if math.sin changes while in cache?
>
>I added the following to a new Questions section:
>
>Q.  What about threads?  What if math.sin changes while in cache?
>
>A.  I believe the global interpreter lock will protect values from being
>    corrupted.  In any case, the situation would be no worse than it is
>    today.  If one thread modified math.sin after another thread had
>    already executed "LOAD_GLOBAL math", but before it executed
>    "LOAD_ATTR sin", the client thread would see the old value of
>    math.sin. 

Yup, more or less.
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