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Thu Jan 7 22:11:36 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-January/097100.html

>> I don't think that's possible. The regex engine can also operate on
>> objects whose representation may move in memory when you don't hold
>> the GIL (e.g. buffers that get mutated).
> 
> Why is it a problem? If we get a buffer through the new buffer API, the object
> should ensure that the representation isn't moved away until the buffer is 
> released.

In 2.7, we currently get the buffer with bf_getreadbuffer. In 3.x, we have

    /* Release the buffer immediately --- possibly dangerous
       but doing something else would require some re-factoring
    */
    PyBuffer_Release(&view);

Even if we do use the new API, and correctly, it still might be
confusing if the contents of the buffer changes underneath.

Regards,
Martin

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[Python-Dev] GIL required for _all_ Python calls?