[issue13521] Make dict.setdefault() atomic

[Filip Gruszczyński]

Filip Gruszczyński <gruszczy at gmail.com> added the comment:

I understand you are talking about this call:

mp->ma_lookup(mp, key, hash);

I haven't noticed that earlier. I'll try to provide a better fix (for 2.7 first, after we agree it's good enough, I will provide one for 3.3).

Do you have any idea, how I might this part? I mean how to check, that this is called only once?

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