[Python-Dev] [RFC] Removing pure Python implementation of OrderedDict (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Wed Sep 6 06:09:05 EDT 2017

On Wed, 6 Sep 2017 11:26:52 +0900 INADA Naoki <songofacandy at gmail.com> wrote:

Like that, should we say "atomic & threadsafe setitem for simple key is implementation detail of CPython and PyPy. We recommend using mutex when using OrderedDict from multiple thread."?

I think you may be overstating the importance of making OrderedDict thread-safe. It's quite rare to be able to rely on the thread safety of a single structure, since most often your state is more complex than that and you have to use a lock anyway.

The statu quo is that only experts rely on the thread-safety of list and dict, and they should be ready to reconsider if some day the guarantees change.

Regards

Antoine.

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