Thread-safe way to add a key to a dict only if it isn't already there?
marko at pacujo.net
Sat Jul 7 17:00:26 EDT 2018
Ian Kelly <ian.g.kelly at gmail.com>:
> the leaning of the devs seems to be to refrain from documenting it and
> instead document that *no* operations are guaranteed atomic.
I believe that to be wise. Otherwise, Python would limit its future
The only thing Python should guarantee is that the data structures stay
"coherent" under race conditions. In other words, there cannot be a
segmentation fault. For example, if two threads executed this code in
i = 1
i += 1
a legal end result could be that i contains the string "impossible".
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