Antoine Pitrou <pit...@free.fr> added the comment:

Generally speaking, queues can remain in an inconsistent state after a process 
crash (because the process might have crashed just after acquiring a shared 
semaphore or sending part of a large message).  It's not obvious to me how we 
could make them safer, at least under Unix where there's no widely-available 
message-oriented communication facility that I know of.

----------
nosy: +davin, pitrou
versions: +Python 3.7

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<https://bugs.python.org/issue31886>
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