Multiprocessing docs don't describe thread-safety

[bensimner]

BPO	40815
Nosy	@alanbriolat, @bensimner, @iritkatriel

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-05-29.13:25:00.812>
labels = ['docs']
title = "Multiprocessing docs don't describe thread-safety"
updated_at = <Date 2020-08-17.18:29:13.905>
user = 'https://github.com/bensimner'

bugs.python.org fields:

activity = <Date 2020-08-17.18:29:13.905>
actor = 'iritkatriel'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2020-05-29.13:25:00.812>
creator = 'bjs'
dependencies = []
files = []
hgrepos = []
issue_num = 40815
keywords = []
message_count = 3.0
messages = ['370310', '375103', '375563']
nosy_count = 4.0
nosy_names = ['docs@python', 'alan.briolat', 'bjs', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue40815'
versions = []

[bensimner]

The Multiprocessing docs specifically say that Queue is process- and thread- safe: https://docs.python.org/3/library/multiprocessing.html#exchanging-objects-between-processes.

But this information is not given for the various synchronisation primitives and such (Lock, Semaphore, Event, etc)

Are they thread-safe? Should the docs say whether they are or are not?

[iritkatriel]

Here's an example where such documentation may have helped: https://bugs.python.org/issue40860

[iritkatriel]

Probably another example: bpo-41567