[docs] [issue34172] multiprocessing.Pool and ThreadPool leak resources after being deleted

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

See also bpo-35424: "multiprocessing.Pool: emit ResourceWarning".

I wrote 10986 to fix 2 tests which leak resources.

I have a question. Why do tests have to call "pool.join()" after "with pool:"? When I use a file, I know that the resources are released after "with file:".

Should Pool.__exit__() call Pool.join()?

This question reminds me my fix in socketserver (bpo-31151 and bpo-31233) which leaked processes and threads, and my bug bpo-34037 (asyncio leaks threads).

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