Issue with multiprocessing.Pool & multiprocessing.Queue

[bigbizze]

BPO	38833
Nosy	python_mp_pool_queue_issue.py

^{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 2019-11-17.17:42:34.527>
labels = ['3.8', 'type-bug', 'library']
title = 'Issue with multiprocessing.Pool & multiprocessing.Queue'
updated_at = <Date 2019-11-17.17:42:34.527>
user = 'https://github.com/bigbizze'

bugs.python.org fields:

activity = <Date 2019-11-17.17:42:34.527>
actor = 'bigbizze'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2019-11-17.17:42:34.527>
creator = 'bigbizze'
dependencies = []
files = ['48719']
hgrepos = []
issue_num = 38833
keywords = []
message_count = 1.0
messages = ['356822']
nosy_count = 1.0
nosy_names = ['bigbizze']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38833'
versions = ['Python 3.8']

[bigbizze]

When calling mp.Pool().apply_async(), and passing a mp.Queue() instance as an argument the execution halts.

This is contrasted by using mp.Manager().Queue() which when passed to apply_async() works as expected.