New submission from to7m <[email protected]>:
As best I can tell, sometimes when a Listener or Connection is not properly
initialised, the Client fails to communicate properly with it. Instead of
raising an exception, the Client hangs.
receiver.py:
from multiprocessing.connection import Listener
while True:
with Listener(("localhost", 10000), authkey=b"test") as listener:
with listener.accept() as connection:
print(connection.recv())
client.py (intended as a stress test):
from multiprocessing.connection import Client
for i in range(1000):
successfully_sent = False
while not successfully_sent:
try:
with Client(("localhost", 10000), authkey=b"test") as client:
client.send(i)
except (ConnectionRefusedError, ConnectionResetError):
continue
successfully_sent = True
Also noteworthy: I posted on StackExchange
(https://stackoverflow.com/questions/65276145/multiprocessing-receive-all-messages-from-multiple-runtimes)
and it seems that the code there (only 1000 messages) took around an hour to
run for a Windows user, whereas it would take less than a second to
successfully run on Linux.
----------
components: IO
files: receive.py
messages: 382945
nosy: to7m
priority: normal
severity: normal
status: open
title: Multiprocessing module hangs on os.read() on Linux
type: behavior
versions: Python 3.9
Added file: https://bugs.python.org/file49675/receive.py
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