New submission from stevezh <cisji...@gmail.com>:
When shutdown the manager, Server's handle_request will send back message to
the manager, so is useless for the Server's shutdown method send back "None" to
the manager?
Source code from Lib/multiprocessing/managers.py:
def shutdown(self, c):
'''
Shutdown this process
'''
try:
util.debug('manager received shutdown message')
# Is useless here?
c.send(('#RETURN', None))
except:
import traceback
traceback.print_exc()
finally:
self.stop_event.set()
Server's handle_request may throw and catch exception because the conn is
closed in _finalize_manager() after Server's shutdown method returns.
code from handle_request():
try:
c.send(msg)
except Exception as e:
try:
c.send(('#TRACEBACK', format_exc()))
except Exception:
pass
code from _finalize_manager():
try:
conn = _Client(address, authkey=authkey)
try:
dispatch(conn, None, 'shutdown')
finally:
conn.close()
except Exception:
pass
Also the Server's shutdown method only used by manager class.
----------
components: Library (Lib)
messages: 306142
nosy: davin, jnoller, pitrou, sbt, stevezh
priority: normal
severity: normal
status: open
title: multiprocessing Server's shutdown method useless send message to manager
type: behavior
versions: Python 3.5, Python 3.6
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32014>
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