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gh-91231: Add shutdown_timeout to multiprocessing BaseManager (#32112)

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Add an optional keyword 'shutdown_timeout' parameter to the
multiprocessing.BaseManager constructor. Kill the process if
terminate() takes longer than the timeout.

Multiprocessing tests pass test.support.SHORT_TIMEOUT
to BaseManager.shutdown_timeout.
This commit is contained in:
Victor Stinner 2022-04-19 16:27:00 +02:00 • committed by GitHub
parent 74070085da
commit 061a8bf77c
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4 changed files with 49 additions and 20 deletions
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16
Lib/multiprocessing/managers.py
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@ -497,7 +497,7 @@ class BaseManager(object):
_Server = Server
def __init__(self, address=None, authkey=None, serializer='pickle',
ctx=None):
ctx=None, *, shutdown_timeout=1.0):
if authkey is None:
authkey = process.current_process().authkey
self._address = address # XXX not final address if eg ('', 0)
@ -507,6 +507,7 @@ class BaseManager(object):
self._serializer = serializer
self._Listener, self._Client = listener_client[serializer]
self._ctx = ctx or get_context()
self._shutdown_timeout = shutdown_timeout
def get_server(self):
'''
@ -570,8 +571,8 @@ class BaseManager(object):
self._state.value = State.STARTED
self.shutdown = util.Finalize(
self, type(self)._finalize_manager,
args=(self._process, self._address, self._authkey,
self._state, self._Client),
args=(self._process, self._address, self._authkey, self._state,
self._Client, self._shutdown_timeout),
exitpriority=0
)
@ -656,7 +657,8 @@ class BaseManager(object):
self.shutdown()
@staticmethod
def _finalize_manager(process, address, authkey, state, _Client):
def _finalize_manager(process, address, authkey, state, _Client,
shutdown_timeout):
'''
Shutdown the manager process; will be registered as a finalizer
'''
@ -671,15 +673,17 @@ class BaseManager(object):
except Exception:
pass
process.join(timeout=1.0)
process.join(timeout=shutdown_timeout)
if process.is_alive():
util.info('manager still alive')
if hasattr(process, 'terminate'):
util.info('trying to `terminate()` manager process')
process.terminate()
process.join(timeout=0.1)
process.join(timeout=shutdown_timeout)
if process.is_alive():
util.info('manager still alive after terminate')
process.kill()
process.join()
state.value = State.SHUTDOWN
try: