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import os
import multiprocessing.util
import multiprocessing
_start_method_set = False
def apply_workaround():
global _start_method_set
# Set start method for multiprocessing to fork (3.4+)
set_start_method = getattr(multiprocessing, 'set_start_method', None)
if not _start_method_set and set_start_method:
set_start_method('fork')
_start_method_set = True
# Implements:
# https://github.com/python/cpython/commit/e8a57b98ec8f2b161d4ad68ecc1433c9e3caad57
#
# Detection of fix: os imported to compare pids, before the fix os has not
# been imported
if getattr(multiprocessing.util, 'os', None):
return
class FixedFinalize(multiprocessing.util.Finalize):
def __init__(self, *args, **kwargs):
super(FixedFinalize, self).__init__(*args, **kwargs)
self._pid = os.getpid()
def __call__(self, *args, **kwargs): # pylint: disable=signature-differs
if self._pid != os.getpid():
return None
return super(FixedFinalize, self).__call__(*args, **kwargs)
setattr(multiprocessing.util, 'Finalize', FixedFinalize)