New submission from Jeff DuMonthier <jeffrey.j.dumonth...@nasa.gov>:
The following simple example code creates a started SyncManager and passes it
as an argument to a subprocess started with multiprocessing.Process(). It
works on Linux and Mac OS but fails on Windows.
import multiprocessing as mp
def subProcFn(m1):
pass
if __name__ == "__main__":
__spec__ = None
m1 = mp.Manager()
p1 = mp.Process(target=subProcFn, args=(m1,))
p1.start()
p1.join()
This is the traceback in Spyder:
runfile('D:/ManagerBug.py', wdir='D:')
Traceback (most recent call last):
File "<ipython-input-1-534b9087bae9>", line 1, in <module>
runfile('D:/ManagerBug.py', wdir='D:')
File "...\anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py",
line 705, in runfile
execfile(filename, namespace)
File "...\anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py",
line 102, in execfile
exec(compile(f.read(), filename, 'exec'), namespace)
File "D:/ManagerBug.py", line 22, in <module>
p1.start()
File "...\anaconda3\lib\multiprocessing\process.py", line 105, in start
self._popen = self._Popen(self)
File "...\anaconda3\lib\multiprocessing\context.py", line 223, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "...\anaconda3\lib\multiprocessing\context.py", line 322, in _Popen
return Popen(process_obj)
File "...\anaconda3\lib\multiprocessing\popen_spawn_win32.py", line 65, in
__init__
reduction.dump(process_obj, to_child)
File "...\anaconda3\lib\multiprocessing\reduction.py", line 60, in dump
ForkingPickler(file, protocol).dump(obj)
TypeError: can't pickle weakref objects
----------
components: Windows
messages: 313964
nosy: jjdmon, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Cannot pass a SyncManager proxy to a multiprocessing subprocess on
Windows
type: behavior
versions: Python 3.6
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33088>
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