New submission from Michael McAuliffe:
On Windows, I froze a script that uses multiprocessing with cx-freeze and
Python 3.4.1 that had freeze_support() in the "if __name__ == '__main__'"
section of the main module, and the resulting executable crashes with a
RuntimeError 'context has already been set'.
The error happens in a call to set_start_method in multiprocessing.spawn's
prepare function, and changing the line in spawn.py from:
if 'start_method' in data:
set_start_method(data['start_method'])
to:
if 'start_method' in data:
set_start_method(data['start_method'], force = True)
allows the frozen executable to successfully run.
----------
components: Library (Lib)
messages: 225719
nosy: Michael.McAuliffe
priority: normal
severity: normal
status: open
title: Multiprocessing freeze_support raises RuntimeError
type: crash
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue22255>
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