[Python-ideas] multiprocessing, freeze support by default for Pool

[Bradley Phillips]

Hi All

There are about 347 results for the following query on the google search
engine:
"python multiprocessing pyinstaller crash site:stackoverflow.com"

The windows fork bomb is a known frequent occurrence. I know that
freeze_support is supposed to be called but this issue still catches me out
most times (and many others).

I propose adding to line 117 of multiprocessing/context.py
        if (sys.platform == 'win32'):
            self.freeze_support()

Thanks
Regards
Brad
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