[issue21505] cx_freeze multiprocessing bug

[Torsten Landschoff]

Torsten Landschoff added the comment:

That sounds like you did not initialize the freeze support of the multiprocessing module:

https://docs.python.org/3/library/multiprocessing.html#multiprocessing.freeze_support

Basically, you need to add the following code to your main, before anything else:

    from multiprocessing import freeze_support
    freeze_support()

Interestingly, the documentation states that starting a new Process instance without freeze_support will raise a RuntimeError. Maybe the detection of that situation failed in your case?

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nosy: +torsten

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