`poolsize` parameter of the `newkeys` function causes an error.

[BWP09]

When I try to run rsa.newkeys(3072), it works fine without any errors. If I run rsa.newkeys(3072, poolsize=2), then it produces a very long error message, the last part of it being this:

File "C:\Users\BWP09\AppData\Local\Programs\Python\Python311\Lib\multiprocessing\spawn.py", line 138, in _check_not_importing_main
    raise RuntimeError('''
RuntimeError:
        An attempt has been made to start a new process before the
        current process has finished its bootstrapping phase.

        This probably means that you are not using fork to start your
        child processes and you have forgotten to use the proper idiom
        in the main module:

            if __name__ == '__main__':
                freeze_support()
                ...

        The "freeze_support()" line can be omitted if the program
        is not going to be frozen to produce an executable.

[sarthaknagoshe2002]

Hey! Did you find any solution?? I am facing the same issue

[koeppe-at-pdtec]

Hello,

i stumbled accross this issue as well. It can be triggered by invoking rsa.newkey() with a poolzize > 1

As i understand, this is an windows specific issue.

Here are 3 files, one that fails, one that is working as expected and a workoraound solution, by using a main function with guard.

example.zip