Assume the following python-program from the official docs (The Process class):
from multiprocessing import Process
def f(name):
print('hello', name)
if __name__ == '__main__':
p = Process(target=f, args=('bob',))
p.start()
p.join()
Running this code against my 3.7.7 interpreter on my Windows machine works, as expected, without any problems. However, running the same code against a Subinterpreter created in C++ fails with the following error (no Exception actually, the following error just gets printed to the console):
unrecognised option '-c'
I assume that the reason for this error is to be found in spawn.py (within the multiprocessing module, line 89):
...
return [_python_exe] + opts + ['-c', prog, '--multiprocessing-fork']
...
I could create my new process via Popen. This works, but the spawned process should be a child-process, not a completely independent process.
My question:
Why does this error occur? Is there any way to spawn a child process within a Subinterpreter via multiprocessing.Process?
Thank you!
UPDATE 1
As suggested, adding freeze_support fixes the error, but a new one occurs:
unrecognised option '--multiprocessing-fork'
