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pythonmultiprocessingpool

prevent AssertionError: daemonic processes are not allowed to have children

I am running stuff using Pool/multiprocessing. Whenever I call Pool again (nested) within one of the child processes of the main process, this error is raised?

prevent multiprocessing gives AssertionError: daemonic processes are not allowed to have children

Is there a way to detect if code is running already part of a Pool, to be able to prevent this error?

Solution

  • Yes, you can get the current process instance and check whether it is daemonic or not:

    from multiprocessing import process

print(f"is current process daemonic: {process.current_process().daemon}")

    Output:

    is current process daemonic: False

    Inside a pool, that .daemon property will be True