diff --git a/Doc/library/multiprocessing.rst b/Doc/library/multiprocessing.rst index 5516084780673fb9e90042d6cb5eaa4758aeb561..b5ceeb796f8f2f25e410c3fa9563450c8932114a 100644 --- a/Doc/library/multiprocessing.rst +++ b/Doc/library/multiprocessing.rst @@ -1089,10 +1089,14 @@ Miscellaneous .. versionchanged:: 3.11 Accepts a :term:`path-like object`. -.. function:: set_start_method(method) +.. function:: set_start_method(method, force=False) Set the method which should be used to start child processes. - *method* can be ``'fork'``, ``'spawn'`` or ``'forkserver'``. + The *method* argument can be ``'fork'``, ``'spawn'`` or ``'forkserver'``. + Raises :exc:`RuntimeError` if the start method has already been set and *force* + is not ``True``. If *method* is ``None`` and *force* is ``True`` then the start + method is set to ``None``. If *method* is ``None`` and *force* is ``False`` + then the context is set to the default context. Note that this should be called at most once, and it should be protected inside the ``if __name__ == '__main__'`` clause of the