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fix: guard set_start_method against duplicate calls (GH-466) #483

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fix: guard set_start_method against duplicate calls (GH-466) #483

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15 changes: 13 additions & 2 deletions src/mutmut/__main__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@
from math import ceil
from multiprocessing import Lock
from multiprocessing import Pool
from multiprocessing import get_start_method
from multiprocessing import set_start_method
from os import makedirs
from os import walk
Expand Down Expand Up @@ -1229,8 +1230,18 @@ def stop_all_children(mutants: list[tuple[SourceFileMutationData, str, int | Non
m.stop_children()


# used to copy the global mutmut.config to subprocesses
set_start_method("fork")
# Guard against "context has already been set" when mutmut.__main__ is
# re-executed (see GH-466).
if get_start_method(allow_none=True) is None:
set_start_method("fork")
elif "mutmut.__main__" not in sys.modules:
warnings.warn(
"mutmut.__main__ was re-executed because it was not cached in "
"sys.modules. Use `mutmut run` instead of `python -m mutmut run` "
"to avoid this.",
stacklevel=1,
)

START_TIMES_BY_PID_LOCK = Lock()


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