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Fix multiprocessing start method for Python 3.14 compatibility #41023

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Merged
merged 1 commit into from
Oct 16, 2025
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Fix multiprocessing start method for Python 3.14 compatibility #41023

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5 changes: 3 additions & 2 deletions src/sage/doctest/external.py
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Original file line number Diff line number Diff line change
Expand Up @@ -37,8 +37,9 @@
# With OS X, Python 3.8 defaults to use 'spawn' instead of 'fork' in
# multiprocessing, and Sage doctesting doesn't work with 'spawn'. See
# trac #27754.
if platform.system() == 'Darwin':
multiprocessing.set_start_method('fork', force=True)
# With Python 3.14, the default changed to 'forkserver' on Linux as well.
# Sage doctesting requires 'fork' method.
multiprocessing.set_start_method('fork', force=True)
Array = multiprocessing.Array

# Functions in this module whose name is of the form 'has_xxx' tests if the
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5 changes: 3 additions & 2 deletions src/sage/doctest/forker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -91,8 +91,9 @@
# With OS X, Python 3.8 defaults to use 'spawn' instead of 'fork' in
# multiprocessing, and Sage doctesting doesn't work with 'spawn'. See
# trac #27754.
if platform.system() == 'Darwin':
multiprocessing.set_start_method('fork', force=True)
# With Python 3.14, the default changed to 'forkserver' on Linux as well.
# Sage doctesting requires 'fork' method.
multiprocessing.set_start_method('fork', force=True)


def _sorted_dict_pprinter_factory(start, end):
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