8000 gh-135335: flush stdout/stderr in forkserver after preloading modules by duaneg · Pull Request #135338 · python/cpython · GitHub
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gh-135335: flush stdout/stderr in forkserver after preloading modules #135338

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Merged
merged 15 commits into from
Jun 18, 2025
Merged

gh-135335: flush stdout/stderr in forkserver after preloading modules #135338

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d59b229
gh-135335: flush stdout/stderr in forkserver after preloading modules
duaneg Jun 10, 2025
552266f
Attempt to fix MacOS test failures
duaneg Jun 10, 2025
6e36eea
Check stderr first to get details of assertion failures
duaneg Jun 10, 2025
33f9956
Further minor diagnostic improvements upon test failure
duaneg Jun 12, 2025
9944968
Set start method explicitly to "forkserver" so it works on MacOS (and…
duaneg Jun 16, 2025
1523e74
Address reviewer feedback: introduce some intermediate variables and …
duaneg Jun 17, 2025
2125574
Update Lib/test/_test_multiprocessing.py
duaneg Jun 17, 2025
db298cb
Additional review feedback: add comment and align ordering
duaneg Jun 17, 2025
f9bab0a
Update Lib/test/mp_preload_flush.py
duaneg Jun 17, 2025
4ffa138
Show default diff on unexpected stdout/err
duaneg Jun 17, 2025
4d57d74
Update Lib/test/_test_multiprocessing.py
duaneg Jun 17, 2025
e73ea34
Update Misc/NEWS.d/next/Library/2025-06-10-21-42-04.gh-issue-135335.W…
duaneg Jun 17, 2025
3f07ff7
Remove redundant check
duaneg Jun 17, 2025
da4df44
Don't write an newline to avoid any implicit flushes that might happen
duaneg Jun 18, 2025
fdb30e1
Be consistent and do not rely on asserts being enabled
duaneg Jun 18, 2025
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Update Lib/test/_test_multiprocessing.py 
Co-authored-by: Victor Stinner <vstinner@python.org>
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@duaneg @vstinner
duaneg and vstinner authored Jun 17, 2025
commit 4d57d74133b955a322b67450b2a56e702ec61936
2 changes: 1 addition & 1 deletion Lib/test/_test_multiprocessing.py
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Expand Up @@ -6813,7 +6813,7 @@ def test_std_streams_flushed_after_preload(self):
dirname = os.path.join(self._temp_dir, 'preloaded_module')
init_name = os.path.join(dirname, '__init__.py')
os.mkdir(dirname)
with open(os.path.join(init_name), "w") as f:
with open(init_name, "w") as f:
cmd = '''if 1:
import sys
print('stderr', file=sys.stderr)
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