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gh-149879: Fix multiprocessing tests on Cygwin - #150031

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vstinner merged 2 commits into
python:mainfrom
vstinner:mp_cygwin2
May 18, 2026
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gh-149879: Fix multiprocessing tests on Cygwin#150031
vstinner merged 2 commits into
python:mainfrom
vstinner:mp_cygwin2

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@vstinnervstinner commented May 18, 2026•
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  • Disable AF_UNIX connection family on Cygwin.
  • forkserver start method is not available on Cygwin: update tests for that.

@vstinner
pythongh-149879: Fix multiprocessing tests on Cygwin
a1b3694
* Disable AF_UNIX connection family on Cygwin.
* forkserver start method is not available on Cygwin: update tests
for that.
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vstinner requested a review from gpshead as a code ownerMay 18, 2026 21:57
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vstinner commented May 18, 2026

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4 tests are still failing and require more investigation (they can be fixed in a separated PR):

test_multiprocessing_fork.test_processes
test_wait_result
test_multiprocessing_spawn.test_processes
test_wait_result
test_multiprocessing_fork.test_misc
test_resource_tracker_sigterm
test_multiprocessing_spawn.test_misc
test_resource_tracker_sigterm

The forkserver start method requires multiprocessing.reduction.HAVE_SEND_HANDLE which is False on Cygwin. Maybe we can support forkserver if the _winapi extension becomes available on Cygwin.

@vstinner
vstinner requested a review from vsajip as a code ownerMay 18, 2026 22:12
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vstinner merged commit 9eb50a4 into python:mainMay 18, 2026
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vstinner deleted the mp_cygwin2 branch May 18, 2026 22:45
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