https://github.com/python/cpython/commit/5cb54c9c09ce64b26d1d922f36093969b4ca4c81
commit: 5cb54c9c09ce64b26d1d922f36093969b4ca4c81
branch: main
author: Victor Stinner <[email protected]>
committer: vstinner <[email protected]>
date: 2026-05-25T23:04:14+02:00
summary:
gh-149879: Fix test_concurrent_futures on Cygwin (#150415)
On Cygwin, skip tests using "forkserver" start method.
Don't check BrokenProcessPool.__cause__, it's not set on Cygwin.
files:
M Lib/test/test_concurrent_futures/test_init.py
M Lib/test/test_concurrent_futures/test_process_pool.py
M Lib/test/test_concurrent_futures/util.py
diff --git a/Lib/test/test_concurrent_futures/test_init.py
b/Lib/test/test_concurrent_futures/test_init.py
index 5ea543bf7489821..ca612db17ce8021 100644
--- a/Lib/test/test_concurrent_futures/test_init.py
+++ b/Lib/test/test_concurrent_futures/test_init.py
@@ -147,6 +147,8 @@ def test_spawn(self):
self._test(ProcessPoolSpawnFailingInitializerTest)
@support.skip_if_sanitizer("TSAN doesn't support threads after fork",
thread=True)
+ @unittest.skipIf(sys.platform == "cygwin",
+ "Forkserver is not available on Cygwin")
def test_forkserver(self):
self._test(ProcessPoolForkserverFailingInitializerTest)
diff --git a/Lib/test/test_concurrent_futures/test_process_pool.py
b/Lib/test/test_concurrent_futures/test_process_pool.py
index 731419a48bd1281..da70d910dc35614 100644
--- a/Lib/test/test_concurrent_futures/test_process_pool.py
+++ b/Lib/test/test_concurrent_futures/test_process_pool.py
@@ -115,11 +115,12 @@ def
test_traceback_when_child_process_terminates_abruptly(self):
with self.assertRaises(BrokenProcessPool) as bpe:
future.result()
- cause = bpe.exception.__cause__
- self.assertIsInstance(cause, futures.process._RemoteTraceback)
- self.assertIn(
- f"terminated abruptly with exit code {exit_code}", cause.tb
- )
+ if sys.platform != 'cygwin':
+ cause = bpe.exception.__cause__
+ self.assertIsInstance(cause, futures.process._RemoteTraceback)
+ self.assertIn(
+ f"terminated abruptly with exit code {exit_code}", cause.tb
+ )
@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
@hashlib_helper.requires_hashdigest('md5')
diff --git a/Lib/test/test_concurrent_futures/util.py
b/Lib/test/test_concurrent_futures/util.py
index 2a9e55152b82d54..006360c8d941c9d 100644
--- a/Lib/test/test_concurrent_futures/util.py
+++ b/Lib/test/test_concurrent_futures/util.py
@@ -135,7 +135,7 @@ def get_context(self):
_check_system_limits()
except NotImplementedError:
self.skipTest("ProcessPoolExecutor unavailable on this system")
- if sys.platform == "win32":
+ if sys.platform in ("win32", "cygwin"):
self.skipTest("require unix system")
if support.check_sanitizer(thread=True):
self.skipTest("TSAN doesn't support threads after fork")
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