Issue #11870: Skip test_threading.test_2_join_in_forked_process() on platforms
with known OS bugs Share the list of platforms with known OS bugs with other tests. Patch written by Charles-François Natali.
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@ -410,6 +410,13 @@ class ThreadTests(BaseTestCase):
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class ThreadJoinOnShutdown(BaseTestCase):
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# Between fork() and exec(), only async-safe functions are allowed (issues
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# #12316 and #11870), and fork() from a worker thread is known to trigger
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# problems with some operating systems (issue #3863): skip problematic tests
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# on platforms known to behave badly.
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platforms_to_skip = ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5',
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'os2emx')
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def _run_and_join(self, script):
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script = """if 1:
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import sys, os, time, threading
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@ -440,6 +447,7 @@ class ThreadJoinOnShutdown(BaseTestCase):
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self._run_and_join(script)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
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def test_2_join_in_forked_process(self):
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# Like the test above, but from a forked interpreter
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script = """if 1:
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@ -456,15 +464,11 @@ class ThreadJoinOnShutdown(BaseTestCase):
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self._run_and_join(script)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
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def test_3_join_in_forked_from_thread(self):
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# Like the test above, but fork() was called from a worker thread
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# In the forked process, the main Thread object must be marked as stopped.
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# Skip platforms with known problems forking from a worker thread.
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# See http://bugs.python.org/issue3863.
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if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5',
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'os2emx'):
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raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
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script = """if 1:
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main_thread = threading.current_thread()
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def worker():
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@ -490,15 +494,11 @@ class ThreadJoinOnShutdown(BaseTestCase):
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self.assertEqual(data, expected_output)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
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def test_4_joining_across_fork_in_worker_thread(self):
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# There used to be a possible deadlock when forking from a child
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# thread. See http://bugs.python.org/issue6643.
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# Skip platforms with known problems forking from a worker thread.
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# See http://bugs.python.org/issue3863.
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if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'os2emx'):
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raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
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# The script takes the following steps:
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# - The main thread in the parent process starts a new thread and then
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# tries to join it.
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@ -567,6 +567,7 @@ class ThreadJoinOnShutdown(BaseTestCase):
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self.assertScriptHasOutput(script, "end of main\n")
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
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def test_5_clear_waiter_locks_to_avoid_crash(self):
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# Check that a spawned thread that forks doesn't segfault on certain
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# platforms, namely OS X. This used to happen if there was a waiter
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@ -579,10 +580,6 @@ class ThreadJoinOnShutdown(BaseTestCase):
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# lock will be acquired, we can't know if the internal mutex will be
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# acquired at the time of the fork.
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# Skip platforms with known problems forking from a worker thread.
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# See http://bugs.python.org/issue3863.
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if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'os2emx'):
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raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
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script = """if True:
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import os, time, threading
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