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closes bpo-34650: Check if sched_getscheduler returns ENOSYS before declaring it supported. (GH-9228) 

musl doesn't support the scheduler API, but declares stubs that alway return ENOSYS.
This commit is contained in:
Benjamin Peterson 2018-09-12 15:12:24 -07:00 committed by GitHub
parent 6f82bffd2d
commit c7042224b8
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1 changed files with 15 additions and 3 deletions
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18
Lib/test/test_posix.py
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@ -25,6 +25,18 @@ _DUMMY_SYMLINK = os.path.join(tempfile.gettempdir(),
requires_32b = unittest.skipUnless(sys.maxsize < 2**32,
'test is only meaningful on 32-bit builds')
def _supports_sched():
if not hasattr(posix, 'sched_getscheduler'):
return False
try:
posix.sched_getscheduler(0)
except OSError as e:
if e.errno == errno.ENOSYS:
return False
return True
requires_sched = unittest.skipUnless(_supports_sched(), 'requires POSIX scheduler API')
class PosixTester(unittest.TestCase):
def setUp(self):
@ -1273,7 +1285,7 @@ class PosixTester(unittest.TestCase):
self.assertRaises(OSError, posix.sched_get_priority_min, -23)
self.assertRaises(OSError, posix.sched_get_priority_max, -23)
@unittest.skipUnless(hasattr(posix, 'sched_setscheduler'), "can't change scheduler")
@requires_sched
def test_get_and_set_scheduler_and_param(self):
possible_schedulers = [sched for name, sched in posix.__dict__.items()
if name.startswith("SCHED_")]
@ -1646,7 +1658,7 @@ class TestPosixSpawn(unittest.TestCase):
[sys.executable, "-c", "pass"],
os.environ, setsigdef=[signal.NSIG, signal.NSIG+1])
@unittest.skipUnless(hasattr(posix, 'sched_setscheduler'), "can't change scheduler")
@requires_sched
def test_setscheduler_only_param(self):
policy = os.sched_getscheduler(0)
priority = os.sched_get_priority_min(policy)
@ -1664,7 +1676,7 @@ class TestPosixSpawn(unittest.TestCase):
)
self.assertEqual(os.waitpid(pid, 0), (pid, 0))
@unittest.skipUnless(hasattr(posix, 'sched_setscheduler'), "can't change scheduler")
@requires_sched
def test_setscheduler_with_policy(self):
policy = os.sched_getscheduler(0)
priority = os.sched_get_priority_min(policy)