diff --git a/Lib/test/test_os.py b/Lib/test/test_os.py
index 5149b0d3884417..1a348bc70bc7cf 100644
--- a/Lib/test/test_os.py
+++ b/Lib/test/test_os.py
@@ -3929,6 +3929,10 @@ def test_eventfd_select(self):
@unittest.skipUnless(hasattr(os, 'timerfd_create'), 'requires os.timerfd_create')
@support.requires_linux_version(2, 6, 30)
class TimerfdTests(unittest.TestCase):
+ # Tolerate a difference of 50 us
+ CLOCK_RES_NS = 50_000
+ CLOCK_RES = CLOCK_RES_NS * 1e-9
+
def timerfd_create(self, *args, **kwargs):
fd = os.timerfd_create(*args, **kwargs)
self.assertGreaterEqual(fd, 0)
@@ -3982,9 +3986,13 @@ def test_timerfd_negative(self):
one_sec_in_nsec = 10**9
fd = self.timerfd_create(time.CLOCK_REALTIME)
+ test_flags = [0, os.TFD_TIMER_ABSTIME]
+ if hasattr(os, 'TFD_TIMER_CANCEL_ON_SET'):
+ test_flags.append(os.TFD_TIMER_ABSTIME | os.TFD_TIMER_CANCEL_ON_SET)
+
# Any of 'initial' and 'interval' is negative value.
for initial, interval in ( (-1, 0), (1, -1), (-1, -1), (-0.1, 0), (1, -0.1), (-0.1, -0.1)):
- for flags in (0, os.TFD_TIMER_ABSTIME, os.TFD_TIMER_ABSTIME|os.TFD_TIMER_CANCEL_ON_SET):
+ for flags in test_flags:
with self.subTest(flags=flags, initial=initial, interval=interval):
with self.assertRaises(OSError) as context:
_, _ = os.timerfd_settime(fd, flags=flags, initial=initial, interval=interval)
@@ -4055,7 +4063,7 @@ def test_timerfd_TFD_TIMER_ABSTIME(self):
t = time.perf_counter() - t
self.assertEqual(count_signaled, 1)
- self.assertGreater(t, offset)
+ self.assertGreater(t, offset - self.CLOCK_RES)
def test_timerfd_select(self):
size = 8 # read 8 bytes
@@ -4208,7 +4216,7 @@ def test_timerfd_ns_TFD_TIMER_ABSTIME(self):
t = time.perf_counter_ns() - t
self.assertEqual(count_signaled, 1)
- self.assertGreater(t, offset_ns)
+ self.assertGreater(t, offset_ns - self.CLOCK_RES_NS)
def test_timerfd_ns_select(self):
size = 8 # read 8 bytes
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