Issue #20505: Add debug info to analyze sporaric failures of
test_timeout_rounding() on Windows XP buildbots.
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 558406c..4207a7e 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -633,7 +633,13 @@
else:
logger.log(level, 'poll took %.3f seconds', t1-t0)
else:
+ t0 = self.time()
event_list = self._selector.select(timeout)
+ dt = self.time() - t0
+ if not event_list and timeout and dt < timeout:
+ print("asyncio: selector.select(%.3f ms) took %.3f ms"
+ % (timeout*1e3, dt*1e3),
+ file=sys.__stderr__, flush=True)
self._process_events(event_list)
# Handle 'later' callbacks that are ready.