From 3e7cc03f63755e2e719fa46aff9b94f648a8f68b Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Fri, 7 Feb 2014 17:53:13 +0100
Subject: [PATCH] Issue #20505: add debug info
---
Lib/asyncio/base_events.py | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index cafd10a06e..b9de8c719a 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -634,7 +634,17 @@ class BaseEventLoop(events.AbstractEventLoop):
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 timeout and not event_list and dt < timeout:
+ print("%s.select(%.3f ms) took %.3f ms (granularity=%.3f ms, resolution=%.3f ms)"
+ % (self._selector.__class__.__name__,
+ timeout * 1e3,
+ dt * 1e3,
+ self._granularity * 1e3,
+ self._selector.resolution * 1e3),
+ file=sys.__stderr__)
self._process_events(event_list)
# Handle 'later' callbacks that are ready.
--
2.40.0