Issue #20452: select and selectors round (again) timeout away from zero for
poll and epoll
Improve also debug info to analyze the issue
diff --git a/Lib/selectors.py b/Lib/selectors.py
index b1b530a..52ee8db 100644
--- a/Lib/selectors.py
+++ b/Lib/selectors.py
@@ -8,6 +8,7 @@
from abc import ABCMeta, abstractmethod, abstractproperty
from collections import namedtuple, Mapping
import functools
+import math
import select
import sys
@@ -369,8 +370,9 @@
elif timeout <= 0:
timeout = 0
else:
- # Round towards zero
- timeout = int(timeout * 1000)
+ # poll() has a resolution of 1 millisecond, round away from
+ # zero to wait *at least* timeout seconds.
+ timeout = int(math.ceil(timeout * 1e3))
ready = []
try:
fd_event_list = self._poll.poll(timeout)
@@ -430,6 +432,10 @@
timeout = -1
elif timeout <= 0:
timeout = 0
+ else:
+ # epoll_wait() has a resolution of 1 millisecond, round away
+ # from zero to wait *at least* timeout seconds.
+ timeout = math.ceil(timeout * 1e3) * 1e-3
max_ev = len(self._fd_to_key)
ready = []
try: