https://github.com/python/cpython/commit/97ff57fba3544034b64a513306295174a317e6c7
commit: 97ff57fba3544034b64a513306295174a317e6c7
branch: main
author: Andrew Svetlov <[email protected]>
committer: kumaraditya303 <[email protected]>
date: 2026-11-03T11:51:40+05:30
summary:
gh-161032: Convert BaseEventLoop._clock_resolution to
asyncio.constants.CLOCK_RESOLUTION (#161033)
files:
M Lib/asyncio/base_events.py
M Lib/asyncio/constants.py
M Lib/test/test_asyncio/test_events.py
M Lib/test/test_asyncio/utils.py
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
index 9eb34c5f29fb55..861210775347ae 100644
--- a/Lib/asyncio/base_events.py
+++ b/Lib/asyncio/base_events.py
@@ -432,7 +432,6 @@ def __init__(self):
# Identifier of the thread running the event loop, or None if the
# event loop is not running
self._thread_id = None
- self._clock_resolution = time.get_clock_info('monotonic').resolution
self._exception_handler = None
self.set_debug(coroutines._is_debug_mode())
# The preserved state of async generator hooks.
@@ -2057,7 +2056,7 @@ def _run_once(self):
now = self.time()
# Ensure that `end_time` is strictly increasing
# when the clock resolution is too small.
- end_time = now + max(self._clock_resolution, math.ulp(now))
+ end_time = now + max(constants.CLOCK_RESOLUTION, math.ulp(now))
while self._scheduled:
handle = self._scheduled[0]
if handle._when >= end_time:
diff --git a/Lib/asyncio/constants.py b/Lib/asyncio/constants.py
index b60c1e4236af1f..e0788851e187e7 100644
--- a/Lib/asyncio/constants.py
+++ b/Lib/asyncio/constants.py
@@ -3,6 +3,7 @@
# SPDX-FileCopyrightText: Copyright (c) 2015-2021 MagicStack Inc.
http://magic.io
import enum
+import time
# After the connection is lost, log warnings after this many write()s.
LOG_THRESHOLD_FOR_CONNLOST_WRITES = 5
@@ -33,6 +34,9 @@
# Default timeout for joining the threads in the threadpool
THREAD_JOIN_TIMEOUT = 300
+# Resolution of the clock used by the event loop, in seconds.
+CLOCK_RESOLUTION = time.get_clock_info('monotonic').resolution
+
# The enum should be here to break circular dependencies between
# base_events and sslproto
class _SendfileMode(enum.Enum):
diff --git a/Lib/test/test_asyncio/test_events.py
b/Lib/test/test_asyncio/test_events.py
index 58556cc87409f7..33444c76290b6b 100644
--- a/Lib/test/test_asyncio/test_events.py
+++ b/Lib/test/test_asyncio/test_events.py
@@ -27,6 +27,7 @@
import tty
import asyncio
+from asyncio import constants
from asyncio import coroutines
from asyncio import events
from asyncio import selector_events
@@ -2314,7 +2315,7 @@ async def wait():
# of the clock used by the kernel. Tolerate a few useless calls on
# these platforms.
self.assertLessEqual(self.loop._run_once_counter, 20,
- {'clock_resolution': self.loop._clock_resolution,
+ {'clock_resolution': constants.CLOCK_RESOLUTION,
'selector': self.loop._selector.__class__.__name__})
def test_remove_fds_after_closing(self):
diff --git a/Lib/test/test_asyncio/utils.py b/Lib/test/test_asyncio/utils.py
index e86c221d7f7025..86a2e812b6619e 100644
--- a/Lib/test/test_asyncio/utils.py
+++ b/Lib/test/test_asyncio/utils.py
@@ -360,7 +360,6 @@ def gen():
self._gen = gen()
next(self._gen)
self._time = 0
- self._clock_resolution = 1e-9
self._timers = []
self._selector = TestSelector()
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