gh-110733: Micro-optimization in BaseEventLoop._run_once (#110735)

bdraco · web-flow · commit 3ac8e6955fed · 2023-10-11T20:59:27.000Z
diff --git a/Lib/asyncio/base_events.py b/Lib/asyncio/base_events.py
@@ -1907,8 +1907,11 @@ def _run_once(self):
             timeout = 0
         elif self._scheduled:
             # Compute the desired timeout.
-            when = self._scheduled[0]._when
-            timeout = min(max(0, when - self.time()), MAXIMUM_SELECT_TIMEOUT)
+            timeout = self._scheduled[0]._when - self.time()
+            if timeout > MAXIMUM_SELECT_TIMEOUT:
+                timeout = MAXIMUM_SELECT_TIMEOUT
+            elif timeout < 0:
+                timeout = 0
 
         event_list = self._selector.select(timeout)
         self._process_events(event_list)
diff --git a/Misc/NEWS.d/next/Library/2023-10-11-18-43-43.gh-issue-110733.UlrgVm.rst b/Misc/NEWS.d/next/Library/2023-10-11-18-43-43.gh-issue-110733.UlrgVm.rst
@@ -0,0 +1 @@
+Micro-optimization: Avoid calling ``min()``, ``max()`` in :meth:`BaseEventLoop._run_once`.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Micro-optimization: Avoid calling ``min()``, ``max()`` in :meth:`BaseEventLoop._run_once`.