document threading.Lock.locked() (GH-17427)

miss-islington · idomic · web-flow · commit d300c0e845cd · 2019-12-01T12:14:26.000-08:00
(cherry picked from commit fdafa1d) Co-authored-by: idomic <michael.ido@gmail.com>
diff --git a/Doc/library/threading.rst b/Doc/library/threading.rst
@@ -488,6 +488,10 @@ All methods are executed atomically.
 
       There is no return value.
 
+   .. method:: locked()
+      Return true if the lock is acquired.
+
+
 
 .. _rlock-objects:
 
