Issue #13502: threading: Fix a race condition in Event.wait() that made it

return False when the event was set and cleared right after.

diff --cc Doc/library/threading.rst
Simple merge

diff --cc Lib/test/lock_tests.py
Simple merge

diff --cc Lib/threading.py
Simple merge

diff --cc Misc/NEWS
index 274465a146c57d4c59017fde6655943628d162fb,9212f9e622932792abe2324914ab4bb0a16deacd..05664f67679d95d6e6dc54dfd5143ac84c413c00
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -422,11 -97,9 +422,14 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #13502: threading: Fix a race condition in Event.wait() that made it
+   return False when the event was set and cleared right after.
+ 
 +- Issue #9993: When the source and destination are on different filesystems,
 +  and the source is a symlink, shutil.move() now recreates a symlink on the
 +  destination instead of copying the file contents.  Patch by Jonathan Niehof
 +  and Hynek Schlawack.
 +
  - Issue #12926: Fix a bug in tarfile's link extraction.
  
  - Issue #13696: Fix the 302 Relative URL Redirection problem.