From c8ab6eeb01ef01d8a630cbf177b06cece326be54 Mon Sep 17 00:00:00 2001
From: Vinay Sajip <vinay_sajip@yahoo.co.uk>
Date: Tue, 8 Mar 2011 22:49:57 +0000
Subject: Issue #11444: Lock handlers while flushing/closing during shutdown.

---
 Lib/logging/__init__.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index b555bbe..685efeb 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -1507,12 +1507,15 @@ def shutdown(handlerList=_handlerList):
         #errors might occur, for example, if files are locked
         #we just ignore them if raiseExceptions is not set
         try:
+            h.acquire()
             h.flush()
             h.close()
         except:
             if raiseExceptions:
                 raise
             #else, swallow
+        finally:
+            h.release()
 
 #Let's try and shutdown automatically on application exit...
 try:
-- 
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