From: Mike Bayer <mike_mp@zzzcomputing.com>
Date: Wed, 19 Feb 2014 21:11:19 +0000 (-0500)
Subject: restore the check ahead of the lock to avoid using it after initialization
X-Git-Tag: rel_0_9_3~8
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8878e2307954a98c894441613b6e836b3982556f;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

restore the check ahead of the lock to avoid using it after initialization
is done
---

diff --git a/lib/sqlalchemy/event/attr.py b/lib/sqlalchemy/event/attr.py
index ca94493f57..a3a0d48dcc 100644
--- a/lib/sqlalchemy/event/attr.py
+++ b/lib/sqlalchemy/event/attr.py
@@ -240,12 +240,13 @@ class _CompoundListener(_HasParentDispatchDescriptor):
         """Execute this event, but only if it has not been
         executed already for this collection."""
 
-        with self._exec_once_mutex:
-            if not self._exec_once:
-                try:
-                    self(*args, **kw)
-                finally:
-                    self._exec_once = True
+        if not self._exec_once:
+            with self._exec_once_mutex:
+                if not self._exec_once:
+                    try:
+                        self(*args, **kw)
+                    finally:
+                        self._exec_once = True
 
     def __call__(self, *args, **kw):
         """Execute this event."""