[1.0.X] Fixed #9644: fix a thread sync issue in the locmem cache. Thanks,...

[1.0.X] Fixed #9644: fix a thread sync issue in the locmem cache. Thanks, mrts. Backport of r10333 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@10334 bcc190cf-cafb-0310-a4f2-bffc1f526a37