# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2010-08-21 23:19:45 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/21784678300) Does anyone have experience with Multi-Threaded, Core Data iPhone Dev? And want to help me out tomorrow. Trying to use NSLock but :( so far