amazonwebservices/aws-sdk-for-ios — pull request #9 by WillerZ (2012-09-09 19:57:42+00:00)
Title: Fix a serialisation error

You cannot use @synchronized(A) when A is nil; in the sections of code I corrected A is guaranteed to be nil in at least one thread, leading to concurrent execution of the supposedly synchronized block. I have corrected this.