stig/json-framework — pull request #140 by AlenZhou (2012-07-30 08:43:01+00:00)
Title: Make SINGLETON thread safe

Original SINGLETON in SBJsonStreamParserState.m & SBJsonStreamWriterState.m is not thread safe, when we use SBJSON concurrently, our app sometimes crashed while sending message to state, because state is dealloced.