About oneway void

In XCode 4.2 (with LLVM): In-(void) release {}, the warning: Semantic Issue is displayed: conflicting distributed object modifiers on return type in implementation of 'release' to remove the warning, modify the following:-(oneway void) release {} oneway is used with the distributed objects API, which allows use of objective-c objects between different threads or applications. it tells the system that it shocould not block the calling thread until the method returns. without it, the caller will block, even though the method's return type is void. obviusly, it is never used with anything other than void, as doing so wocould mean the method returns something, but the caller doesn' t get it.