gistfile1.swift

let key = "A-Recursive-Key"

public class Test {
    let updateQueue:dispatch_queue_t
    
    init() {
        self.updateQueue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_CONCURRENT)
        
        withUnsafePointer(&self.updateQueue) { unsafePointer in
            dispatch_queue_set_specific(self.updateQueue, key, unsafePointer, nil)
        }
    }
    
    
    private func dispatch_sync_recursive(block:() -> ()) -> () {
        withUnsafePointer(&self.updateQueue) { unsafePointer in
            dispatch_queue_set_specific(self.updateQueue, key, unsafePointer, nil)
        }
    }
    
}