         super.init(queue: queue)
     }
     
+    /**:name: Barriers */
     
     /**
         Dispatches a barrier block asynchronously on this queue. This method will return immediately.

        dispatch_barrier_sync(queue, block)
    }
    
    
    /**
        Executes the block on this queue for number of iterations passed to it. The block may execute for

            group.notify(completionBlock)
        }
    }
    
    /**:name: Map operations */
    
    /**
        Executes the mapping block concurrently for each element in array. This method will wait for all
