Semaphore based NSURLSession for Command Line GeoCoder

geocoder.swift

import Foundation

func BlockingGet(url:String)->String?{
    let sema=dispatch_semaphore_create(0)
    let url:NSURL!=NSURL(string:url)
    var output:String?
    NSURLSession.sharedSession().dataTaskWithURL(url) {
        data, response, error in
            output = NSString(data: data!, encoding: NSUTF8StringEncoding) as String?
            dispatch_semaphore_signal(sema)
        }!.resume()
    dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER)
    return output
}


let url="http://maps.googleapis.com/maps/api/geocode/json?address=1%20University%20Plaza,%2011021"

print(BlockingGet(url)!)

print("Done")