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import Foundation

func downloadSync(path: String) -> (Data?, URLResponse?, Error?) {
    var result: (Data?, URLResponse?, Error?)! = nil
    let semaphore = DispatchSemaphore(value: 0)
    let url = URL(string: path)!
    let request = URLRequest(url: url)
    URLSession.shared.dataTask(with: request) { data, response, error in
        result = (data, response, error)
        semaphore.signal()
    }.resume()
    semaphore.wait()
    return result
}

let paths = ["http://qiita.com/mono0926/items/c32c008384df40bf4e41",
             "http://qiita.com/mono0926/items/acef5cb3651620a355c3",
             "http://qiita.com/mono0926/items/139014be6c15e32b9696"]
DispatchQueue.concurrentPerform(iterations: paths.count) { i in
    let r = downloadSync(path: paths[i])
    print(String(data: r.0!, encoding: .utf8))
}