kingst

let dictLock = DispatchSemaphore(value: 1)
var originSemaphores: [String: DispatchSemaphore] = [:]

// make a non blocking HTTP request
func makeHttpRequest(url: String, origin: String, complete: @escaping (() -> Void)) {
    dictLock.wait()
    if originSemaphores[origin] == nil {
        originSemaphores[origin] = DispatchSemaphore(value: 2)
    }
    let semaphore = originSemaphores[origin]!