Locking an object from being accessed by multiple threads - Objective-C

Question

I have a question regarding thread safety in Objective-C. I\'ve read a couple of other answers, some of the Apple documentation, and still have some doubts regarding this, s

Answer 1

As in Swift 3 in WWDC 2016 Session Session 720 Concurrent Programming With GCD in Swift 3, you should use queue

class MyObject {
  private let internalState: Int
  private let internalQueue: DispatchQueue

  var state: Int {
    get {
      return internalQueue.sync { internalState }
    }

    set (newValue) {
      internalQueue.sync { internalState = newValue }
    }
  }
}