BackgroundViewController.swift

//
//  ViewController.swift
//  BackgroundExample
//
//  Created by Calo, Ignazio on 16.11.18.
//  Copyright © 2018 eBay Kleinanzeigen. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let myDataQueue = DispatchQueue(label: "DataQueue", qos: .userInitiated, attributes: .concurrent, autoreleaseFrequency: .workItem, target: nil)

        var datapoints1 = [Int]()
        var datapoints2 = [Int]()

        let start1 = Date()

        for i in 1...50000 {
            myDataQueue.async(flags: .barrier) {
                datapoints1.append(i)
                if datapoints1.count == 50000 {
                    print("Asynch completed in \(Date().timeIntervalSince(start1))")
                }
            }
        }

        let end1 = Date()
        print("Concurrent background Queue takes \(end1.timeIntervalSince(start1)) to create all the tasks")



        let start2 = Date()
        for i in 1...50000 {
            datapoints2.append(i)
        }

        let end2 = Date()
        print("Main Queue takes \(end2.timeIntervalSince(start2))")
    }
}