dem_applez

//
//  ViewController.swift
//  test
//
//  Created by enat on 27/06/16.
//  Copyright © 2016 enat. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    private let queue = dispatch_queue_create(
        "queue", DISPATCH_QUEUE_SERIAL)
    private let queue2 = dispatch_queue_create(
        "queue1", DISPATCH_QUEUE_CONCURRENT)
    private let queue3 = dispatch_queue_create(
        "queue2", DISPATCH_QUEUE_CONCURRENT)
    //private let lock = NSLock()
    let group = dispatch_group_create()
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        lock.lock()
        dispatch_group_enter(self.group)
        dispatch_async(queue, {
            self.asyncCall("1")

        })
        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)
        dispatch_group_enter(self.group)

        dispatch_async(queue, {
            self.asyncCall("2")

        })
        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)
        dispatch_group_enter(self.group)

        dispatch_async(queue, {
            self.asyncCall("3")

        })
        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)
        dispatch_group_enter(self.group)

        dispatch_async(queue, {
            self.asyncCall("4")

        })
        dispatch_group_wait(group, DISPATCH_TIME_FOREVER)
        dispatch_group_enter(self.group)

        lock.unlock();
        asyncCall("Main");
    }

    func asyncCall(test:String){
        //lock.lock()
        print(test)
        dispatch_async(queue2, {
            print( test)
            dispatch_async(self.queue3, {
                print(test)
                
                //self.lock.unlock()
                dispatch_group_leave(self.group)
                })
        })
        
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}