My program is executing out of order, I'm assuming because of some threads finishing before another. NSLock, GDC, suggestions?

Question

From a programming standpoint, because of the way the code is written I can't necessarily work around this.

Basically, in pseudocode:

if NSUserDefaults' stored token exists{

    setFlag(token)
    // setFlag will make an API call with the token and either set Global.variable to true or leave it at false

    if(Global.variable){doThis()}

}

Basically, the condition check happens before the setFlag finishes, so it will never be true at the time of checking. Even if I add a second global boolean along the lines of didSetFlagFinishExecuting, I get the same issue--conditional happens before the others. I put it in a while loop but it was stuck in an infinite loop because of the way I have coded things. I don't have experience with thread locks/ GCD. I prefer not to use it, but I will if I have to. Any suggestions?

EDIT: Actual code

// in viewDidLoad

let defaults = NSUserDefaults.standardUserDefaults()
    if let stringOne = defaults.valueForKey("sessionKey") as? String{
        getStatus(stringOne)
        if(Global.loggedIn){ // do whatever--won't happen

// as an extension to ViewController

func getStatus(sessionKey: String){
    let url :  String = "http://whatever" + sessionKey

    let request : NSMutableURLRequest = NSMutableURLRequest()
    request.URL = NSURL(string: url)
    request.HTTPMethod = "GET"
    var queue : NSOperationQueue = NSOperationQueue()
    var returnString : String = ""

    NSURLConnection.sendAsynchronousRequest(request, queue: queue, completionHandler:{(response:NSURLResponse!, responseData:NSData!, error: NSError!) -> Void in

        if error != nil
        {
            println(error.description)
            returnString = error.description
        }
        else
        {


            var errors: NSError?

            let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(responseData!, options: NSJSONReadingOptions.MutableContainers, error: &errors) as! NSDictionary

            var tempString = jsonData["last_status"] as! String!
            print(tempString)
            if (tempString == "loggedin"){
                Global.loggedIn = true
            }
            Global.finished = true
            print("hello")




          }




        }

    })




}

So if I print Global.loggedIn at the end here, it will be true. It's just none of this finishes in time. Even if I make it a return function, for whatever reason the condition in viewDidLoad will read it as false, THEN "hello" will be printed.

Answer 1

In this line:

if(Global.loggedIn){ // do whatever--won't happen

Take whatever you want to have happen and put it in a function:

func doWhatever() {
    // do whatever
}

Then, in the completion handler closure for your NSURLConnection, change this section of your code by adding one line:

...
if (tempString == "loggedin"){
    Global.loggedIn = true
    doWhatever()            // <--- Add this line
}
...

Give it a try. Let us know if it works. :)