Thread queue in Swift

Question

When user click at button i perform 15 background tasks with some function:

let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
dispatch_async(dispatch_get_global_queue(priority, 0)) {
    myfunc()
}

So i have tested this on my phone, and when i click on button couple times, i got a lot of threads and phone lagged for a minute...

So do i need create Array with task queue and for example limit number of threads to 5 or 10 or swift has standard instruments for this ?

Answer 1

Thanks for comments, this is works:

let backgroundQueue = NSOperationQueue()
backgroundQueue.maxConcurrentOperationCount = 5
for i in 0...100 {
   backgroundQueue.addOperationWithBlock(){
       self.somefunc()
  }
}