You might be looking for the DispatchQoS.QoSClass 
<https://developer.apple.com/reference/dispatch/dispatchqos.qosclass> enum.

Saagar Jha



> On Sep 25, 2016, at 05:19, Gerriet M. Denkmann via swift-users 
> <swift-users@swift.org> wrote:
> 
> In ObjC:
> 
> dispatch_queue_t queue = dispatch_get_global_queue( 
> DISPATCH_QUEUE_PRIORITY_HIGH, 0 );                
> dispatch_apply( nbrThreads, queue, ^void(size_t idx) …
> 
> In Swift 3:
> DispatchQueue.concurrentPerform( iterations: nbrThreads) …
> 
> How can one specify the DISPATCH_QUEUE_PRIORITY or QualityOfService to be 
> used by concurrentPerform?
> 
> Gerriet.
> 
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