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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