Global Variable

DISPATCH_QUEUE_PRIORITY_BACKGROUND

Declaration

var DISPATCH_QUEUE_PRIORITY_BACKGROUND: Int32 { get }

Discussion

Items dispatched to the queue run at background priority; the queue is scheduled for execution after all high priority queues have been scheduled and the system runs items on a thread whose priority is set for background status. Such a thread has the lowest priority and any disk I/O is throttled to minimize the impact on the system.

This constant maps to the QOS_CLASS_BACKGROUND class.