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# DISPATCH_QUEUE_PRIORITY_HIGH

Tasks run at the highest priority, which is equivalent to the user-initiated quality-of-service level.

```
var DISPATCH_QUEUE_PRIORITY_HIGH: Int32 { get }
```

## Discussion

Use quality-of-service constants instead. This constant maps to the `QOS_CLASS_USER_INITIATED` class.

Items dispatched to the queue run at high priority; the queue is scheduled for execution before any default priority or low priority queue.

---

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