Quality-of-service classes that specify the priorities for executing tasks.


enum DispatchQoS.QoSClass


Use quality-of-service classes to communicate the intent behind the work that your app performs. The system uses those intentions to determine the best way to execute your tasks given the available resources. For example, the system gives higher priority to threads containing user-interactive tasks so as to ensure that those tasks are executed quickly. Conversely, it gives lower priority to background tasks, and may attempt to save power by executing them on more power-efficient CPU cores. The system determines how to execute your tasks dynamically based on system conditions and the tasks you schedule.


Quality-of-Service Classes

case userInteractive

The quality-of-service class for user-interactive tasks, such as animations, event handling, or updating your app's user interface.

case userInitiated

The quality-of-service class for tasks that prevent the user from actively using your app.

case `default`

The default quality-of-service class.

case utility

The quality-of-service class for tasks that the user does not track actively.

case background

The quality-of-service class for maintenance or cleanup tasks that you create.

case unspecified

The absence of a quality-of-service class.

Instance Properties

Operator Functions

static func != (DispatchQoS.QoSClass, DispatchQoS.QoSClass) -> Bool

Returns a Boolean value indicating whether two values are not equal.

See Also

Creating a QoS Object

init(qosClass: DispatchQoS.QoSClass, relativePriority: Int)

Creates a new DispatchQoS object with the specified QoS class and relative priority.