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    Dispatch_Global

    Dispatch Global

    Info

    Serial queue
    But background thread.
    Only Main is the main thread which is kept for UI and DispatchQueue.main

    QOS

    Quality Of Service parameter.
    5 different Quality of Service options

    • userInteractive: Used for animations, or updating UI.

    • userInitiated: Used for tasks like loading data from API, preventing the user from making interactions.

    • default : The default quality-of-service class.

    • utility: Used for tasks that do not need to be tracked by the user.

    • background: Used for tasks like saving data in the local database or any maintenance code which is not on high priority.

    • unspecified: The absence of a quality-of-service class.

    UIKit

    DispatchQueue.global().async {
	doSomething()
}

    Combine

    .subscribe(on: DispatchQueue.global())

.receive(on: DispatchQueue.global())

    Source

    https://developer.apple.com/documentation/dispatch/dispatchqos/qosclass

    https://www.swiftpal.io/articles/what-is-qos-quality-of-service-in-gcd-swift