# TaskExecutor An executor that may be used as preferred executor by a task. ``` protocol TaskExecutor : Executor ``` ## Overview ### Impact of setting a task executor preference By default, without setting a task executor preference, nonisolated asynchronous functions, as well as methods declared on default actors – that is actors which do not require a specific executor – execute on Swift’s default global concurrent executor. This is an executor shared by the entire runtime to execute any work which does not have strict executor requirements. By setting a task executor preference, either with a [`withTaskExecutorPreference(_:isolation:operation:)`](/documentation/Swift/withTaskExecutorPreference(_:isolation:operation:)) or creating a task with a preference – using `Task(executorPreference:)` or `group.addTask(executorPreference:)` – the task and all of its child tasks (unless a new preference is set) will be preferring to execute on the provided task executor. Unstructured tasks do not inherit the task executor. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)