# performAndWait(_:) Executes the provided closure on the coordinator’s queue and waits for it to finish. ``` @preconcurrency func performAndWait(_ block: @Sendable () throws -> T) rethrows -> T ``` ## Parameters `block` The closure to execute. --- 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)