# lock(whenCondition:before:) Attempts to acquire a lock before a specified moment in time. ``` func lock(whenCondition condition: Int, before limit: Date) -> Bool ``` ## Parameters `condition` The condition to match on. `limit` The date by which the lock must be acquired or the attempt will time out. ## Return Value if the lock is acquired within the time limit, otherwise. ## Discussion The receiver’s condition must be equal to `condition` before the locking operation will succeed. This method blocks the thread’s execution until the lock can be acquired or `limit` is reached. --- 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)