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Swift actors provide data‑race safety via isolation. Cross‑actor access is to immutable value lets or via async calls you await. Scheduling may reorder calls. Actors are reentrant—state may change between awaits; recheck invariants or guard critical sections.

How Do You Build a Mutex That Works with async/await ?

Actors reenter and Mutex can’t span awaits. TaskGate’s AsyncGate builds an async critical section by guarding gate state with NSLock and parking waiters via withCheckedContinuation, then handing off ownership. It forwards task priority escalation. Caveat: reentry deadlocks—use AsyncRecursiveGate.

Actors in Swift: The Problem They Solve and How it Works

How Do You Build a Mutex That Works with async/await ?

Actors in Swift: The Problem They Solve and How it Works

How Do You Build a Mutex That Works with async/await ?