---
title: "withLock(_:)"
framework: os
role: symbol
role_heading: Instance Method
path: "os/osallocatedunfairlock/withlock(_:)-1uy7m"
---

# withLock(_:)

## Declaration

```swift
func withLock<R>(_ body: @Sendable (inout State) throws -> R) rethrows -> R where R : Sendable
```