[swift-users] Swift 3 equivalent of dispatch_barrier_async

[Eric Miller]

I tried searching github's swift-evolution for "dispatch_barrier_async",
but don't see a mention of it.

Can I migrate this directly to swift 3, or do I need a larger refactor
involving serial queues?

```swift

let myConcurrentQueue = DispatchQueue(label: "concurrentQ", attributes: .
concurrent)
dispatch_barrier_async(myConcurrentQueue) { ... }

```
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