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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