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# memoryBarrier(scope:)

Creates a memory barrier that enforces the order of write and read operations for specific resource types.

```
func memoryBarrier(scope: MTLBarrierScope)
```

## Parameters

`scope`

An [`MTLBarrierScope`](/documentation/Metal/MTLBarrierScope) instance that represents the resource types the barrier synchronizes operations on.

## Discussion

Memory barriers ensure the relevant passes finish updating resources before starting the stages of subsequent commands that depend on those resources.

To determine whether a GPU supports memory barriers, see the [Metal feature set tables (PDF)](https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf).

---

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