# memoryBarrierWithResources:count: Creates a memory barrier that enforces the order of write and read operations for specific resources. ``` - (void) memoryBarrierWithResources:(id const[]) resources count:(NSUInteger) count; ``` ## Parameters `resources` A C array of [`MTLResource`](/documentation/Metal/MTLResource) instances the barrier applies to. `count` The number of resources in the array. ## 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). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)