---
title: AtomicUpdateOrdering
framework: synchronization
role: symbol
role_heading: Structure
path: synchronization/atomicupdateordering
---

# AtomicUpdateOrdering

Specifies the memory ordering semantics of an atomic read-modify-write operation.

## Declaration

```swift
@frozen struct AtomicUpdateOrdering
```

## Topics

### Type Properties

- [acquiring](synchronization/atomicupdateordering/acquiring.md)
- [acquiringAndReleasing](synchronization/atomicupdateordering/acquiringandreleasing.md)
- [relaxed](synchronization/atomicupdateordering/relaxed.md)
- [releasing](synchronization/atomicupdateordering/releasing.md)
- [sequentiallyConsistent](synchronization/atomicupdateordering/sequentiallyconsistent.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Copyable](swift/copyable.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Escapable](swift/escapable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Memory Ordering Semantics

- [AtomicLoadOrdering](synchronization/atomicloadordering.md)
- [AtomicStoreOrdering](synchronization/atomicstoreordering.md)
- [atomicMemoryFence(ordering:)](synchronization/atomicmemoryfence(ordering:).md)