---
title: qualityOfService
framework: foundation
role: symbol
role_heading: Instance Property
path: foundation/thread/qualityofservice
---

# qualityOfService

## Declaration

```swift
var qualityOfService: QualityOfService { get set }
```

## See Also

### Prioritizing Thread Work

- [QualityOfService](foundation/qualityofservice.md)
- [threadPriority()](foundation/thread/threadpriority().md)
- [threadPriority](foundation/thread/threadpriority.md)
- [setThreadPriority(_:)](foundation/thread/setthreadpriority(_:).md)