---
title: kCVReturnDisplayLinkAlreadyRunning
framework: corevideo
role: symbol
role_heading: Global Variable
path: corevideo/kcvreturndisplaylinkalreadyrunning
---

# kCVReturnDisplayLinkAlreadyRunning

The specified display link is already running.

## Declaration

```swift
var kCVReturnDisplayLinkAlreadyRunning: CVReturn { get }
```

## See Also

### Display Link

- [kCVReturnInvalidDisplay](corevideo/kcvreturninvaliddisplay.md)
- [kCVReturnDisplayLinkNotRunning](corevideo/kcvreturndisplaylinknotrunning.md)
- [kCVReturnDisplayLinkCallbacksNotSet](corevideo/kcvreturndisplaylinkcallbacksnotset.md)