---
title: beforeSources
framework: corefoundation
role: symbol
role_heading: Type Property
path: corefoundation/cfrunloopactivity/beforesources
---

# beforeSources

Inside the event processing loop before any sources are processed.

## Declaration

```swift
static var beforeSources: CFRunLoopActivity { get }
```

## See Also

### Constants

- [entry](corefoundation/cfrunloopactivity/entry.md)
- [beforeTimers](corefoundation/cfrunloopactivity/beforetimers.md)
- [beforeWaiting](corefoundation/cfrunloopactivity/beforewaiting.md)
- [afterWaiting](corefoundation/cfrunloopactivity/afterwaiting.md)
- [exit](corefoundation/cfrunloopactivity/exit.md)
- [allActivities](corefoundation/cfrunloopactivity/allactivities.md)