---
title: "CMTimebaseNotificationBarrier(_:)"
framework: coremedia
role: symbol
role_heading: Function
path: "coremedia/cmtimebasenotificationbarrier(_:)"
---

# CMTimebaseNotificationBarrier(_:)

Requests that the timebase wait until it isn’t posting notifications.

## Declaration

```swift
func CMTimebaseNotificationBarrier(_ timebase: CMTimebase) -> OSStatus
```