---
title: isRunning
framework: Core Audio
role: symbol
role_heading: Instance Property
platforms: [macOS 15.0+]
path: coreaudio/audiohardwareclock/isrunning
---

# isRunning

A Bool where a value of false indicates the device is not providing timestamps and a value of true means that it is.

## Declaration

```swift
var isRunning: Bool { get throws }
```

## Discussion

Discussion The notification for this property is usually sent from the device’s IO thread.