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# AudioUnitRenderContext

A structure that contains thread context information for a real-time rendering operation.

```
struct AudioUnitRenderContext;
```

## Overview

When the thread context of a rendering operation changes, the system packages the new rendering context information in an [`AudioUnitRenderContext`](/documentation/AudioToolbox/AudioUnitRenderContext) structure and passes it to the [`AURenderContextObserver`](/documentation/AudioToolbox/AURenderContextObserver) block of any associated Audio Unit app extensions.

## Topics

### Properties

[`workgroup`](/documentation/AudioToolbox/AudioUnitRenderContext/workgroup)

The workgroup that manages the rendering threads of the audio unit.

[`reserved`](/documentation/AudioToolbox/AudioUnitRenderContext/reserved)

System-specific information.


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