---
title: feedbackQueue
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtl4commandqueuedescriptor/feedbackqueue
---

# feedbackQueue

Assigns a dispatch queue to which Metal submits feedback notification blocks.

## Declaration

```swift
unowned(unsafe) var feedbackQueue: dispatch_queue_t? { get set }
```

## Discussion

Discussion When you assign a dispatch queue via this method, Metal requires that the queue parameter you provide is a serial queue. If you set the value of property to nil, the default, Metal allocates an internal dispatch queue to service feedback notifications.