---
title: concurrent
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/nssortoptions/concurrent
---

# concurrent

Specifies that the Block sort operation should be concurrent.

## Declaration

```swift
static var concurrent: NSSortOptions { get }
```

## Discussion

Discussion This option is a hint and may be ignored by the implementation under some circumstances; the code of the Block must be safe against concurrent invocation.

## See Also

### Constants

- [stable](foundation/nssortoptions/stable.md)