---
title: BLAS_THREADING
framework: accelerate
role: symbol
role_heading: Structure
path: accelerate/blas_threading
---

# BLAS_THREADING

Constants that describe the BLAS and LAPACK threading model.

## Declaration

```swift
struct BLAS_THREADING
```

## Overview

Overview Use the threading model constants to specify whether BLAS and LAPACK operations run in a single thread or multiple threads. Specify the single-threaded model if your app uses its own threading mechanism.

## Topics

### Specifying a threading model

- [init(_:)](accelerate/blas_threading/init(_:).md)
- [init(rawValue:)](accelerate/blas_threading/init(rawvalue:).md)
- [rawValue](accelerate/blas_threading/rawvalue.md)
- [BLAS_THREADING_MULTI_THREADED](accelerate/blas_threading_multi_threaded.md)
- [BLAS_THREADING_SINGLE_THREADED](accelerate/blas_threading_single_threaded.md)
- [BLAS_THREADING_MAX_OPTIONS](accelerate/blas_threading_max_options.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [RawRepresentable](swift/rawrepresentable.md)
- [Sendable](swift/sendable.md)

## See Also

### Specifying the threading model

- [BLAS](accelerate/blas.md)
- [BLASSetThreading(_:)](accelerate/blassetthreading(_:).md)
- [BLASGetThreading()](accelerate/blasgetthreading().md)