# threadId

> Persistent identifier associated with the thread.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor.Profiling](/engine/6000.6/script-reference/unityeditor/profiling.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public ulong threadId { get; }
```

### Remarks

The *threadId* is unique and persists across frames.