---
name: "SDL_MainThreadCallback"
section: "3type"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_MainThreadCallback"
---

# SDL\_MainThreadCallback(3type)

Callback run on the main thread.

## NAME

SDL\_MainThreadCallback - Callback run on the main thread.

## HEADER FILE

Defined in SDL3/SDL\_init.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**typedef void (SDLCALL \*SDL\_MainThreadCallback)(void \*userdata);**

## FUNCTION PARAMETERS

- *userdata*

  an app-controlled pointer that is passed to the callback.

## AVAILABILITY

This datatype is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_RunOnMainThread**(3)](/SDL_RunOnMainThread/3.md)