###### (This is the legacy documentation for stable SDL2, the current stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current development version.)
# SDL_ThreadID

Get the thread identifier for the current thread.

## Header File

Defined in [SDL_thread.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_thread.h), but apps should _only_ `#include "SDL.h"`!

## Syntax

```c
SDL_threadID SDL_ThreadID(void);

```

## Return Value

Returns the ID of the current thread.

## Remarks

This thread identifier is as reported by the underlying operating system.
If SDL is running on a platform that does not support threads the return
value will always be zero.

This function also returns a valid thread ID when called from the main
thread.

## Version

This function is available since SDL 2.0.0.

## See Also

* [SDL_GetThreadID](SDL_GetThreadID)

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[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction)