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

# SDL\_CompareAndSwapAtomicPointer(3)

Set a pointer to a new value if it is currently an old value.

## NAME

SDL\_CompareAndSwapAtomicPointer - Set a pointer to a new value if it is currently an old value.

## HEADER FILE

Defined in SDL3/SDL\_atomic.h

## SYNOPSIS

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

**bool SDL\_CompareAndSwapAtomicPointer(void \*\*a, void \*oldval, void \*newval);**

## DESCRIPTION

**Note: If you don't know what this function is for, you shouldn't use** it!

## FUNCTION PARAMETERS

- *a*

  a pointer to a pointer.

- *oldval*

  the old pointer value.

- *newval*

  the new pointer value.

## RETURN VALUE

Returns true if the pointer was set, false otherwise.

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_CompareAndSwapAtomicInt**(3)](/SDL_CompareAndSwapAtomicInt/3.md), **•**(3), [**SDL\_GetAtomicPointer**(3)](/SDL_GetAtomicPointer/3.md), **•**(3), [**SDL\_SetAtomicPointer**(3)](/SDL_SetAtomicPointer/3.md)