---
name: "SDL_UnlockMutex"
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_UnlockMutex"
---

# SDL\_UnlockMutex(3)

Unlock the mutex.

## NAME

SDL\_UnlockMutex - Unlock the mutex.

## HEADER FILE

Defined in SDL3/SDL\_mutex.h

## SYNOPSIS

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

**void SDL\_UnlockMutex(SDL\_Mutex \*mutex);**

## DESCRIPTION

It is legal for the owning thread to lock an already-locked mutex. It must unlock it the same number of times before it is actually made available for other threads in the system (this is known as a "recursive mutex").

It is illegal to unlock a mutex that has not been locked by the current thread, and doing so results in undefined behavior.

## FUNCTION PARAMETERS

- *mutex*

  the mutex to unlock.

## AVAILABILITY

This function is available since SDL 3.2.0.

## SEE ALSO

**•**(3), [**SDL\_LockMutex**(3)](/SDL_LockMutex/3.md), **•**(3), [**SDL\_TryLockMutex**(3)](/SDL_TryLockMutex/3.md)