SDL_Mutex.3type - Man Page

A means to serialize access to a resource between threads.

Header File

Defined in SDL3/SDL_mutex.h

#include "SDL3/SDL.h"

typedef struct SDL_Mutex SDL_Mutex;

Mutexes (short for "mutual exclusion") are a synchronization primitive that allows exactly one thread to proceed at a time.

Wikipedia has a thorough explanation of the concept:

This struct is available since SDL 3.2.0.

SDL 3.2.2 Simple Directmedia Layer SDL3 DATATYPES