Man page - sdl_gettls(3)

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SDL_GetTLS - Get the current thread’s value associated with a thread local storage ID.

Defined in SDL3/SDL_thread.h

#include "SDL3/SDL.h"

void * SDL_GetTLS(SDL_TLSID *id);

a pointer to the thread local storage ID, may not be NULL.

Returns the value associated with the ID for the current thread or NULL if no value has been set; call SDL_GetError () for more information.

It is safe to call this function from any thread.

This function is available since SDL 3.2.0.