SDL_InitStatus.3type - Man Page

#include <SDL3/SDL_mutex.h>

typedef enum SDL_InitStatus
{
    SDL_INIT_STATUS_UNINITIALIZED,
    SDL_INIT_STATUS_INITIALIZING,
    SDL_INIT_STATUS_INITIALIZED,
    SDL_INIT_STATUS_UNINITIALIZING
} SDL_InitStatus;

This enum is available since SDL 3.2.0.