SDL_TLSID SDL_TLSCreate(void)

static SDL_SpinLock tls_lock;
static SDL_TLSID thread_local_storage;

void SetMyThreadData(void *value)
{
    if (!thread_local_storage)
    {
        SDL_AtomicLock(&tls_lock);
        if (!thread_local_storage)
        {
            thread_local_storage = SDL_TLSCreate();
        }
        SDL_AtomicUnlock(&tls_lock);
    }
    SDL_TLSSet(thread_local_storage, value, 0);
}

void *GetMyThreadData(void)
{
    return SDL_TLSGet(thread_local_storage);
}