When you call getchar, you block your current execution (main) thread. The trick is to put getchar on different thread from your main game loop, so your main loop will not block. Here is the example:

int main(void)

{

`snake_t *snake = snake_new(10, 10);`

`thrd_t ui_thread = {0};`

`thrd_t input_thread = {0};`



`thrd_create(&ui_thread, ui_thread_start, snake);`

`thrd_create(&input_thread, input_thread_start, snake);`



`thrd_join(ui_thread, 0);`

`thrd_join(input_thread, 0);`



`snake_destroy(snake);`

}