184 pub struct Pit {  struct
186     counters: Vec<Arc<Mutex<PitCounter>>>,  argument
190     worker_thread: Option<thread::JoinHandle<PitResult<()>>>,  argument
194 impl Drop for Pit {  implementation
213 impl BusDevice for Pit {  implementation
262 impl Pit {  impl
263     pub fn new(interrupt_evt: Event, clock: Arc<Mutex<Clock>>) -> PitResult<Pit> {  in new()
952     fn write_command(pit: &mut Pit, command: u8) {  in write_command()
957     fn write_speaker(pit: &mut Pit, command: u8) {  in write_speaker()
962     fn write_counter(pit: &mut Pit, counter_idx: usize, data: u16, access_mode: CommandAccess) {  in write_counter()
983     fn read_counter(pit: &mut Pit, counter_idx: usize, expected: u16, access_mode: CommandAccess) {  in read_counter()