6 use std::time::{Duration, Instant};
15 pub type TickToken = Option<Instant>;
20     delivery_time: AtomicCell<Instant>,
31             delivery_time: AtomicCell::new(Instant::now() + dur),  in new()
38     pub fn try_recv(&self) -> Result<Instant, TryRecvError> {  in try_recv()  argument
40             let now = Instant::now();  in try_recv()
59     pub fn recv(&self, deadline: Option<Instant>) -> Result<Instant, RecvTimeoutError> {  in recv()  argument
62             let now = Instant::now();  in recv()
88     pub unsafe fn read(&self, token: &mut Token) -> Result<Instant, ()> {  in read()  argument
95         Instant::now() < self.delivery_time.load()  in is_empty()
138     fn deadline(&self) -> Option<Instant> {  in deadline()  argument