async_tick/
lib.rs
1#![cfg_attr(not(feature = "std"), no_std)]
2#![cfg_attr(docsrs, feature(doc_cfg))]
3
4mod interval;
5mod sleep;
6mod timeout;
7mod waiter;
8
9use core::time::Duration;
10use core::u64::MAX;
11pub use interval::*;
12pub use sleep::*;
13pub use timeout::*;
14use waiter::Waiter;
15
16const WAITS_NUM: usize = 64;
17static WAITS: Waiter<WAITS_NUM> = Waiter::new();
18
19pub fn now() -> u64 {
21 tick_clock::now()
22}
23
24pub struct Tick {
25 tick: tick_clock::Tick,
26}
27impl Tick {
28 pub fn tick(&mut self, interval: Duration) -> u64 {
30 let now = self.tick.tick(interval);
31 if let Some(next) = WAITS.take_next() {
32 if now < next {
33 WAITS.set_next(next);
34 return now;
35 }
36 } else {
37 return now;
38 }
39 let mut min = MAX;
40 WAITS.retain(|entity| {
41 if **entity <= now {
42 entity.wake();
43 false
44 } else {
45 min = min.min(**entity);
46 true
47 }
48 });
49 WAITS.set_next(min);
50 now
51 }
52}
53pub fn take_tick() -> Option<Tick> {
54 if let Some(tick) = tick_clock::take_tick() {
55 Some(Tick { tick })
56 } else {
57 None
58 }
59}
60
61#[cfg(feature = "std")]
62#[cfg_attr(docsrs, doc(cfg(feature = "std")))]
63pub fn auto_tick(interval: Duration) {
64 use std::thread;
65 use std::time::Instant;
66
67 let mut ticker = take_tick().unwrap();
68 let mut last = Instant::now();
69 thread::Builder::new()
70 .name("async-tick".into())
71 .spawn(move || loop {
72 let now = Instant::now();
73 ticker.tick(now.saturating_duration_since(last));
74 last = now;
75 thread::sleep(interval);
76 })
77 .unwrap();
78}