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This is in preperation for core integration.
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license. | ||
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//! This module helps deno implement timers. | ||
//! | ||
//! As an optimization, we want to avoid an expensive calls into rust for every | ||
//! setTimeout in JavaScript. Thus in //js/timers.ts a data structure is | ||
//! implemented that calls into Rust for only the smallest timeout. Thus we | ||
//! only need to be able to start and cancel a single timer (or Delay, as Tokio | ||
//! calls it) for an entire Isolate. This is what is implemented here. | ||
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use crate::tokio_util::panic_on_error; | ||
use futures::Future; | ||
use std::time::Instant; | ||
use tokio::sync::oneshot; | ||
use tokio::timer::Delay; | ||
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pub struct GlobalTimer { | ||
tx: Option<oneshot::Sender<()>>, | ||
} | ||
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impl GlobalTimer { | ||
pub fn new() -> Self { | ||
Self { tx: None } | ||
} | ||
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pub fn cancel(&mut self) { | ||
if let Some(tx) = self.tx.take() { | ||
tx.send(()).ok(); | ||
} | ||
} | ||
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pub fn new_timeout( | ||
&mut self, | ||
deadline: Instant, | ||
) -> impl Future<Item = (), Error = ()> { | ||
if self.tx.is_some() { | ||
self.cancel(); | ||
} | ||
assert!(self.tx.is_none()); | ||
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let (tx, rx) = oneshot::channel(); | ||
self.tx = Some(tx); | ||
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let delay = panic_on_error(Delay::new(deadline)); | ||
let rx = panic_on_error(rx); | ||
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delay.select(rx).then(|_| Ok(())) | ||
} | ||
} |
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