[−][src]Struct smol::Timer
Fires at the chosen point in time.
Timers are futures that output the Instant
at which they fired.
Examples
Sleep for 1 second:
use smol::Timer; use std::time::Duration; async fn sleep(dur: Duration) { Timer::after(dur).await; } sleep(Duration::from_secs(1)).await;
Set a timeout on an I/O operation:
use futures::future::Either; use futures::io::{self, BufReader}; use futures::prelude::*; use smol::Timer; use std::time::Duration; async fn timeout<T>( dur: Duration, f: impl Future<Output = io::Result<T>>, ) -> io::Result<T> { futures::pin_mut!(f); match future::select(f, Timer::after(dur)).await { Either::Left((out, _)) => out, Either::Right(_) => Err(io::ErrorKind::TimedOut.into()), } } // Create a buffered stdin reader. let mut stdin = BufReader::new(smol::reader(std::io::stdin())); // Read a line within 5 seconds. let mut line = String::new(); timeout(Duration::from_secs(5), stdin.read_line(&mut line)).await?;
Implementations
impl Timer
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pub fn after(dur: Duration) -> Timer
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Fires after the specified duration of time.
Examples
use smol::Timer; use std::time::Duration; Timer::after(Duration::from_secs(1)).await;
pub fn at(when: Instant) -> Timer
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Fires at the specified instant in time.
Examples
use smol::Timer; use std::time::{Duration, Instant}; let now = Instant::now(); let when = now + Duration::from_secs(1); Timer::at(when).await;
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for Timer
impl Send for Timer
impl Sync for Timer
impl Unpin for Timer
impl UnwindSafe for Timer
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T> FutureExt for T where
T: Future + ?Sized,
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T: Future + ?Sized,
fn map<U, F>(self, f: F) -> Map<Self, F> where
F: FnOnce(Self::Output) -> U,
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F: FnOnce(Self::Output) -> U,
fn map_into<U>(self) -> MapInto<Self, U> where
Self::Output: Into<U>,
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Self::Output: Into<U>,
fn then<Fut, F>(self, f: F) -> Then<Self, Fut, F> where
F: FnOnce(Self::Output) -> Fut,
Fut: Future,
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F: FnOnce(Self::Output) -> Fut,
Fut: Future,
fn left_future<B>(self) -> Either<Self, B> where
B: Future<Output = Self::Output>,
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B: Future<Output = Self::Output>,
fn right_future<A>(self) -> Either<A, Self> where
A: Future<Output = Self::Output>,
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A: Future<Output = Self::Output>,
fn into_stream(self) -> IntoStream<Self>
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fn flatten(self) -> Flatten<Self> where
Self::Output: Future,
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Self::Output: Future,
fn flatten_stream(self) -> FlattenStream<Self> where
Self::Output: Stream,
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Self::Output: Stream,
fn fuse(self) -> Fuse<Self>
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fn inspect<F>(self, f: F) -> Inspect<Self, F> where
F: FnOnce(&Self::Output),
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F: FnOnce(&Self::Output),
fn catch_unwind(self) -> CatchUnwind<Self> where
Self: UnwindSafe,
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Self: UnwindSafe,
fn shared(self) -> Shared<Self> where
Self::Output: Clone,
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Self::Output: Clone,
fn remote_handle(self) -> (Remote<Self>, RemoteHandle<Self::Output>)
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fn boxed<'a>(self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a + Send>> where
Self: Send + 'a,
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Self: Send + 'a,
fn boxed_local<'a>(self) -> Pin<Box<dyn Future<Output = Self::Output> + 'a>> where
Self: 'a,
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Self: 'a,
fn unit_error(self) -> UnitError<Self>
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fn never_error(self) -> NeverError<Self>
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fn poll_unpin(&mut self, cx: &mut Context) -> Poll<Self::Output> where
Self: Unpin,
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Self: Unpin,
fn now_or_never(self) -> Option<Self::Output>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<F> IntoFuture for F where
F: Future,
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F: Future,
type Output = <F as Future>::Output
🔬 This is a nightly-only experimental API. (
into_future
)The output that the future will produce on completion.
type Future = F
🔬 This is a nightly-only experimental API. (
into_future
)Which kind of future are we turning this into?
fn into_future(self) -> <F as IntoFuture>::Future
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,