Struct tokio::time::Interval

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pub struct Interval { /* private fields */ }
Expand description

Interval returned by interval and interval_at.

This type allows you to wait on a sequence of instants with a certain duration between each instant. Unlike calling sleep in a loop, this lets you count the time spent between the calls to sleep as well.

An Interval can be turned into a Stream with IntervalStream.

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impl Interval

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pub async fn tick(&mut self) -> Instant

Completes when the next instant in the interval has been reached.

Cancel safety

This method is cancellation safe. If tick is used as the branch in a tokio::select! and another branch completes first, then no tick has been consumed.

Examples
use tokio::time;

use std::time::Duration;

#[tokio::main]
async fn main() {
    let mut interval = time::interval(Duration::from_millis(10));

    interval.tick().await;
    // approximately 0ms have elapsed. The first tick completes immediately.
    interval.tick().await;
    interval.tick().await;

    // approximately 20ms have elapsed.
}
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pub fn poll_tick(&mut self, cx: &mut Context<'_>) -> Poll<Instant>

Polls for the next instant in the interval to be reached.

This method can return the following values:

  • Poll::Pending if the next instant has not yet been reached.
  • Poll::Ready(instant) if the next instant has been reached.

When this method returns Poll::Pending, the current task is scheduled to receive a wakeup when the instant has elapsed. Note that on multiple calls to poll_tick, only the Waker from the Context passed to the most recent call is scheduled to receive a wakeup.

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pub fn reset(&mut self)

Resets the interval to complete one period after the current time.

This method ignores MissedTickBehavior strategy.

Examples
use tokio::time;

use std::time::Duration;

#[tokio::main]
async fn main() {
    let mut interval = time::interval(Duration::from_millis(100));

    interval.tick().await;

    time::sleep(Duration::from_millis(50)).await;
    interval.reset();

    interval.tick().await;
    interval.tick().await;

    // approximately 250ms have elapsed.
}
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pub fn missed_tick_behavior(&self) -> MissedTickBehavior

Returns the MissedTickBehavior strategy currently being used.

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pub fn set_missed_tick_behavior(&mut self, behavior: MissedTickBehavior)

Sets the MissedTickBehavior strategy that should be used.

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pub fn period(&self) -> Duration

Returns the period of the interval.

Trait Implementations§

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impl Debug for Interval

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.