Struct calloop::timer::Timer

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

A timer event source

When registered to the event loop, it will trigger an event once its deadline is reached. If the deadline is in the past relative to the moment of its insertion in the event loop, the TImer will trigger an event as soon as the event loop is dispatched.

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impl Timer

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pub fn immediate() -> Timer

Create a timer that will fire immediately when inserted in the event loop

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pub fn from_duration(duration: Duration) -> Timer

Create a timer that will fire after a given duration from now

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pub fn from_deadline(deadline: Instant) -> Timer

Create a timer that will fire at a given instant

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pub fn set_deadline(&mut self, deadline: Instant)

Changes the deadline of this timer to an Instant

If the Timer is currently registered in the event loop, it needs to be re-registered for this change to take effect.

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pub fn set_duration(&mut self, duration: Duration)

Changes the deadline of this timer to a Duration from now

If the Timer is currently registered in the event loop, it needs to be re-registered for this change to take effect.

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pub fn current_deadline(&self) -> Option<Instant>

Get the current deadline of this Timer

Returns None if the timer has overflowed.

Trait Implementations§

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impl Debug for Timer

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

Formats the value using the given formatter. Read more
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impl EventSource for Timer

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type Event = Instant

The type of events generated by your source.
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type Metadata = ()

Some metadata of your event source Read more
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type Ret = TimeoutAction

The return type of the user callback Read more
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type Error = Error

The error type returned from process_events() (not the user callback!).
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fn process_events<F>( &mut self, _: Readiness, token: Token, callback: F, ) -> Result<PostAction, Self::Error>
where F: FnMut(Self::Event, &mut Self::Metadata) -> Self::Ret,

Process any relevant events Read more
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fn register( &mut self, poll: &mut Poll, token_factory: &mut TokenFactory, ) -> Result<()>

Register yourself to this poll instance Read more
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fn reregister( &mut self, poll: &mut Poll, token_factory: &mut TokenFactory, ) -> Result<()>

Re-register your file descriptors Read more
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fn unregister(&mut self, poll: &mut Poll) -> Result<()>

Unregister your file descriptors Read more
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const NEEDS_EXTRA_LIFECYCLE_EVENTS: bool = false

Whether this source needs to be sent the EventSource::before_sleep and EventSource::before_handle_events notifications. These are opt-in because they require more expensive checks, and almost all sources will not need these notifications
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fn before_sleep(&mut self) -> Result<Option<(Readiness, Token)>>

Notification that a single poll is about to begin Read more
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fn before_handle_events(&mut self, events: EventIterator<'_>)

Notification that polling is complete, and EventSource::process_events will be called with the given events for this source. The iterator may be empty, which indicates that no events were generated for this source Read more

Auto Trait Implementations§

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impl Freeze for Timer

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impl !RefUnwindSafe for Timer

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impl !Send for Timer

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impl !Sync for Timer

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impl Unpin for Timer

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impl !UnwindSafe for Timer

Blanket 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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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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.
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more