Struct calloop::sources::timer::Timer

pub struct Timer {
    registration: Option<Registration>,
    deadline: Option<Instant>,
}

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.

Fields

registration: Option<Registration>

deadline: Option<Instant>

Implementations

impl Timer

pub fn immediate() -> Timer

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

pub fn from_duration(duration: Duration) -> Timer

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

pub fn from_deadline(deadline: Instant) -> Timer

Create a timer that will fire at a given instant

fn from_deadline_inner(deadline: Option<Instant>) -> Timer

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.

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.

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

Get the current deadline of this Timer

Returns None if the timer has overflowed.

Trait Implementations

impl Debug for Timer

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

Formats the value using the given formatter.

impl EventSource for Timer

type Event = Instant

The type of events generated by your source.

type Metadata = ()

Some metadata of your event source

type Ret = TimeoutAction

The return type of the user callback

type Error = Error

The error type returned from process_events() (not the user callback!).

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

fn register( &mut self, poll: &mut Poll, token_factory: &mut TokenFactory, ) -> Result<()>

Register yourself to this poll instance

fn reregister( &mut self, poll: &mut Poll, token_factory: &mut TokenFactory, ) -> Result<()>

Re-register your file descriptors

fn unregister(&mut self, poll: &mut Poll) -> Result<()>

Unregister your file descriptors

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

fn before_sleep(&mut self) -> Result<Option<(Readiness, Token)>>

Notification that a single poll is about to begin

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