# Struct alloc::task::Waker[−][src]

    #[repr(transparent)]
    pub struct Waker { /* fields omitted */ }

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

A `Waker` is a handle for waking up a task by notifying its executor that it is ready to be run.

This handle contains a trait object pointing to an instance of the `UnsafeWake` trait, allowing notifications to get routed through it.

## Methods

###

`impl Waker`

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####

`pub unsafe fn new(inner: NonNull<UnsafeWake + 'static>) -> Waker`

[src]

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

Constructs a new `Waker` directly.

Note that most code will not need to call this. Implementers of the `UnsafeWake` trait will typically provide a wrapper that calls this but you otherwise shouldn't call it directly.

If you're working with the standard library then it's recommended to use the `Waker::from` function instead which works with the safe `Arc` type and the safe `Wake` trait.

####

`pub fn wake(&self)`

[src]

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

Wake up the task associated with this `Waker`.

####

`pub fn will_wake(&self, other: &Waker) -> bool`

[src]

🔬 This is a nightly-only experimental API. (`futures_api` #50547)

futures in libcore are unstable

Returns whether or not this `Waker` and `other` awaken the same task.

This function works on a best-effort basis, and may return false even when the `Waker`s would awaken the same task. However, if this function returns true, it is guaranteed that the `Waker`s will awaken the same task.

This function is primarily used for optimization purposes.

## Trait Implementations

###

`impl From<LocalWaker> for Waker`

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####

`fn from(local_waker: LocalWaker) -> Waker`

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Performs the conversion.

###

`impl Debug for Waker`

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`fn fmt(&self, f: &mut Formatter) -> Result<(), Error>`

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Formats the value using the given formatter. Read more

###

`impl Clone for Waker`

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####

`fn clone(&self) -> Waker`

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Returns a copy of the value. Read more

####

`fn clone_from(&mut self, source: &Self)`

1.0.0
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Performs copy-assignment from `source`. Read more

###

`impl Drop for Waker`

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####

`fn drop(&mut self)`

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Executes the destructor for this type. Read more

###

`impl Sync for Waker`

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`impl Send for Waker`

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`impl<T> From<Arc<T>> for Waker where T: Wake + 'static,`

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`fn from(rc: Arc<T>) -> Self`

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Performs the conversion.

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