# Struct std::task::Waker 1.36.0[−][src]

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

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

This handle encapsulates a `RawWaker` instance, which defines the executor-specific wakeup behavior.

Implements `Clone`, `Send`, and `Sync`.

## Implementations

### `impl Waker`[src]

#### `pub fn wake(self)`[src]

Wake up the task associated with this `Waker`.

#### `pub fn wake_by_ref(&self)`[src]

Wake up the task associated with this `Waker` without consuming the `Waker`.

This is similar to `wake`, but may be slightly less efficient in the case where an owned `Waker` is available. This method should be preferred to calling `waker.clone().wake()`.

#### `pub fn will_wake(&self, other: &Waker) -> bool`[src]

Returns `true` if this `Waker` and another `Waker` have awoken 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.

#### `pub unsafe fn from_raw(waker: RawWaker) -> Waker`[src]

Creates a new `Waker` from `RawWaker`.

The behavior of the returned `Waker` is undefined if the contract defined in `RawWaker`’s and `RawWakerVTable`’s documentation is not upheld. Therefore this method is unsafe.

## Trait Implementations

### `impl Clone for Waker`[src]

#### `pub fn clone(&self) -> Waker`[src]

Returns a copy of the value. Read more

#### `pub fn clone_from(&mut self, source: &Self)`1.0.0[src]

Performs copy-assignment from `source`. Read more

### `impl Debug for Waker`[src]

#### `pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>`[src]

Formats the value using the given formatter. Read more

### `impl Drop for Waker`[src]

#### `pub fn drop(&mut self)`[src]

Executes the destructor for this type. Read more

### `impl<W> From<Arc<W>> for Waker where
W: 'static + Wake + Send + Sync,` 1.51.0[src]

#### `pub fn from(waker: Arc<W>) -> Waker`[src]

Performs the conversion.

### `impl Send for Waker`[src]

### `impl Sync for Waker`[src]

### `impl Unpin for Waker`[src]

## Auto Trait Implementations

### `impl RefUnwindSafe for Waker`

### `impl UnwindSafe for Waker`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &Tⓘ

### Notable traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W`
`[src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut Tⓘ

### Notable traits for &'_ mut I

`impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized> Read for &mut Rimpl<W: Write + ?Sized> Write for &mut W`
`[src]

Mutably borrows from an owned value. Read more

### `impl<T> From<T> for T`[src]

#### `pub fn from(t: T) -> T`[src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U`[src]

Performs the conversion.

### `impl<T> ToOwned for T where
T: Clone,` [src]

#### `type Owned = T`

The resulting type after obtaining ownership.

#### `pub fn to_owned(&self) -> T`[src]

Creates owned data from borrowed data, usually by cloning. Read more

#### `pub fn clone_into(&self, target: &mut T)`[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into` #41263)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

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

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.