pub struct Stealer<T> { /* private fields */ }
Expand description

A stealer handle of a worker queue.

Stealers can be shared among threads.

Task schedulers typically have a single worker queue per worker thread.

§Examples

use crossbeam_deque::{Steal, Worker};

let w = Worker::new_lifo();
w.push(1);
w.push(2);

let s = w.stealer();
assert_eq!(s.steal(), Steal::Success(1));
assert_eq!(s.steal(), Steal::Success(2));
assert_eq!(s.steal(), Steal::Empty);

Implementations§

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impl<T> Stealer<T>

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pub fn is_empty(&self) -> bool

Returns true if the queue is empty.

use crossbeam_deque::Worker;

let w = Worker::new_lifo();
let s = w.stealer();

assert!(s.is_empty());
w.push(1);
assert!(!s.is_empty());
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pub fn len(&self) -> usize

Returns the number of tasks in the deque.

use crossbeam_deque::Worker;

let w = Worker::new_lifo();
let s = w.stealer();

assert_eq!(s.len(), 0);
w.push(1);
assert_eq!(s.len(), 1);
w.push(2);
assert_eq!(s.len(), 2);
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pub fn steal(&self) -> Steal<T>

Steals a task from the queue.

§Examples
use crossbeam_deque::{Steal, Worker};

let w = Worker::new_lifo();
w.push(1);
w.push(2);

let s = w.stealer();
assert_eq!(s.steal(), Steal::Success(1));
assert_eq!(s.steal(), Steal::Success(2));
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pub fn steal_batch(&self, dest: &Worker<T>) -> Steal<()>

Steals a batch of tasks and pushes them into another worker.

How many tasks exactly will be stolen is not specified. That said, this method will try to steal around half of the tasks in the queue, but also not more than some constant limit.

§Examples
use crossbeam_deque::Worker;

let w1 = Worker::new_fifo();
w1.push(1);
w1.push(2);
w1.push(3);
w1.push(4);

let s = w1.stealer();
let w2 = Worker::new_fifo();

let _ = s.steal_batch(&w2);
assert_eq!(w2.pop(), Some(1));
assert_eq!(w2.pop(), Some(2));
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pub fn steal_batch_and_pop(&self, dest: &Worker<T>) -> Steal<T>

Steals a batch of tasks, pushes them into another worker, and pops a task from that worker.

How many tasks exactly will be stolen is not specified. That said, this method will try to steal around half of the tasks in the queue, but also not more than some constant limit.

§Examples
use crossbeam_deque::{Steal, Worker};

let w1 = Worker::new_fifo();
w1.push(1);
w1.push(2);
w1.push(3);
w1.push(4);

let s = w1.stealer();
let w2 = Worker::new_fifo();

assert_eq!(s.steal_batch_and_pop(&w2), Steal::Success(1));
assert_eq!(w2.pop(), Some(2));

Trait Implementations§

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impl<T> Clone for Stealer<T>

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fn clone(&self) -> Stealer<T>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T> Debug for Stealer<T>

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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<T: Send> Send for Stealer<T>

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impl<T: Send> Sync for Stealer<T>

Auto Trait Implementations§

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impl<T> RefUnwindSafe for Stealer<T>
where T: RefUnwindSafe,

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impl<T> Unpin for Stealer<T>

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impl<T> UnwindSafe for Stealer<T>
where T: RefUnwindSafe,

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, 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> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

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