Struct crossbeam::channel::Sender

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

The sending side of a channel.

Examples

use std::thread;
use crossbeam_channel::unbounded;

let (s1, r) = unbounded();
let s2 = s1.clone();

thread::spawn(move || s1.send(1).unwrap());
thread::spawn(move || s2.send(2).unwrap());

let msg1 = r.recv().unwrap();
let msg2 = r.recv().unwrap();

assert_eq!(msg1 + msg2, 3);

Implementations§

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impl<T> Sender<T>

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pub fn try_send(&self, msg: T) -> Result<(), TrySendError<T>>

Attempts to send a message into the channel without blocking.

This method will either send a message into the channel immediately or return an error if the channel is full or disconnected. The returned error contains the original message.

If called on a zero-capacity channel, this method will send the message only if there happens to be a receive operation on the other side of the channel at the same time.

Examples
use crossbeam_channel::{bounded, TrySendError};

let (s, r) = bounded(1);

assert_eq!(s.try_send(1), Ok(()));
assert_eq!(s.try_send(2), Err(TrySendError::Full(2)));

drop(r);
assert_eq!(s.try_send(3), Err(TrySendError::Disconnected(3)));
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pub fn send(&self, msg: T) -> Result<(), SendError<T>>

Blocks the current thread until a message is sent or the channel is disconnected.

If the channel is full and not disconnected, this call will block until the send operation can proceed. If the channel becomes disconnected, this call will wake up and return an error. The returned error contains the original message.

If called on a zero-capacity channel, this method will wait for a receive operation to appear on the other side of the channel.

Examples
use std::thread;
use std::time::Duration;
use crossbeam_channel::{bounded, SendError};

let (s, r) = bounded(1);
assert_eq!(s.send(1), Ok(()));

thread::spawn(move || {
    assert_eq!(r.recv(), Ok(1));
    thread::sleep(Duration::from_secs(1));
    drop(r);
});

assert_eq!(s.send(2), Ok(()));
assert_eq!(s.send(3), Err(SendError(3)));
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pub fn send_timeout( &self, msg: T, timeout: Duration ) -> Result<(), SendTimeoutError<T>>

Waits for a message to be sent into the channel, but only for a limited time.

If the channel is full and not disconnected, this call will block until the send operation can proceed or the operation times out. If the channel becomes disconnected, this call will wake up and return an error. The returned error contains the original message.

If called on a zero-capacity channel, this method will wait for a receive operation to appear on the other side of the channel.

Examples
use std::thread;
use std::time::Duration;
use crossbeam_channel::{bounded, SendTimeoutError};

let (s, r) = bounded(0);

thread::spawn(move || {
    thread::sleep(Duration::from_secs(1));
    assert_eq!(r.recv(), Ok(2));
    drop(r);
});

assert_eq!(
    s.send_timeout(1, Duration::from_millis(500)),
    Err(SendTimeoutError::Timeout(1)),
);
assert_eq!(
    s.send_timeout(2, Duration::from_secs(1)),
    Ok(()),
);
assert_eq!(
    s.send_timeout(3, Duration::from_millis(500)),
    Err(SendTimeoutError::Disconnected(3)),
);
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pub fn send_deadline( &self, msg: T, deadline: Instant ) -> Result<(), SendTimeoutError<T>>

Waits for a message to be sent into the channel, but only until a given deadline.

If the channel is full and not disconnected, this call will block until the send operation can proceed or the operation times out. If the channel becomes disconnected, this call will wake up and return an error. The returned error contains the original message.

If called on a zero-capacity channel, this method will wait for a receive operation to appear on the other side of the channel.

Examples
use std::thread;
use std::time::{Duration, Instant};
use crossbeam_channel::{bounded, SendTimeoutError};

let (s, r) = bounded(0);

thread::spawn(move || {
    thread::sleep(Duration::from_secs(1));
    assert_eq!(r.recv(), Ok(2));
    drop(r);
});

let now = Instant::now();

assert_eq!(
    s.send_deadline(1, now + Duration::from_millis(500)),
    Err(SendTimeoutError::Timeout(1)),
);
assert_eq!(
    s.send_deadline(2, now + Duration::from_millis(1500)),
    Ok(()),
);
assert_eq!(
    s.send_deadline(3, now + Duration::from_millis(2000)),
    Err(SendTimeoutError::Disconnected(3)),
);
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pub fn is_empty(&self) -> bool

Returns true if the channel is empty.

Note: Zero-capacity channels are always empty.

Examples
use crossbeam_channel::unbounded;

let (s, r) = unbounded();
assert!(s.is_empty());

s.send(0).unwrap();
assert!(!s.is_empty());
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pub fn is_full(&self) -> bool

Returns true if the channel is full.

Note: Zero-capacity channels are always full.

Examples
use crossbeam_channel::bounded;

let (s, r) = bounded(1);

assert!(!s.is_full());
s.send(0).unwrap();
assert!(s.is_full());
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pub fn len(&self) -> usize

Returns the number of messages in the channel.

Examples
use crossbeam_channel::unbounded;

let (s, r) = unbounded();
assert_eq!(s.len(), 0);

s.send(1).unwrap();
s.send(2).unwrap();
assert_eq!(s.len(), 2);
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pub fn capacity(&self) -> Option<usize>

If the channel is bounded, returns its capacity.

Examples
use crossbeam_channel::{bounded, unbounded};

let (s, _) = unbounded::<i32>();
assert_eq!(s.capacity(), None);

let (s, _) = bounded::<i32>(5);
assert_eq!(s.capacity(), Some(5));

let (s, _) = bounded::<i32>(0);
assert_eq!(s.capacity(), Some(0));
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pub fn same_channel(&self, other: &Sender<T>) -> bool

Returns true if senders belong to the same channel.

Examples
use crossbeam_channel::unbounded;

let (s, _) = unbounded::<usize>();

let s2 = s.clone();
assert!(s.same_channel(&s2));

let (s3, _) = unbounded();
assert!(!s.same_channel(&s3));

Trait Implementations§

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impl<T> Clone for Sender<T>

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

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

Formats the value using the given formatter. Read more
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impl<T> Drop for Sender<T>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<T> RefUnwindSafe for Sender<T>

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impl<T> Send for Sender<T>
where T: Send,

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impl<T> Sync for Sender<T>
where T: Send,

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impl<T> UnwindSafe for Sender<T>

Auto Trait Implementations§

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impl<T> Unpin for Sender<T>

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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.