# Struct std::sync::mpsc::Sender

1.0.0 · source ·

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

Expand description

The sending-half of Rust’s asynchronous `channel` type.

Messages can be sent through this channel with `send`.

Note: all senders (the original and its clones) need to be dropped for the receiver to stop blocking to receive messages with `Receiver::recv`.

## Examples

    use std::sync::mpsc::channel;
    use std::thread;

    let (sender, receiver) = channel();
    let sender2 = sender.clone();

    // First thread owns sender
    thread::spawn(move || {
        sender.send(1).unwrap();
    });

    // Second thread owns sender2
    thread::spawn(move || {
        sender2.send(2).unwrap();
    });

    let msg = receiver.recv().unwrap();
    let msg2 = receiver.recv().unwrap();

    assert_eq!(3, msg + msg2);

Run

## Implementations§

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### impl<T> Sender<T>

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#### pub fn send(&self, t: T) -> Result<(), SendError<T>>

Attempts to send a value on this channel, returning it back if it could not be sent.

A successful send occurs when it is determined that the other end of the channel has not hung up already. An unsuccessful send would be one where the corresponding receiver has already been deallocated. Note that a return value of `Err` means that the data will never be received, but a return value of `Ok` does not mean that the data will be received. It is possible for the corresponding receiver to hang up immediately after this function returns `Ok`.

This method will never block the current thread.

##### Examples

    use std::sync::mpsc::channel;

    let (tx, rx) = channel();

    // This send is always successful
    tx.send(1).unwrap();

    // This send will fail because the receiver is gone
    drop(rx);
    assert_eq!(tx.send(1).unwrap_err().0, 1);

Run

## Trait Implementations§

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### impl<T> Clone for Sender<T>

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

Clone a sender to send to other threads.

Note, be aware of the lifetime of the sender because all senders (including the original) need to be dropped in order for `Receiver::recv` to stop blocking.

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

Performs copy-assignment from `source`. Read more
1.8.0 · source§

### impl<T> Debug for Sender<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 Sender<T>

1.72.0 · source§

### impl<T: Send> Sync for Sender<T>

## Auto Trait Implementations§

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### impl<T> RefUnwindSafe for Sender<T>

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### impl<T> Unpin for Sender<T>

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### impl<T> UnwindSafe for Sender<T>

## Blanket Implementations§

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### impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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> ToOwned for Twhere 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 Twhere 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 Twhere 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.