std::sync::mpsc::SyncSender - Rust
Description: API documentation for the Rust `SyncSender` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, SyncSender

# 1.0.0[−][src]Struct std::sync::mpsc::SyncSender

    pub struct SyncSender<T> { /* fields omitted */ }

The sending-half of Rust's synchronous `sync_channel` type.

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

`send` will block if there is no space in the internal buffer.

# Examples

    use std::sync::mpsc::sync_channel;
    use std::thread;

    // Create a sync_channel with buffer size 2
    let (sync_sender, receiver) = sync_channel(2);
    let sync_sender2 = sync_sender.clone();

    // First thread owns sync_sender
    thread::spawn(move || {
        sync_sender.send(1).unwrap();
        sync_sender.send(2).unwrap();
    });

    // Second thread owns sync_sender2
    thread::spawn(move || {
        sync_sender2.send(3).unwrap();
        // thread will now block since the buffer is full
        println!("Thread unblocked!");
    });

    let mut msg;

    msg = receiver.recv().unwrap();
    println!("message {} received", msg);

    // "Thread unblocked!" will be printed now

    msg = receiver.recv().unwrap();
    println!("message {} received", msg);

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

    println!("message {} received", msg);Run

## Methods

### `impl<T> SyncSender<T>`[src]

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

Sends a value on this synchronous channel.

This function will block until space in the internal buffer becomes available or a receiver is available to hand off the message to.

Note that a successful send does not guarantee that the receiver will ever see the data if there is a buffer on this channel. Items may be enqueued in the internal buffer for the receiver to receive at a later time. If the buffer size is 0, however, the channel becomes a rendezvous channel and it guarantees that the receiver has indeed received the data if this function returns success.

This function will never panic, but it may return `Err` if the `Receiver` has disconnected and is no longer able to receive information.

# Examples

    use std::sync::mpsc::sync_channel;
    use std::thread;

    // Create a rendezvous sync_channel with buffer size 0
    let (sync_sender, receiver) = sync_channel(0);

    thread::spawn(move || {
       println!("sending message...");
       sync_sender.send(1).unwrap();
       // Thread is now blocked until the message is received

       println!("...message received!");
    });

    let msg = receiver.recv().unwrap();
    assert_eq!(1, msg);Run

#### `pub fn try_send(&self, t: T) -> Result<(), TrySendError<T>>`[src]

Attempts to send a value on this channel without blocking.

This method differs from `send` by returning immediately if the channel's buffer is full or no receiver is waiting to acquire some data. Compared with `send`, this function has two failure cases instead of one (one for disconnection, one for a full buffer).

See `send` for notes about guarantees of whether the receiver has received the data or not if this function is successful.

# Examples

    use std::sync::mpsc::sync_channel;
    use std::thread;

    // Create a sync_channel with buffer size 1
    let (sync_sender, receiver) = sync_channel(1);
    let sync_sender2 = sync_sender.clone();

    // First thread owns sync_sender
    thread::spawn(move || {
        sync_sender.send(1).unwrap();
        sync_sender.send(2).unwrap();
        // Thread blocked
    });

    // Second thread owns sync_sender2
    thread::spawn(move || {
        // This will return an error and send
        // no message if the buffer is full
        sync_sender2.try_send(3).is_err();
    });

    let mut msg;
    msg = receiver.recv().unwrap();
    println!("message {} received", msg);

    msg = receiver.recv().unwrap();
    println!("message {} received", msg);

    // Third message may have never been sent
    match receiver.try_recv() {
        Ok(msg) => println!("message {} received", msg),
        Err(_) => println!("the third message was never sent"),
    }Run

## Trait Implementations

### `impl<T> Clone for SyncSender<T>`[src]

#### `fn clone(&self) -> SyncSender<T>`[src]

Returns a copy of the value. Read more

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

Performs copy-assignment from `source`. Read more

### `impl<T> Debug for SyncSender<T>`
1.8.0
[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

### `impl<T> Drop for SyncSender<T>`[src]

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

Executes the destructor for this type. Read more

### `impl<T: Send> Send for SyncSender<T>`[src]

## Auto Trait Implementations

### `impl<T> Sync for SyncSender<T> where
T: Send,`

## Blanket Implementations

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

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

Performs the conversion.

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

#### `type Error = Infallible`

The type returned in the event of a conversion error.

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

Performs the conversion.

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

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

The type returned in the event of a conversion error.

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

Performs the conversion.

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

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

Performs the conversion.

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

####
ⓘImportant traits for &'_ mut I

### Important 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: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

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

####
ⓘImportant traits for &'_ mut I

### Important 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: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<R: Read + ?Sized, '_> Read for &'_ mut Rimpl<W: Write + ?Sized, '_> Write for &'_ mut W`
`fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

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

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

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

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

#### `type Owned = T`

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

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

#### `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

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