Struct std::sync::mpsc::SyncSender1.0.0[][src]

pub struct SyncSender<T> {
    inner: Arc<Packet<T>>,
}
Expand description

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

Fields

inner: Arc<Packet<T>>

Implementations

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

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
    let _ = sync_sender2.try_send(3);
});

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

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Executes the destructor for this type. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

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

🔬 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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.