# Function std::sync::mpsc::sync_channel 1.0.0 [−] [src]

    pub fn sync_channel<T>(bound: usize) -> (SyncSender<T>, Receiver<T>)

Creates a new synchronous, bounded channel.

Like asynchronous channels, the `Receiver` will block until a message becomes available. These channels differ greatly in the semantics of the sender from asynchronous channels, however.

This channel has an internal buffer on which messages will be queued. `bound` specifies the buffer size. When the internal buffer becomes full, future sends will block waiting for the buffer to open up. Note that a buffer size of 0 is valid, in which case this becomes "rendezvous channel" where each `send()` will not return until a recv is paired with it.

Like asynchronous channels, if the `Receiver` is disconnected while trying to `send()` with the `SyncSender`, the `send()` method will return an error.

# Examples

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

    let (tx, rx) = sync_channel(1);

    // this returns immediately
    tx.send(1).unwrap();

    thread::spawn(move|| {
        // this will block until the previous message has been received
        tx.send(2).unwrap();
    });

    assert_eq!(rx.recv().unwrap(), 1);
    assert_eq!(rx.recv().unwrap(), 2);Run

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