I just want to resue buffer after it be send by channel, becasue buffer.to_owned() is expensive when iterated tens of thousands of times.
Here is the simplified code:

use crossbeam_channel::bounded;
use std::thread;

fn main() {

    thread::scope(|work| {
        let batch_size = 100000000;
        let (in_s, in_r) = bounded(1);
        work.spawn(move || {
            let mut buffer = Vec::with_capacity(batch_size);
            for i in 0..10000{
                buffer.extend(std::iter::repeat(4).take(batch_size));//read data from file
                in_s.send(buffer.to_owned()).unwrap();
                buffer.clear();
            }
        });

        work.spawn(move || {
            while let Ok(data) = in_r.recv() {
                // do some caculation
            }
        });
    });
}

So how can I modify the above code to reuse the buffer?
I have tried to resend buffer in the receiving thread to the sending thread, but failed.