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#![feature(test)]
extern crate test;
use crate::test::Bencher;
use futures::channel::oneshot;
use futures::executor::block_on;
use futures::future;
use futures::stream::{FuturesUnordered, StreamExt};
use futures::task::Poll;
use std::collections::VecDeque;
use std::thread;
#[bench]
fn oneshots(b: &mut Bencher) {
const NUM: usize = 10_000;
b.iter(|| {
let mut txs = VecDeque::with_capacity(NUM);
let mut rxs = FuturesUnordered::new();
for _ in 0..NUM {
let (tx, rx) = oneshot::channel();
txs.push_back(tx);
rxs.push(rx);
}
thread::spawn(move || {
while let Some(tx) = txs.pop_front() {
let _ = tx.send("hello");
}
});
block_on(future::poll_fn(move |cx| {
loop {
if let Poll::Ready(None) = rxs.poll_next_unpin(cx) {
break;
}
}
Poll::Ready(())
}))
});
}