Nested futures deadlock

Cargo.lock

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Cargo.toml

[package]
name = "tokio-deadlock"
version = "0.1.0"
authors = ["Matt Hauck <[email protected]>"]

[dependencies]
tokio = "0.1.8"
futures = "0.1.24"

main.rs

extern crate futures;
extern crate tokio;

use futures::Future;
use futures::sync::oneshot;

const NUM_THREADS: usize = 2;
const NUM_JOBS: u32 = 2;

fn main() {
    let mut threadpool =  tokio::executor::thread_pool::Builder::new();
    threadpool.pool_size(NUM_THREADS);
    let mut runtime = tokio::runtime::Builder::new()
        .threadpool_builder(threadpool)
        .build()
        .unwrap();

    // launch the main future
    runtime.spawn(futures::future::lazy(|| {
        run();
        futures::future::ok(())
    }));

    runtime.shutdown_on_idle().wait().unwrap();
}

fn run() {
    for i in 0..NUM_JOBS {
        // launch some future work
        tokio::spawn(futures::future::lazy(move || {
            println!("starting {}", i);
            let id = do_some_future_work(i).wait().unwrap();
            println!("finished {} -- {}", i, id);
            futures::future::ok(())
        }));
    }
}

fn do_some_future_work(id: u32) -> oneshot::Receiver<u32> {
    let (tx, rx) = oneshot::channel::<u32>();

    // launch some nested future work
    println!("spawning another future for {}", id);
    tokio::spawn(futures::future::lazy(move || {
        println!("sending response from the future for {}", id);
        tx.send(id).unwrap();
        futures::future::ok(())
    }));

    rx
}