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alex and stjepang Bumped crossbeam-utils version (#746)
## Motivation

tokio depends on an out of date version of crossbeam-utils, which results in multiple versions of that package being linked in binaries which use other popular libraries.

## Solution

Bump the version; there's no API changes and tests still pass.
Latest commit e700607 Nov 10, 2018

README.md

Tokio Thread Pool

A library for scheduling execution of futures concurrently across a pool of threads.

Why not Rayon?

Rayon is designed to handle parallelizing single computations by breaking them into smaller chunks. The scheduling for each individual chunk doesn't matter as long as the root computation completes in a timely fashion. In other words, Rayon does not provide any guarantees of fairness with regards to how each task gets scheduled.

On the other hand, tokio-threadpool is a general purpose scheduler and attempts to schedule each task fairly. This is the ideal behavior when scheduling a set of unrelated tasks.

Why not futures-cpupool?

It's 10x slower.

Examples

extern crate tokio_threadpool;
extern crate futures;

use tokio_threadpool::ThreadPool;
use futures::{Future, lazy};
use futures::sync::oneshot;

pub fn main() {
    let pool = ThreadPool::new();
    let (tx, rx) = oneshot::channel();

    pool.spawn(lazy(|| {
        println!("Running on the pool");
        tx.send("complete").map_err(|e| println!("send error, {}", e))
    }));

    println!("Result: {:?}", rx.wait());
    pool.shutdown().wait().unwrap();
}

License

This project is licensed under the MIT license.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.