rust/src/test/run-pass/tcp-stress.rs

// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

// ignore-linux see joyent/libuv#1189
// ignore-android needs extra network permissions
// ignore-openbsd system ulimit (Too many open files)
// exec-env:RUST_LOG=debug

#![feature(rustc_private, libc, old_io, io, std_misc)]
#![allow(deprecated, unused_must_use)]

#[macro_use]
extern crate log;
extern crate libc;

use std::sync::mpsc::channel;
use std::old_io::net::tcp::{TcpListener, TcpStream};
use std::old_io::{Acceptor, Listener, Reader, Writer};
use std::thread::{self, Builder};
use std::time::Duration;

fn main() {
    // This test has a chance to time out, try to not let it time out
    thread::spawn(move|| -> () {
        use std::old_io::timer;
        timer::sleep(Duration::milliseconds(30 * 1000));
        println!("timed out!");
        unsafe { libc::exit(1) }
    });

    let (tx, rx) = channel();
    thread::spawn(move || -> () {
        let mut listener = TcpListener::bind("127.0.0.1:0").unwrap();
        tx.send(listener.socket_name().unwrap()).unwrap();
        let mut acceptor = listener.listen();
        loop {
            let mut stream = match acceptor.accept() {
                Ok(stream) => stream,
                Err(error) => {
                    debug!("accept panicked: {}", error);
                    continue;
                }
            };
            stream.read_byte();
            stream.write(&[2]);
        }
    });
    let addr = rx.recv().unwrap();

    let (tx, rx) = channel();
    for _ in 0..1000 {
        let tx = tx.clone();
        Builder::new().stack_size(64 * 1024).spawn(move|| {
            match TcpStream::connect(addr) {
                Ok(stream) => {
                    let mut stream = stream;
                    stream.write(&[1]);
                    let mut buf = [0];
                    stream.read(&mut buf);
                },
                Err(e) => debug!("{}", e)
            }
            tx.send(()).unwrap();
        });
    }

    // Wait for all clients to exit, but don't wait for the server to exit. The
    // server just runs infinitely.
    drop(tx);
    for _ in 0..1000 {
        rx.recv().unwrap();
    }
    unsafe { libc::exit(0) }
}