convert std::sync::mpsc to crossbeam_channel (#22264)

net-utils/Cargo.toml

@@ -12,6 +12,7 @@ edition = "2021"
 [dependencies]
 bincode = "1.3.3"
 clap = "2.33.1"
+crossbeam-channel = "0.5"
 log = "0.4.14"
 nix = "0.23.1"
 rand = "0.7.0"

net-utils/src/lib.rs

@@ -1,6 +1,7 @@
 //! The `net_utils` module assists with networking
 #![allow(clippy::integer_arithmetic)]
 use {
+    crossbeam_channel::unbounded,
     log::*,
     rand::{thread_rng, Rng},
     socket2::{Domain, SockAddr, Socket, Type},
@@ -8,7 +9,7 @@ use {
         collections::{BTreeMap, HashSet},
         io::{self, Read, Write},
         net::{IpAddr, SocketAddr, TcpListener, TcpStream, ToSocketAddrs, UdpSocket},
-        sync::{mpsc::channel, Arc, RwLock},
+        sync::{Arc, RwLock},
         time::{Duration, Instant},
     },
     url::Url,
@@ -138,7 +139,7 @@ fn do_verify_reachable_ports(
 
     // Wait for a connection to open on each TCP port
     for (port, tcp_listener) in tcp_listeners {
-        let (sender, receiver) = channel();
+        let (sender, receiver) = unbounded();
         let listening_addr = tcp_listener.local_addr().unwrap();
         let thread_handle = std::thread::spawn(move || {
             debug!("Waiting for incoming connection on tcp/{}", port);