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Code Issues Releases Wiki Activity

remove RUNNING Q PENDING thread locals from actix-rt (#207)

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fakeshadow 2020-12-27 07:26:02 +08:00 committed by GitHub
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commit 518bf3f6a6
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10 changed files with 273 additions and 274 deletions
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12
actix-rt/CHANGES.md
View File

@ -6,6 +6,18 @@
* Add `System::attach_to_tokio` method. [#173]
### Changed
* Remove `'static` lifetime requirement for `Runtime::block_on` and `SystemRunner::block_on`.
Remove `'static` lifetime requirement for `System::run` and `Builder::run`.
`Arbiter::spawn` would panic when `System` is not in scope. [#207]
### Fixed
* Fix work load issue by removing `PENDDING` thread local. [#207]
[#207]: https://github.com/actix/actix-net/pull/207
## [1.1.1] - 2020-04-30
### Fixed

7
actix-rt/Cargo.toml
View File

@ -17,11 +17,10 @@ path = "src/lib.rs"
[dependencies]
actix-macros = "0.1.0"
copyless = "0.1.4"
futures-channel = "0.3.4"
futures-util = { version = "0.3.4", default-features = false, features = ["alloc"] }
smallvec = "1"
futures-channel = "0.3.7"
tokio = { version = "0.2.6", default-features = false, features = ["rt-core", "rt-util", "io-driver", "tcp", "uds", "udp", "time", "signal", "stream"] }
[dev-dependencies]
futures-util = { version = "0.3.7", default-features = false, features = ["alloc"] }
tokio = { version = "0.2.6", features = ["full"] }

218
actix-rt/src/arbiter.rs
View File

@ -1,6 +1,7 @@
use std::any::{Any, TypeId};
use std::cell::{Cell, RefCell};
use std::cell::RefCell;
use std::collections::HashMap;
use std::future::Future;
use std::pin::Pin;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::task::{Context, Poll};
@ -8,24 +9,23 @@ use std::{fmt, thread};
use futures_channel::mpsc::{unbounded, UnboundedReceiver, UnboundedSender};
use futures_channel::oneshot::{channel, Canceled, Sender};
use futures_util::{
future::{self, Future, FutureExt},
stream::Stream,
};
// use futures_util::stream::FuturesUnordered;
// use tokio::task::JoinHandle;
// use tokio::stream::StreamExt;
use tokio::stream::Stream;
use tokio::task::LocalSet;
use crate::runtime::Runtime;
use crate::system::System;
use copyless::BoxHelper;
use smallvec::SmallVec;
pub use tokio::task::JoinHandle;
thread_local!(
static ADDR: RefCell<Option<Arbiter>> = RefCell::new(None);
static RUNNING: Cell<bool> = Cell::new(false);
static Q: RefCell<Vec<Pin<Box<dyn Future<Output = ()>>>>> = RefCell::new(Vec::new());
static PENDING: RefCell<SmallVec<[JoinHandle<()>; 8]>> = RefCell::new(SmallVec::new());
// TODO: Commented out code are for Arbiter::local_join function.
// It can be safely removed if this function is not used in actix-*.
//
// /// stores join handle for spawned async tasks.
// static HANDLE: RefCell<FuturesUnordered<JoinHandle<()>>> =
// RefCell::new(FuturesUnordered::new());
static STORAGE: RefCell<HashMap<TypeId, Box<dyn Any>>> = RefCell::new(HashMap::new());
);
@ -69,14 +69,14 @@ impl Default for Arbiter {
}
impl Arbiter {
pub(crate) fn new_system() -> Self {
pub(crate) fn new_system(local: &LocalSet) -> Self {
let (tx, rx) = unbounded();
let arb = Arbiter::with_sender(tx);
ADDR.with(|cell| *cell.borrow_mut() = Some(arb.clone()));
RUNNING.with(|cell| cell.set(false));
STORAGE.with(|cell| cell.borrow_mut().clear());
Arbiter::spawn(ArbiterController { stop: None, rx });
local.spawn_local(ArbiterController { rx });
arb
}
@ -91,8 +91,9 @@ impl Arbiter {
}
/// Check if current arbiter is running.
#[deprecated(note = "Thread local variables for running state of Arbiter is removed")]
pub fn is_running() -> bool {
RUNNING.with(|cell| cell.get())
false
}
/// Stop arbiter from continuing it's event loop.
@ -106,69 +107,47 @@ impl Arbiter {
let id = COUNT.fetch_add(1, Ordering::Relaxed);
let name = format!("actix-rt:worker:{}", id);
let sys = System::current();
let (arb_tx, arb_rx) = unbounded();
let arb_tx2 = arb_tx.clone();
let (tx, rx) = unbounded();
let handle = thread::Builder::new()
.name(name.clone())
.spawn(move || {
let mut rt = Runtime::new().expect("Can not create Runtime");
let arb = Arbiter::with_sender(arb_tx);
.spawn({
let tx = tx.clone();
move || {
let mut rt = Runtime::new().expect("Can not create Runtime");
let arb = Arbiter::with_sender(tx);
let (stop, stop_rx) = channel();
RUNNING.with(|cell| cell.set(true));
STORAGE.with(|cell| cell.borrow_mut().clear());
STORAGE.with(|cell| cell.borrow_mut().clear());
System::set_current(sys);
System::set_current(sys);
// start arbiter controller
rt.spawn(ArbiterController {
stop: Some(stop),
rx: arb_rx,
});
ADDR.with(|cell| *cell.borrow_mut() = Some(arb.clone()));
ADDR.with(|cell| *cell.borrow_mut() = Some(arb.clone()));
// register arbiter
let _ = System::current()
.sys()
.unbounded_send(SystemCommand::RegisterArbiter(id, arb));
// register arbiter
let _ = System::current()
.sys()
.unbounded_send(SystemCommand::RegisterArbiter(id, arb));
// run loop
let _ = rt.block_on(stop_rx).unwrap_or(1);
// start arbiter controller
// run loop
rt.block_on(ArbiterController { rx });
// unregister arbiter
let _ = System::current()
.sys()
.unbounded_send(SystemCommand::UnregisterArbiter(id));
// unregister arbiter
let _ = System::current()
.sys()
.unbounded_send(SystemCommand::UnregisterArbiter(id));
}
})
.unwrap_or_else(|err| {
panic!("Cannot spawn an arbiter's thread {:?}: {:?}", &name, err)
});
Arbiter {
sender: arb_tx2,
sender: tx,
thread_handle: Some(handle),
}
}
pub(crate) fn run_system(rt: Option<&Runtime>) {
RUNNING.with(|cell| cell.set(true));
Q.with(|cell| {
let mut v = cell.borrow_mut();
for fut in v.drain(..) {
if let Some(rt) = rt {
rt.spawn(fut);
} else {
tokio::task::spawn_local(fut);
}
}
});
}
pub(crate) fn stop_system() {
RUNNING.with(|cell| cell.set(false));
}
/// Spawn a future on the current thread. This does not create a new Arbiter
/// or Arbiter address, it is simply a helper for spawning futures on the current
/// thread.
@ -176,26 +155,12 @@ impl Arbiter {
where
F: Future<Output = ()> + 'static,
{
RUNNING.with(move |cell| {
if cell.get() {
// Spawn the future on running executor
let len = PENDING.with(move |cell| {
let mut p = cell.borrow_mut();
p.push(tokio::task::spawn_local(future));
p.len()
});
if len > 7 {
// Before reaching the inline size
tokio::task::spawn_local(CleanupPending);
}
} else {
// Box the future and push it to the queue, this results in double boxing
// because the executor boxes the future again, but works for now
Q.with(move |cell| {
cell.borrow_mut().push(Pin::from(Box::alloc().init(future)))
});
}
});
// HANDLE.with(|handle| {
// let handle = handle.borrow();
// handle.push(tokio::task::spawn_local(future));
// });
// let _ = tokio::task::spawn_local(CleanupPending);
let _ = tokio::task::spawn_local(future);
}
/// Executes a future on the current thread. This does not create a new Arbiter
@ -206,7 +171,9 @@ impl Arbiter {
F: FnOnce() -> R + 'static,
R: Future<Output = ()> + 'static,
{
Arbiter::spawn(future::lazy(|_| f()).flatten())
Arbiter::spawn(async {
f();
})
}
/// Send a future to the Arbiter's thread, and spawn it.
@ -313,40 +280,33 @@ impl Arbiter {
/// Returns a future that will be completed once all currently spawned futures
/// have completed.
pub fn local_join() -> impl Future<Output = ()> {
PENDING.with(move |cell| {
let current = cell.replace(SmallVec::new());
future::join_all(current).map(|_| ())
})
#[deprecated(since = "1.2.0", note = "Arbiter::local_join function is removed.")]
pub async fn local_join() {
// let handle = HANDLE.with(|fut| std::mem::take(&mut *fut.borrow_mut()));
// async move {
// handle.collect::<Vec<_>>().await;
// }
unimplemented!("Arbiter::local_join function is removed.")
}
}
/// Future used for cleaning-up already finished `JoinHandle`s
/// from the `PENDING` list so the vector doesn't grow indefinitely
struct CleanupPending;
impl Future for CleanupPending {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
PENDING.with(move |cell| {
let mut pending = cell.borrow_mut();
let mut i = 0;
while i != pending.len() {
if Pin::new(&mut pending[i]).poll(cx).is_ready() {
pending.remove(i);
} else {
i += 1;
}
}
});
Poll::Ready(())
}
}
// /// Future used for cleaning-up already finished `JoinHandle`s
// /// from the `PENDING` list so the vector doesn't grow indefinitely
// struct CleanupPending;
//
// impl Future for CleanupPending {
// type Output = ();
//
// fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
// HANDLE.with(move |handle| {
// recycle_join_handle(&mut *handle.borrow_mut(), cx);
// });
//
// Poll::Ready(())
// }
// }
struct ArbiterController {
stop: Option<Sender<i32>>,
rx: UnboundedReceiver<ArbiterCommand>,
}
@ -371,22 +331,14 @@ impl Future for ArbiterController {
match Pin::new(&mut self.rx).poll_next(cx) {
Poll::Ready(None) => return Poll::Ready(()),
Poll::Ready(Some(item)) => match item {
ArbiterCommand::Stop => {
if let Some(stop) = self.stop.take() {
let _ = stop.send(0);
};
return Poll::Ready(());
}
ArbiterCommand::Stop => return Poll::Ready(()),
ArbiterCommand::Execute(fut) => {
let len = PENDING.with(move |cell| {
let mut p = cell.borrow_mut();
p.push(tokio::task::spawn_local(fut));
p.len()
});
if len > 7 {
// Before reaching the inline size
tokio::task::spawn_local(CleanupPending);
}
// HANDLE.with(|handle| {
// let mut handle = handle.borrow_mut();
// handle.push(tokio::task::spawn_local(fut));
// recycle_join_handle(&mut *handle, cx);
// });
tokio::task::spawn_local(fut);
}
ArbiterCommand::ExecuteFn(f) => {
f.call_box();
@ -398,6 +350,20 @@ impl Future for ArbiterController {
}
}
// fn recycle_join_handle(handle: &mut FuturesUnordered<JoinHandle<()>>, cx: &mut Context<'_>) {
// let _ = Pin::new(&mut *handle).poll_next(cx);
//
// // Try to recycle more join handles and free up memory.
// //
// // this is a guess. The yield limit for FuturesUnordered is 32.
// // So poll an extra 3 times would make the total poll below 128.
// if handle.len() > 64 {
// (0..3).for_each(|_| {
// let _ = Pin::new(&mut *handle).poll_next(cx);
// })
// }
// }
#[derive(Debug)]
pub(crate) enum SystemCommand {
Exit(i32),

67
actix-rt/src/builder.rs
View File

@ -1,9 +1,9 @@
use std::borrow::Cow;
use std::future::Future;
use std::io;
use futures_channel::mpsc::unbounded;
use futures_channel::oneshot::{channel, Receiver};
use futures_util::future::{lazy, Future, FutureExt};
use tokio::task::LocalSet;
use crate::arbiter::{Arbiter, SystemArbiter};
@ -65,7 +65,7 @@ impl Builder {
/// Function `f` get called within tokio runtime context.
pub fn run<F>(self, f: F) -> io::Result<()>
where
F: FnOnce() + 'static,
F: FnOnce(),
{
self.create_runtime(f).run()
}
@ -74,7 +74,8 @@ impl Builder {
let (stop_tx, stop) = channel();
let (sys_sender, sys_receiver) = unbounded();
let system = System::construct(sys_sender, Arbiter::new_system(), self.stop_on_panic);
let system =
System::construct(sys_sender, Arbiter::new_system(local), self.stop_on_panic);
// system arbiter
let arb = SystemArbiter::new(stop_tx, sys_receiver);
@ -87,21 +88,26 @@ impl Builder {
fn create_runtime<F>(self, f: F) -> SystemRunner
where
F: FnOnce() + 'static,
F: FnOnce(),
{
let (stop_tx, stop) = channel();
let (sys_sender, sys_receiver) = unbounded();
let system = System::construct(sys_sender, Arbiter::new_system(), self.stop_on_panic);
let mut rt = Runtime::new().unwrap();
let system = System::construct(
sys_sender,
Arbiter::new_system(rt.local()),
self.stop_on_panic,
);
// system arbiter
let arb = SystemArbiter::new(stop_tx, sys_receiver);
let mut rt = Runtime::new().unwrap();
rt.spawn(arb);
// init system arbiter and run configuration method
rt.block_on(lazy(move |_| f()));
rt.block_on(async { f() });
SystemRunner { rt, stop, system }
}
@ -120,27 +126,21 @@ impl AsyncSystemRunner {
let AsyncSystemRunner { stop, .. } = self;
// run loop
lazy(|_| {
Arbiter::run_system(None);
async {
let res = match stop.await {
Ok(code) => {
if code != 0 {
Err(io::Error::new(
io::ErrorKind::Other,
format!("Non-zero exit code: {}", code),
))
} else {
Ok(())
}
async {
match stop.await {
Ok(code) => {
if code != 0 {
Err(io::Error::new(
io::ErrorKind::Other,
format!("Non-zero exit code: {}", code),
))
} else {
Ok(())
}
Err(e) => Err(io::Error::new(io::ErrorKind::Other, e)),
};
Arbiter::stop_system();
res
}
Err(e) => Err(io::Error::new(io::ErrorKind::Other, e)),
}
})
.flatten()
}
}
}
@ -160,8 +160,7 @@ impl SystemRunner {
let SystemRunner { mut rt, stop, .. } = self;
// run loop
Arbiter::run_system(Some(&rt));
let result = match rt.block_on(stop) {
match rt.block_on(stop) {
Ok(code) => {
if code != 0 {
Err(io::Error::new(
@ -173,19 +172,15 @@ impl SystemRunner {
}
}
Err(e) => Err(io::Error::new(io::ErrorKind::Other, e)),
};
Arbiter::stop_system();
result
}
}
/// Execute a future and wait for result.
#[inline]
pub fn block_on<F, O>(&mut self, fut: F) -> O
where
F: Future<Output = O> + 'static,
F: Future<Output = O>,
{
Arbiter::run_system(Some(&self.rt));
let res = self.rt.block_on(fut);
Arbiter::stop_system();
res
self.rt.block_on(fut)
}
}

11
actix-rt/src/lib.rs
View File

@ -4,6 +4,8 @@
#![doc(html_logo_url = "https://actix.rs/img/logo.png")]
#![doc(html_favicon_url = "https://actix.rs/favicon.ico")]
use std::future::Future;
#[cfg(not(test))] // Work around for rust-lang/rust#62127
pub use actix_macros::{main, test};
@ -22,15 +24,12 @@ pub use self::system::System;
/// # Panics
///
/// This function panics if actix system is not running.
#[inline]
pub fn spawn<F>(f: F)
where
F: futures_util::future::Future<Output = ()> + 'static,
F: Future<Output = ()> + 'static,
{
if !System::is_set() {
panic!("System is not running");
}
Arbiter::spawn(f);
Arbiter::spawn(f)
}
/// Asynchronous signal handling

6
actix-rt/src/runtime.rs
View File

@ -30,6 +30,10 @@ impl Runtime {
})
}
pub(super) fn local(&self) -> &LocalSet {
&self.local
}
/// Spawn a future onto the single-threaded runtime.
///
/// See [module level][mod] documentation for more details.
@ -84,7 +88,7 @@ impl Runtime {
/// complete execution by calling `block_on` or `run`.
pub fn block_on<F>(&mut self, f: F) -> F::Output
where
F: Future + 'static,
F: Future,
{
self.local.block_on(&mut self.rt, f)
}

2
actix-rt/src/system.rs
View File

@ -256,7 +256,7 @@ impl System {
/// Function `f` get called within tokio runtime context.
pub fn run<F>(f: F) -> io::Result<()>
where
F: FnOnce() + 'static,
F: FnOnce(),
{
Self::builder().run(f)
}

102
actix-rt/tests/integration_tests.rs
View File

@ -1,19 +1,5 @@
use std::time::{Duration, Instant};
#[test]
fn start_and_stop() {
actix_rt::System::new("start_and_stop").block_on(async move {
assert!(
actix_rt::Arbiter::is_running(),
"System doesn't seem to have started"
);
});
assert!(
!actix_rt::Arbiter::is_running(),
"System doesn't seem to have stopped"
);
}
#[test]
fn await_for_timer() {
let time = Duration::from_secs(2);
@ -76,39 +62,65 @@ fn join_another_arbiter() {
);
}
// #[test]
// fn join_current_arbiter() {
// let time = Duration::from_secs(2);
//
// let instant = Instant::now();
// actix_rt::System::new("test_join_current_arbiter").block_on(async move {
// actix_rt::spawn(async move {
// tokio::time::delay_for(time).await;
// actix_rt::Arbiter::current().stop();
// });
// actix_rt::Arbiter::local_join().await;
// });
// assert!(
// instant.elapsed() >= time,
// "Join on current arbiter should wait for all spawned futures"
// );
//
// let large_timer = Duration::from_secs(20);
// let instant = Instant::now();
// actix_rt::System::new("test_join_current_arbiter").block_on(async move {
// actix_rt::spawn(async move {
// tokio::time::delay_for(time).await;
// actix_rt::Arbiter::current().stop();
// });
// let f = actix_rt::Arbiter::local_join();
// actix_rt::spawn(async move {
// tokio::time::delay_for(large_timer).await;
// actix_rt::Arbiter::current().stop();
// });
// f.await;
// });
// assert!(
// instant.elapsed() < large_timer,
// "local_join should await only for the already spawned futures"
// );
// }
#[test]
fn join_current_arbiter() {
let time = Duration::from_secs(2);
fn non_static_block_on() {
let string = String::from("test_str");
let str = string.as_str();
let instant = Instant::now();
actix_rt::System::new("test_join_current_arbiter").block_on(async move {
actix_rt::spawn(async move {
tokio::time::delay_for(time).await;
actix_rt::Arbiter::current().stop();
});
actix_rt::Arbiter::local_join().await;
});
assert!(
instant.elapsed() >= time,
"Join on current arbiter should wait for all spawned futures"
);
let mut sys = actix_rt::System::new("borrow some");
let large_timer = Duration::from_secs(20);
let instant = Instant::now();
actix_rt::System::new("test_join_current_arbiter").block_on(async move {
actix_rt::spawn(async move {
tokio::time::delay_for(time).await;
actix_rt::Arbiter::current().stop();
});
let f = actix_rt::Arbiter::local_join();
actix_rt::spawn(async move {
tokio::time::delay_for(large_timer).await;
actix_rt::Arbiter::current().stop();
});
f.await;
sys.block_on(async {
actix_rt::time::delay_for(Duration::from_millis(1)).await;
assert_eq!("test_str", str);
});
assert!(
instant.elapsed() < large_timer,
"local_join should await only for the already spawned futures"
);
let mut rt = actix_rt::Runtime::new().unwrap();
rt.block_on(async {
actix_rt::time::delay_for(Duration::from_millis(1)).await;
assert_eq!("test_str", str);
});
actix_rt::System::run(|| {
assert_eq!("test_str", str);
actix_rt::System::current().stop();
})
.unwrap();
}

107
actix-server/tests/test_server.rs
View File

@ -22,13 +22,16 @@ fn test_bind() {
let (tx, rx) = mpsc::channel();
let h = thread::spawn(move || {
let sys = actix_rt::System::new("test");
let srv = Server::build()
.workers(1)
.disable_signals()
.bind("test", addr, move || fn_service(|_| ok::<_, ()>(())))
.unwrap()
.start();
let mut sys = actix_rt::System::new("test");
let srv = sys.block_on(lazy(|_| {
Server::build()
.workers(1)
.disable_signals()
.bind("test", addr, move || fn_service(|_| ok::<_, ()>(())))
.unwrap()
.start()
}));
let _ = tx.send((srv, actix_rt::System::current()));
let _ = sys.run();
});
@ -46,14 +49,16 @@ fn test_listen() {
let (tx, rx) = mpsc::channel();
let h = thread::spawn(move || {
let sys = actix_rt::System::new("test");
let mut sys = actix_rt::System::new("test");
let lst = net::TcpListener::bind(addr).unwrap();
Server::build()
.disable_signals()
.workers(1)
.listen("test", lst, move || fn_service(|_| ok::<_, ()>(())))
.unwrap()
.start();
sys.block_on(lazy(|_| {
Server::build()
.disable_signals()
.workers(1)
.listen("test", lst, move || fn_service(|_| ok::<_, ()>(())))
.unwrap()
.start()
}));
let _ = tx.send(actix_rt::System::current());
let _ = sys.run();
});
@ -78,19 +83,21 @@ fn test_start() {
let (tx, rx) = mpsc::channel();
let h = thread::spawn(move || {
let sys = actix_rt::System::new("test");
let srv: Server = Server::build()
.backlog(100)
.disable_signals()
.bind("test", addr, move || {
fn_service(|io: TcpStream| async move {
let mut f = Framed::new(io, BytesCodec);
f.send(Bytes::from_static(b"test")).await.unwrap();
Ok::<_, ()>(())
let mut sys = actix_rt::System::new("test");
let srv = sys.block_on(lazy(|_| {
Server::build()
.backlog(100)
.disable_signals()
.bind("test", addr, move || {
fn_service(|io: TcpStream| async move {
let mut f = Framed::new(io, BytesCodec);
f.send(Bytes::from_static(b"test")).await.unwrap();
Ok::<_, ()>(())
})
})
})
.unwrap()
.start();
.unwrap()
.start()
}));
let _ = tx.send((srv, actix_rt::System::current()));
let _ = sys.run();
@ -144,29 +151,31 @@ fn test_configure() {
let h = thread::spawn(move || {
let num = num2.clone();
let sys = actix_rt::System::new("test");
let srv = Server::build()
.disable_signals()
.configure(move |cfg| {
let num = num.clone();
let lst = net::TcpListener::bind(addr3).unwrap();
cfg.bind("addr1", addr1)
.unwrap()
.bind("addr2", addr2)
.unwrap()
.listen("addr3", lst)
.apply(move |rt| {
let num = num.clone();
rt.service("addr1", fn_service(|_| ok::<_, ()>(())));
rt.service("addr3", fn_service(|_| ok::<_, ()>(())));
rt.on_start(lazy(move |_| {
let _ = num.fetch_add(1, Relaxed);
}))
})
})
.unwrap()
.workers(1)
.start();
let mut sys = actix_rt::System::new("test");
let srv = sys.block_on(lazy(|_| {
Server::build()
.disable_signals()
.configure(move |cfg| {
let num = num.clone();
let lst = net::TcpListener::bind(addr3).unwrap();
cfg.bind("addr1", addr1)
.unwrap()
.bind("addr2", addr2)
.unwrap()
.listen("addr3", lst)
.apply(move |rt| {
let num = num.clone();
rt.service("addr1", fn_service(|_| ok::<_, ()>(())));
rt.service("addr3", fn_service(|_| ok::<_, ()>(())));
rt.on_start(lazy(move |_| {
let _ = num.fetch_add(1, Relaxed);
}))
})
})
.unwrap()
.workers(1)
.start()
}));
let _ = tx.send((srv, actix_rt::System::current()));
let _ = sys.run();
});

15
actix-testing/src/lib.rs
View File

@ -83,15 +83,18 @@ impl TestServer {
// run server in separate thread
thread::spawn(move || {
let sys = System::new("actix-test-server");
let mut sys = System::new("actix-test-server");
let tcp = net::TcpListener::bind("127.0.0.1:0").unwrap();
let local_addr = tcp.local_addr().unwrap();
Server::build()
.listen("test", tcp, factory)?
.workers(1)
.disable_signals()
.start();
sys.block_on(async {
Server::build()
.listen("test", tcp, factory)
.unwrap()
.workers(1)
.disable_signals()
.start();
});
tx.send((System::current(), local_addr)).unwrap();
sys.run()