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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
use tokio::net::TcpListener;
use tokio::runtime;
use tokio_test::{assert_ok, assert_pending};
use futures::task::{waker_ref, ArcWake};
use std::future::Future;
use std::net::TcpStream;
use std::pin::Pin;
use std::sync::{mpsc, Arc, Mutex};
use std::task::Context;
struct Task<T> {
future: Mutex<Pin<Box<T>>>,
}
impl<T: Send> ArcWake for Task<T> {
fn wake_by_ref(_: &Arc<Self>) {
// Do nothing...
}
}
impl<T> Task<T> {
fn new(future: T) -> Task<T> {
Task {
future: Mutex::new(Box::pin(future)),
}
}
}
#[test]
fn test_drop_on_notify() {
// When the reactor receives a kernel notification, it notifies the
// task that holds the associated socket. If this notification results in
// the task being dropped, the socket will also be dropped.
//
// Previously, there was a deadlock scenario where the reactor, while
// notifying, held a lock and the task being dropped attempted to acquire
// that same lock in order to clean up state.
//
// To simulate this case, we create a fake executor that does nothing when
// the task is notified. This simulates an executor in the process of
// shutting down. Then, when the task handle is dropped, the task itself is
// dropped.
let rt = runtime::Builder::new_current_thread()
.enable_all()
.build()
.unwrap();
let (addr_tx, addr_rx) = mpsc::channel();
// Define a task that just drains the listener
let task = Arc::new(Task::new(async move {
// Create a listener
let listener = assert_ok!(TcpListener::bind("127.0.0.1:0").await);
// Send the address
let addr = listener.local_addr().unwrap();
addr_tx.send(addr).unwrap();
loop {
let _ = listener.accept().await;
}
}));
{
let _enter = rt.enter();
let waker = waker_ref(&task);
let mut cx = Context::from_waker(&waker);
assert_pending!(task.future.lock().unwrap().as_mut().poll(&mut cx));
}
// Get the address
let addr = addr_rx.recv().unwrap();
drop(task);
// Establish a connection to the acceptor
let _s = TcpStream::connect(&addr).unwrap();
// Force the reactor to turn
rt.block_on(async {});
}
#[test]
#[should_panic(
expected = "A Tokio 1.x context was found, but IO is disabled. Call `enable_io` on the runtime builder to enable IO."
)]
fn panics_when_io_disabled() {
let rt = runtime::Builder::new_current_thread().build().unwrap();
rt.block_on(async {
let _ =
tokio::net::TcpListener::from_std(std::net::TcpListener::bind("127.0.0.1:0").unwrap());
});
}
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