mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-08-22 00:00:11 +02:00
executor: move current-thread into crate (#1447)
The `CurrentThread` executor is exposed using a feature flag. Refs: #1264
This commit is contained in:
Carl Lerche
@@ -0,0 +1,778 @@
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#![warn(rust_2018_idioms)]
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#![feature(async_await)]
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use tokio::sync::oneshot;
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use tokio_executor::current_thread::{self, block_on_all, CurrentThread, TaskExecutor};
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use tokio_executor::TypedExecutor;
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use std::any::Any;
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use std::cell::{Cell, RefCell};
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use std::future::Future;
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use std::pin::Pin;
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use std::rc::Rc;
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use std::task::{Context, Poll};
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use std::thread;
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use std::time::Duration;
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mod from_block_on_all {
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use super::*;
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fn test<F: Fn(Pin<Box<dyn Future<Output = ()>>>) + 'static>(spawn: F) {
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let cnt = Rc::new(Cell::new(0));
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let c = cnt.clone();
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let msg = block_on_all(async move {
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c.set(1 + c.get());
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// Spawn!
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spawn(Box::pin(async move {
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c.set(1 + c.get());
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}));
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"hello"
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});
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assert_eq!(2, cnt.get());
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assert_eq!(msg, "hello");
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn)
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}
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#[test]
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fn execute() {
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test(|f| {
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TaskExecutor::current().spawn(f).unwrap();
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});
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}
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}
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#[test]
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fn block_waits() {
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let (tx, rx) = oneshot::channel();
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thread::spawn(|| {
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thread::sleep(Duration::from_millis(1000));
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tx.send(()).unwrap();
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});
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let cnt = Rc::new(Cell::new(0));
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let cnt2 = cnt.clone();
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block_on_all(async move {
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rx.await.unwrap();
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cnt.set(1 + cnt.get());
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});
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assert_eq!(1, cnt2.get());
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}
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#[test]
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fn spawn_many() {
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const ITER: usize = 200;
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let cnt = Rc::new(Cell::new(0));
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let mut tokio_current_thread = CurrentThread::new();
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for _ in 0..ITER {
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let cnt = cnt.clone();
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tokio_current_thread.spawn(async move {
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cnt.set(1 + cnt.get());
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});
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}
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tokio_current_thread.run().unwrap();
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assert_eq!(cnt.get(), ITER);
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}
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mod does_not_set_global_executor_by_default {
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use super::*;
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fn test<F: Fn(Pin<Box<dyn Future<Output = ()> + Send>>) -> Result<(), E> + 'static, E>(
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spawn: F,
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) {
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block_on_all(async {
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spawn(Box::pin(async {})).unwrap_err();
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});
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}
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#[test]
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fn spawn() {
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test(|f| tokio_executor::DefaultExecutor::current().spawn(f))
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}
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}
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mod from_block_on_future {
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use super::*;
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fn test<F: Fn(Pin<Box<dyn Future<Output = ()>>>)>(spawn: F) {
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let cnt = Rc::new(Cell::new(0));
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let cnt2 = cnt.clone();
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let mut tokio_current_thread = CurrentThread::new();
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tokio_current_thread.block_on(async move {
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let cnt3 = cnt2.clone();
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spawn(Box::pin(async move {
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cnt3.set(1 + cnt3.get());
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}));
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});
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tokio_current_thread.run().unwrap();
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assert_eq!(1, cnt.get());
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn);
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}
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#[test]
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fn execute() {
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test(|f| {
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current_thread::TaskExecutor::current().spawn(f).unwrap();
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});
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}
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}
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mod outstanding_tasks_are_dropped_when_executor_is_dropped {
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use super::*;
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async fn never(_rc: Rc<()>) {
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loop {
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yield_once().await;
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}
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}
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fn test<F, G>(spawn: F, dotspawn: G)
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where
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F: Fn(Pin<Box<dyn Future<Output = ()>>>) + 'static,
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G: Fn(&mut CurrentThread, Pin<Box<dyn Future<Output = ()>>>),
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{
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let mut rc = Rc::new(());
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let mut tokio_current_thread = CurrentThread::new();
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dotspawn(&mut tokio_current_thread, Box::pin(never(rc.clone())));
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drop(tokio_current_thread);
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// Ensure the daemon is dropped
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assert!(Rc::get_mut(&mut rc).is_some());
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// Using the global spawn fn
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let mut rc = Rc::new(());
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let rc2 = rc.clone();
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let mut tokio_current_thread = CurrentThread::new();
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tokio_current_thread.block_on(async move {
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spawn(Box::pin(never(rc2)));
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});
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drop(tokio_current_thread);
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// Ensure the daemon is dropped
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assert!(Rc::get_mut(&mut rc).is_some());
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn, |rt, f| {
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rt.spawn(f);
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})
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}
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#[test]
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fn execute() {
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test(
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|f| {
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current_thread::TaskExecutor::current().spawn(f).unwrap();
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},
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// Note: `CurrentThread` doesn't currently implement
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// `futures::Executor`, so we'll call `.spawn(...)` rather than
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// `.execute(...)` for now. If `CurrentThread` is changed to
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// implement Executor, change this to `.execute(...).unwrap()`.
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|rt, f| {
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rt.spawn(f);
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},
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);
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}
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}
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#[test]
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#[should_panic]
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fn nesting_run() {
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block_on_all(async {
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block_on_all(async {});
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});
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}
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mod run_in_future {
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use super::*;
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#[test]
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#[should_panic]
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fn spawn() {
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block_on_all(async {
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current_thread::spawn(async {
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block_on_all(async {});
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});
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});
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}
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#[test]
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#[should_panic]
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fn execute() {
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block_on_all(async {
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current_thread::TaskExecutor::current()
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.spawn(async {
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block_on_all(async {});
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})
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.unwrap();
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});
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}
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}
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#[test]
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fn tick_on_infini_future() {
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let num = Rc::new(Cell::new(0));
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async fn infini(num: Rc<Cell<usize>>) {
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loop {
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num.set(1 + num.get());
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yield_once().await
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}
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}
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CurrentThread::new()
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.spawn(infini(num.clone()))
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.turn(None)
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.unwrap();
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assert_eq!(1, num.get());
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}
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mod tasks_are_scheduled_fairly {
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use super::*;
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async fn spin(state: Rc<RefCell<[i32; 2]>>, idx: usize) {
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loop {
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// borrow_mut scope
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{
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let mut state = state.borrow_mut();
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if idx == 0 {
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let diff = state[0] - state[1];
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assert!(diff.abs() <= 1);
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if state[0] >= 50 {
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return;
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}
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}
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state[idx] += 1;
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if state[idx] >= 100 {
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return;
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}
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}
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yield_once().await;
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}
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}
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fn test<F: Fn(Pin<Box<dyn Future<Output = ()>>>)>(spawn: F) {
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let state = Rc::new(RefCell::new([0, 0]));
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block_on_all(async move {
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spawn(Box::pin(spin(state.clone(), 0)));
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spawn(Box::pin(spin(state, 1)));
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});
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn)
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}
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#[test]
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fn execute() {
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test(|f| {
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current_thread::TaskExecutor::current().spawn(f).unwrap();
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})
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}
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}
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mod and_turn {
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use super::*;
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fn test<F, G>(spawn: F, dotspawn: G)
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where
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F: Fn(Pin<Box<dyn Future<Output = ()>>>) + 'static,
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G: Fn(&mut CurrentThread, Pin<Box<dyn Future<Output = ()>>>),
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{
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let cnt = Rc::new(Cell::new(0));
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let c = cnt.clone();
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let mut tokio_current_thread = CurrentThread::new();
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// Spawn a basic task to get the executor to turn
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dotspawn(&mut tokio_current_thread, Box::pin(async {}));
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// Turn once...
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tokio_current_thread.turn(None).unwrap();
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dotspawn(
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&mut tokio_current_thread,
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Box::pin(async move {
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c.set(1 + c.get());
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// Spawn!
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spawn(Box::pin(async move {
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c.set(1 + c.get());
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}));
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}),
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);
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// This does not run the newly spawned thread
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tokio_current_thread.turn(None).unwrap();
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assert_eq!(1, cnt.get());
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// This runs the newly spawned thread
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tokio_current_thread.turn(None).unwrap();
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assert_eq!(2, cnt.get());
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn, |rt, f| {
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rt.spawn(f);
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})
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}
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#[test]
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fn execute() {
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test(
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|f| {
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current_thread::TaskExecutor::current().spawn(f).unwrap();
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},
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// Note: `CurrentThread` doesn't currently implement
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// `futures::Executor`, so we'll call `.spawn(...)` rather than
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// `.execute(...)` for now. If `CurrentThread` is changed to
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// implement Executor, change this to `.execute(...).unwrap()`.
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|rt, f| {
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rt.spawn(f);
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},
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);
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}
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}
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mod in_drop {
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use super::*;
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struct OnDrop<F: FnOnce()>(Option<F>);
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impl<F: FnOnce()> Drop for OnDrop<F> {
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fn drop(&mut self) {
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(self.0.take().unwrap())();
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}
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}
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async fn noop(_data: Box<dyn Any>) {}
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fn test<F, G>(spawn: F, dotspawn: G)
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where
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F: Fn(Pin<Box<dyn Future<Output = ()>>>) + 'static,
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G: Fn(&mut CurrentThread, Pin<Box<dyn Future<Output = ()>>>),
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{
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let mut tokio_current_thread = CurrentThread::new();
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let (tx, rx) = oneshot::channel();
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dotspawn(
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&mut tokio_current_thread,
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Box::pin(noop(Box::new(OnDrop(Some(move || {
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spawn(Box::pin(async move {
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tx.send(()).unwrap();
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}));
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}))))),
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);
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tokio_current_thread.block_on(rx).unwrap();
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tokio_current_thread.run().unwrap();
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}
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#[test]
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fn spawn() {
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test(current_thread::spawn, |rt, f| {
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rt.spawn(f);
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})
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}
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#[test]
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fn execute() {
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test(
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|f| {
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current_thread::TaskExecutor::current().spawn(f).unwrap();
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},
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// Note: `CurrentThread` doesn't currently implement
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// `futures::Executor`, so we'll call `.spawn(...)` rather than
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// `.execute(...)` for now. If `CurrentThread` is changed to
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// implement Executor, change this to `.execute(...).unwrap()`.
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|rt, f| {
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rt.spawn(f);
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},
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);
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}
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}
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/*
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#[test]
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fn hammer_turn() {
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use futures::sync::mpsc;
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const ITER: usize = 100;
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const N: usize = 100;
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const THREADS: usize = 4;
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for _ in 0..ITER {
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let mut ths = vec![];
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// Add some jitter
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for _ in 0..THREADS {
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let th = thread::spawn(|| {
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let mut tokio_current_thread = CurrentThread::new();
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let (tx, rx) = mpsc::unbounded();
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tokio_current_thread.spawn({
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let cnt = Rc::new(Cell::new(0));
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let c = cnt.clone();
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rx.for_each(move |_| {
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c.set(1 + c.get());
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Ok(())
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})
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.map_err(|e| panic!("err={:?}", e))
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.map(move |v| {
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assert_eq!(N, cnt.get());
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v
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})
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});
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thread::spawn(move || {
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for _ in 0..N {
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tx.unbounded_send(()).unwrap();
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thread::yield_now();
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}
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});
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while !tokio_current_thread.is_idle() {
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tokio_current_thread.turn(None).unwrap();
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}
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});
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ths.push(th);
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}
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for th in ths {
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th.join().unwrap();
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}
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}
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}
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*/
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#[test]
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fn turn_has_polled() {
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let mut tokio_current_thread = CurrentThread::new();
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// Spawn oneshot receiver
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let (sender, receiver) = oneshot::channel::<()>();
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tokio_current_thread.spawn(async move {
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let _ = receiver.await;
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});
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// Turn once...
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let res = tokio_current_thread
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.turn(Some(Duration::from_millis(0)))
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.unwrap();
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// Should've polled the receiver once, but considered it not ready
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assert!(res.has_polled());
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// Turn another time
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let res = tokio_current_thread
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.turn(Some(Duration::from_millis(0)))
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.unwrap();
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// Should've polled nothing, the receiver is not ready yet
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assert!(!res.has_polled());
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// Make the receiver ready
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sender.send(()).unwrap();
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// Turn another time
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let res = tokio_current_thread
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.turn(Some(Duration::from_millis(0)))
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.unwrap();
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// Should've polled the receiver, it's ready now
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assert!(res.has_polled());
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// Now the executor should be empty
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assert!(tokio_current_thread.is_idle());
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let res = tokio_current_thread
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.turn(Some(Duration::from_millis(0)))
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.unwrap();
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// So should've polled nothing
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assert!(!res.has_polled());
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}
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|
||||
// Our own mock Park that is never really waiting and the only
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// thing it does is to send, on request, something (once) to a oneshot
|
||||
// channel
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||||
struct MyPark {
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||||
sender: Option<oneshot::Sender<()>>,
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||||
send_now: Rc<Cell<bool>>,
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||||
}
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||||
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||||
struct MyUnpark;
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||||
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||||
impl tokio_executor::park::Park for MyPark {
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type Unpark = MyUnpark;
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type Error = ();
|
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|
||||
fn unpark(&self) -> Self::Unpark {
|
||||
MyUnpark
|
||||
}
|
||||
|
||||
fn park(&mut self) -> Result<(), Self::Error> {
|
||||
// If called twice with send_now, this will intentionally panic
|
||||
if self.send_now.get() {
|
||||
self.sender.take().unwrap().send(()).unwrap();
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn park_timeout(&mut self, _duration: Duration) -> Result<(), Self::Error> {
|
||||
self.park()
|
||||
}
|
||||
}
|
||||
|
||||
impl tokio_executor::park::Unpark for MyUnpark {
|
||||
fn unpark(&self) {}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn turn_fair() {
|
||||
let send_now = Rc::new(Cell::new(false));
|
||||
|
||||
let (sender, receiver) = oneshot::channel::<()>();
|
||||
let (sender_2, receiver_2) = oneshot::channel::<()>();
|
||||
let (sender_3, receiver_3) = oneshot::channel::<()>();
|
||||
|
||||
let my_park = MyPark {
|
||||
sender: Some(sender_3),
|
||||
send_now: send_now.clone(),
|
||||
};
|
||||
|
||||
let mut tokio_current_thread = CurrentThread::new_with_park(my_park);
|
||||
|
||||
let receiver_1_done = Rc::new(Cell::new(false));
|
||||
let receiver_1_done_clone = receiver_1_done.clone();
|
||||
|
||||
// Once an item is received on the oneshot channel, it will immediately
|
||||
// immediately make the second oneshot channel ready
|
||||
|
||||
tokio_current_thread.spawn(async move {
|
||||
receiver.await.unwrap();
|
||||
sender_2.send(()).unwrap();
|
||||
receiver_1_done_clone.set(true);
|
||||
});
|
||||
|
||||
let receiver_2_done = Rc::new(Cell::new(false));
|
||||
let receiver_2_done_clone = receiver_2_done.clone();
|
||||
|
||||
tokio_current_thread.spawn(async move {
|
||||
receiver_2.await.unwrap();
|
||||
receiver_2_done_clone.set(true);
|
||||
});
|
||||
|
||||
// The third receiver is only woken up from our Park implementation, it simulates
|
||||
// e.g. a socket that first has to be polled to know if it is ready now
|
||||
let receiver_3_done = Rc::new(Cell::new(false));
|
||||
let receiver_3_done_clone = receiver_3_done.clone();
|
||||
|
||||
tokio_current_thread.spawn(async move {
|
||||
receiver_3.await.unwrap();
|
||||
receiver_3_done_clone.set(true);
|
||||
});
|
||||
|
||||
// First turn should've polled both and considered them not ready
|
||||
let res = tokio_current_thread
|
||||
.turn(Some(Duration::from_millis(0)))
|
||||
.unwrap();
|
||||
assert!(res.has_polled());
|
||||
|
||||
// Next turn should've polled nothing
|
||||
let res = tokio_current_thread
|
||||
.turn(Some(Duration::from_millis(0)))
|
||||
.unwrap();
|
||||
assert!(!res.has_polled());
|
||||
|
||||
assert!(!receiver_1_done.get());
|
||||
assert!(!receiver_2_done.get());
|
||||
assert!(!receiver_3_done.get());
|
||||
|
||||
// After this the receiver future will wake up the second receiver future,
|
||||
// so there are pending futures again
|
||||
sender.send(()).unwrap();
|
||||
|
||||
// Now the first receiver should be done, the second receiver should be ready
|
||||
// to be polled again and the socket not yet
|
||||
let res = tokio_current_thread.turn(None).unwrap();
|
||||
assert!(res.has_polled());
|
||||
|
||||
assert!(receiver_1_done.get());
|
||||
assert!(!receiver_2_done.get());
|
||||
assert!(!receiver_3_done.get());
|
||||
|
||||
// Now let our park implementation know that it should send something to sender 3
|
||||
send_now.set(true);
|
||||
|
||||
// This should resolve the second receiver directly, but also poll the socket
|
||||
// and read the packet from it. If it didn't do both here, we would handle
|
||||
// futures that are woken up from the reactor and directly unfairly and would
|
||||
// favour the ones that are woken up directly.
|
||||
let res = tokio_current_thread.turn(None).unwrap();
|
||||
assert!(res.has_polled());
|
||||
|
||||
assert!(receiver_1_done.get());
|
||||
assert!(receiver_2_done.get());
|
||||
assert!(receiver_3_done.get());
|
||||
|
||||
// Don't send again
|
||||
send_now.set(false);
|
||||
|
||||
// Now we should be idle and turning should not poll anything
|
||||
assert!(tokio_current_thread.is_idle());
|
||||
let res = tokio_current_thread.turn(None).unwrap();
|
||||
assert!(!res.has_polled());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn spawn_from_other_thread() {
|
||||
let mut current_thread = CurrentThread::new();
|
||||
|
||||
let handle = current_thread.handle();
|
||||
let (sender, receiver) = oneshot::channel::<()>();
|
||||
|
||||
thread::spawn(move || {
|
||||
handle
|
||||
.spawn(async move {
|
||||
sender.send(()).unwrap();
|
||||
})
|
||||
.unwrap();
|
||||
});
|
||||
|
||||
let _ = current_thread.block_on(receiver).unwrap();
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn spawn_from_other_thread_unpark() {
|
||||
use std::sync::mpsc::channel as mpsc_channel;
|
||||
|
||||
let mut current_thread = CurrentThread::new();
|
||||
|
||||
let handle = current_thread.handle();
|
||||
let (sender_1, receiver_1) = oneshot::channel::<()>();
|
||||
let (sender_2, receiver_2) = mpsc_channel::<()>();
|
||||
|
||||
thread::spawn(move || {
|
||||
let _ = receiver_2.recv().unwrap();
|
||||
|
||||
handle
|
||||
.spawn(async move {
|
||||
sender_1.send(()).unwrap();
|
||||
})
|
||||
.unwrap();
|
||||
});
|
||||
|
||||
// Ensure that unparking the executor works correctly. It will first
|
||||
// check if there are new futures (there are none), then execute the
|
||||
// lazy future below which will cause the future to be spawned from
|
||||
// the other thread. Then the executor will park but should be woken
|
||||
// up because *now* we have a new future to schedule
|
||||
let _ = current_thread.block_on(async move {
|
||||
// inlined 'lazy'
|
||||
async move {
|
||||
sender_2.send(()).unwrap();
|
||||
}
|
||||
.await;
|
||||
receiver_1.await.unwrap();
|
||||
});
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn spawn_from_executor_with_handle() {
|
||||
let mut current_thread = CurrentThread::new();
|
||||
let handle = current_thread.handle();
|
||||
let (tx, rx) = oneshot::channel();
|
||||
|
||||
current_thread.spawn(async move {
|
||||
handle
|
||||
.spawn(async move {
|
||||
tx.send(()).unwrap();
|
||||
})
|
||||
.unwrap();
|
||||
});
|
||||
|
||||
current_thread.block_on(rx).unwrap();
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn handle_status() {
|
||||
let current_thread = CurrentThread::new();
|
||||
let handle = current_thread.handle();
|
||||
assert!(handle.status().is_ok());
|
||||
|
||||
drop(current_thread);
|
||||
assert!(handle.spawn(async { () }).is_err());
|
||||
assert!(handle.status().is_err());
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn handle_is_sync() {
|
||||
let current_thread = CurrentThread::new();
|
||||
let handle = current_thread.handle();
|
||||
|
||||
let _box: Box<dyn Sync> = Box::new(handle);
|
||||
}
|
||||
|
||||
async fn yield_once() {
|
||||
YieldOnce(false).await
|
||||
}
|
||||
|
||||
struct YieldOnce(bool);
|
||||
|
||||
impl Future for YieldOnce {
|
||||
type Output = ();
|
||||
|
||||
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {
|
||||
if self.0 {
|
||||
Poll::Ready(())
|
||||
} else {
|
||||
self.0 = true;
|
||||
// Push to the back of the executor's queue
|
||||
cx.waker().wake_by_ref();
|
||||
Poll::Pending
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user