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new file mode 100644
index 0000000000000000000000000000000000000000..426d5edea5ad8a854b57bc0ff026682ee3f0151d
--- /dev/null
+++ b/exemples/coroutines_better/Cargo.lock
@@ -0,0 +1,113 @@
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+# It is not intended for manual editing.
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diff --git a/exemples/coroutines_better/Cargo.toml b/exemples/coroutines_better/Cargo.toml
new file mode 100644
index 0000000000000000000000000000000000000000..8318b4d300019db0845503d46a6eb36e62845bf1
--- /dev/null
+++ b/exemples/coroutines_better/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "coroutines_better"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+mio = { version = "1.0.3", features = ["net", "os-poll"] }
diff --git a/exemples/coroutines_better/src/future.rs b/exemples/coroutines_better/src/future.rs
new file mode 100644
index 0000000000000000000000000000000000000000..40ec06d25678af28fdae86160f9d8a972a2b2da5
--- /dev/null
+++ b/exemples/coroutines_better/src/future.rs
@@ -0,0 +1,20 @@
+// Future trait looks like standard Future except for the missing context
+// pub trait Future {
+// type Output;
+// fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>;
+//}
+pub trait Future {
+ type Output;
+
+ fn poll(&mut self) -> PollState<Self::Output>;
+}
+
+// Similar to the Poll #[derive(Debug)]
+// pub enum Poll<T> {
+// Ready(T),
+// Pending,
+// }
+pub enum PollState<T> {
+ Ready(T),
+ NotReady,
+}
diff --git a/exemples/coroutines_better/src/http.rs b/exemples/coroutines_better/src/http.rs
new file mode 100644
index 0000000000000000000000000000000000000000..77372b2ab20064fc33ef1f39dc7429ebae3e326a
--- /dev/null
+++ b/exemples/coroutines_better/src/http.rs
@@ -0,0 +1,80 @@
+use mio::{Interest, Token};
+
+use crate::future::{Future, PollState};
+use crate::runtime;
+use std::io::{ErrorKind, Read, Write};
+
+fn get_req(path: &str) -> String {
+ format!(
+ "GET {path} HTTP/1.1\r\n\
+ Host: localhost\r\n\
+ Connection: close\r\n\
+ \r\n"
+ )
+}
+
+pub struct Http;
+
+impl Http {
+ pub fn get(path: &str) -> impl Future<Output = String> {
+ HttpGetFuture::new(path)
+ }
+}
+
+struct HttpGetFuture {
+ stream: Option<mio::net::TcpStream>,
+ buffer: Vec<u8>,
+ path: String,
+}
+
+impl HttpGetFuture {
+ fn new(path: &str) -> Self {
+ Self {
+ stream: None,
+ buffer: vec![],
+ path: String::from(path),
+ }
+ }
+
+ fn write_request(&mut self) {
+ let stream = std::net::TcpStream::connect("localhost:8080").unwrap();
+ stream.set_nonblocking(true).unwrap();
+ let mut stream = mio::net::TcpStream::from_std(stream);
+ stream.write_all(get_req(&self.path).as_bytes()).unwrap();
+ self.stream = Some(stream);
+ }
+}
+
+impl Future for HttpGetFuture {
+ type Output = String;
+
+ fn poll(&mut self) -> PollState<Self::Output> {
+ if self.stream.is_none() {
+ println!("First poll - start operation");
+ self.write_request();
+ // 1. Registering the Tcp stream as a source of events in the poll instance
+ // 2. On retourne pas encore NotReady mais on essaie de lire le stream directement
+ }
+ let mut buf = vec![0u8; 4096];
+ loop {
+ match self.stream.as_mut().unwrap().read(&mut buf) {
+ Ok(0) => {
+ let s = String::from_utf8_lossy(&self.buffer);
+ break PollState::Ready(String::from(s));
+ }
+ Ok(n) => {
+ self.buffer.extend(&buf[0..n]);
+ continue;
+ }
+ Err(e) if e.kind() == ErrorKind::WouldBlock => {
+ println!("Data not ready");
+ break PollState::NotReady;
+ }
+ Err(e) if e.kind() == ErrorKind::Interrupted => {
+ continue;
+ }
+ Err(e) => panic!("{e:?}"),
+ }
+ }
+ }
+}
diff --git a/exemples/coroutines_better/src/main.rs b/exemples/coroutines_better/src/main.rs
new file mode 100644
index 0000000000000000000000000000000000000000..ac1fdc2670df8ace39aa641968d10e50a8a06a9f
--- /dev/null
+++ b/exemples/coroutines_better/src/main.rs
@@ -0,0 +1,87 @@
+mod future;
+mod http;
+mod runtime;
+
+use future::{Future, PollState};
+use http::Http;
+use runtime::Runtime;
+
+fn main() {
+ let future = async_main();
+ let mut runtime = Runtime::new();
+ runtime.block_on(future);
+}
+
+// =================================
+// We rewrite this:
+// =================================
+// coroutine fn async_main() -> impl Future<Output = String> {
+// println!("Program starting");
+// let txt = Http::get("/600/HelloAsyncAwait").wait;
+// println!("{txt}");
+// let txt = Http::get("/400/HelloAsyncAwait").wait;
+// println!("{txt}");
+// }
+
+// =================================
+// Into this:
+// =================================
+
+fn async_main() -> impl Future<Output = String> {
+ Coroutine::new()
+}
+
+enum State {
+ Start,
+ Wait1(Box<dyn Future<Output = String>>),
+ Wait2(Box<dyn Future<Output = String>>),
+ Resolved,
+}
+
+struct Coroutine {
+ state: State,
+}
+
+impl Coroutine {
+ fn new() -> Self {
+ Self {
+ state: State::Start,
+ }
+ }
+}
+
+impl Future for Coroutine {
+ type Output = String;
+
+ fn poll(&mut self) -> PollState<Self::Output> {
+ loop {
+ match self.state {
+ State::Start => {
+ println!("Program starting");
+ let fut1 = Box::new(Http::get("/600/HelloAsyncAwait"));
+ self.state = State::Wait1(fut1);
+ }
+
+ State::Wait1(ref mut future) => match future.poll() {
+ PollState::Ready(txt) => {
+ println!("{txt}");
+ let fut2 = Box::new(Http::get("/400/HelloAsyncAwait"));
+ self.state = State::Wait2(fut2);
+ }
+ PollState::NotReady => break PollState::NotReady,
+ },
+
+ State::Wait2(ref mut future) => match future.poll() {
+ PollState::Ready(txt) => {
+ println!("{txt}");
+ self.state = State::Resolved;
+ break PollState::Ready(String::new());
+ }
+ PollState::NotReady => break PollState::NotReady,
+ },
+
+ State::Resolved => panic!("Polled a resolved future"),
+ }
+ }
+ }
+}
diff --git a/exemples/coroutines_better/src/runtime.rs b/exemples/coroutines_better/src/runtime.rs
new file mode 100644
index 0000000000000000000000000000000000000000..88b8e7f053f232363686cb2bfe6266055d549cd8
--- /dev/null
+++ b/exemples/coroutines_better/src/runtime.rs
@@ -0,0 +1,34 @@
+use std::sync::OnceLock;
+
+use mio::{Events, Poll, Registry};
+
+use crate::future::{Future, PollState};
+
+static REGISTRY: OnceLock<Registry> = OnceLock::new();
+pub fn registry() -> &'static Registry {
+ REGISTRY.get().expect("Called outside a runtime context")
+}
+
+pub struct Runtime {
+ poll: Poll,
+}
+
+impl Runtime {
+ pub fn new() -> Self {
+ // 1. creation d'une nouvelle instance de Poll
+ // 2. try_clone() du registry associé pour pouvoir ajouter une source plus tard
+ // 3. set() le registry au REGISTRY
+ // 4. return d'une nouvelle install avec le poll associé
+ unimplemented!()
+ }
+
+ pub fn block_on<F>(&mut self, future: F)
+ where
+ F: Future<Output = String>,
+ {
+ // 1. future -> mut future
+ // 2. tant que future.poll() n'est pas Ready poll.poll() un mut Event
+ // 3. Voilà
+ unimplemented!()
+ }
+}