codespaces devcontainer

.devcontainer/devcontainer.json

@@ -0,0 +1,29 @@
+{
+  "name": "Rust Workshop",
+  "image": "mcr.microsoft.com/devcontainers/rust:1-bullseye",
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "rust-lang.rust-analyzer",
+        "vadimcn.vscode-lldb",
+        "tamasfe.even-better-toml",
+        "humao.rest-client"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "rust-analyzer.check.command": "clippy"
+      }
+    }
+  },
+  "postCreateCommand": "cargo build",
+  "forwardPorts": [7878],
+  "portsAttributes": {
+    "7878": {
+      "label": "HTTP Server",
+      "onAutoForward": "notify"
+    }
+  }
+}

src/main.rs

@@ -1,12 +1,31 @@
 use log::info;
 use std::io::{Read, Write};
 use std::net::{TcpListener, TcpStream};
-use std::thread;
+use std::sync::{Arc, Mutex, mpsc};
+use std::{sync, thread};
 
 static GET: &'static [u8] = b"GET / HTTP/1.1\r\n";
 
+struct Worker {
+    id: usize,
+    thread: thread::JoinHandle<()>,
+}
+
+impl Worker {
+    fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>) -> Worker {
+        let thread = thread::spawn(move || {
+            loop {
+                let job = receiver.lock().unwrap().recv().unwrap();
+                job();
+            }
+        });
+        Worker { id, thread }
+    }
+}
+
 pub struct ThreadPool {
-    threads: Vec<thread::JoinHandle<()>>,
+    workers: Vec<Worker>,
+    sender: mpsc::Sender<Job>,
 }
 
 impl ThreadPool {
@@ -17,14 +36,25 @@ impl ThreadPool {
     /// The `new` function panics if the size is zero
     pub fn new(size: usize) -> Self {
         assert!(size > 0);
-        let threads = Vec::with_capacity(size);
+        let mut workers = Vec::with_capacity(size);
-        for _ in 0..size {
+        let (sender, receiver) = mpsc::channel();
-
+        let receiver = Arc::new(Mutex::new(receiver));
+        for id in 0..size {
+            workers.push(Worker::new(id, Arc::clone(&receiver)))
         }
-        Self {threads}
+        Self { workers, sender }
     }
 
+    pub fn execute<F>(&self, f: F)
+    where
+        F: FnOnce() + Send + 'static,
+    {
+        let job = Box::new(f);
+        self.sender.send(job).unwrap();
     }
+}
+
+type Job = Box<dyn FnOnce() + Send + 'static>;
 
 fn main() -> std::io::Result<()> {
     env_logger::init();
@@ -32,9 +62,7 @@ fn main() -> std::io::Result<()> {
     let pool = ThreadPool::new(4);
     for stream in listener.incoming() {
         let stream = stream?;
-        thread::spawn(|| {
+        pool.execute(|| handle_connection(stream).unwrap());
-            handle_connection(stream).unwrap();
-        });
     }
     Ok(())
 }