yeah we rusty

Cargo.toml

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+[package]
+name = "playground-rs"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/main.rs

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+mod server;
+mod thread_pool;
+
+use server::run;
+
+fn main() {
+    run();
+}

src/server.rs

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+use std::net::{TcpListener, TcpStream};
+use std::io::prelude::*;
+
+use crate::thread_pool::ThreadPool;
+
+pub fn run() {
+    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
+    let pool = ThreadPool::new(4);
+
+    for stream in listener.incoming() {
+        let stream = stream.unwrap();
+        pool.execute(|| {
+            handle_execution(stream);
+        });
+    }
+}
+
+fn handle_execution(mut stream: TcpStream) {
+    let mut buffer = [0; 512];
+    stream.read(&mut buffer).unwrap();
+
+    let response = "HTTP/1.1 200 OK\r\nContent-Length: 13\r\n\r\nHello, world!";
+    stream.write(response.as_bytes()).unwrap();
+    stream.flush().unwrap();
+}

src/thread_pool.rs

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+use std::thread;
+use std::sync::{mpsc, Arc, Mutex};
+
+pub struct ThreadPool {
+    workers: Vec<Worker>,
+    sender: Option<mpsc::Sender<Message>>,
+}
+
+type Job = Box<dyn FnOnce() + Send + 'static>;
+
+enum Message {
+    NewJob(Job),
+    Terminate,
+}
+
+impl ThreadPool {
+    pub fn new(size: usize) -> ThreadPool {
+        assert!(size > 0);
+
+        let (sender, receiver) = mpsc::channel();
+        let receiver = Arc::new(Mutex::new(receiver));
+
+        let mut workers = Vec::with_capacity(size);
+
+        for id in 0..size {
+            workers.push(Worker::new(id, Arc::clone(&receiver)));
+        }
+
+        ThreadPool {
+            workers,
+            sender: Some(sender),
+        }
+    }
+
+    pub fn execute<F>(&self, f: F)
+    where
+        F: FnOnce() + Send + 'static,
+    {
+        if let Some(sender) = &self.sender {
+            sender.send(Message::NewJob(Box::new(f))).unwrap();
+        }
+    }
+}
+
+impl Drop for ThreadPool {
+    fn drop(&mut self) {
+        println!("Sending terminate message to all workers.");
+
+        // Send a terminate message to each worker
+        if let Some(sender) = self.sender.take() {
+            for _ in &self.workers {
+                sender.send(Message::Terminate).unwrap();
+            }
+        }
+
+        println!("Shutting down all workers.");
+
+        for worker in &mut self.workers {
+            println!("Shutting down worker {}", worker.id);
+
+            if let Some(thread) = worker.thread.take() {
+                thread.join().unwrap();
+            }
+        }
+    }
+}
+
+struct Worker {
+    id: usize,
+    thread: Option<thread::JoinHandle<()>>,
+}
+
+impl Worker {
+    fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker {
+        let thread = thread::spawn(move || loop {
+            let message = receiver.lock().unwrap().recv().unwrap();
+
+            match message {
+                Message::NewJob(job) => {
+                    println!("Worker {id} got a job; executing.");
+                    job();
+                }
+                Message::Terminate => {
+                    println!("Worker {id} was told to terminate.");
+                    break;
+                }
+            }
+        });
+
+        Worker {
+            id,
+            thread: Some(thread),
+        }
+    }
+}