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-rwxr-xr-xrust-book/hello_server/src/lib.rs117
1 files changed, 117 insertions, 0 deletions
diff --git a/rust-book/hello_server/src/lib.rs b/rust-book/hello_server/src/lib.rs
new file mode 100755
index 0000000..cd1f616
--- /dev/null
+++ b/rust-book/hello_server/src/lib.rs
@@ -0,0 +1,117 @@
+use std::sync::Arc;
+use std::sync::Mutex;
+use std::sync::mpsc;
+use std::thread;
+
+enum Message {
+ NewJob(Job),
+ Terminate,
+}
+
+trait FnBox {
+ fn call_box(self: Box<Self>);
+}
+
+impl <F: FnOnce()> FnBox for F {
+ fn call_box(self: Box<F>) {
+ (*self)()
+ }
+}
+
+type Job = Box<FnBox + Send + 'static>;
+
+pub struct ThreadPool {
+ workers: Vec<Worker>,
+ sender: mpsc::Sender<Message>,
+}
+
+impl ThreadPool {
+ pub fn new(size: usize) -> Result<ThreadPool, &'static str> {
+ if size <= 0 {
+ return Err("failed to create pool");
+ }
+
+ 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))?);
+ }
+
+ Ok(ThreadPool {
+ workers,
+ sender,
+ })
+ }
+
+ pub fn spawn<F, T>(f: F) -> thread::JoinHandle<T>
+ where
+ F: FnOnce() -> T + Send + 'static,
+ T: Send + 'static
+ {
+ thread::spawn(f)
+ }
+
+ pub fn execute<F>(&self, f: F)
+ where
+ F: FnOnce() + Send + 'static
+ {
+ let job = Box::new(f);
+ self.sender.send(Message::NewJob(job)).unwrap();
+ }
+
+}
+
+impl Drop for ThreadPool {
+ fn drop(&mut self) {
+ for _ in &mut self.workers {
+ self.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 {
+ pub fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>)
+ -> Result<Worker, &'static str>
+ {
+ let thread = thread::spawn(move || {
+ loop {
+ let message = receiver.lock().unwrap().recv().unwrap();
+
+ match message {
+ Message::NewJob(job) => {
+ println!("worker {} got job, executing...", id);
+ job.call_box();
+ },
+ Message::Terminate => {
+ println!("worker {} was told to terminate...", id);
+ break;
+ },
+ }
+ }
+ });
+
+ Ok(Worker {
+ id,
+ thread: Some(thread),
+ })
+ }
+}