1 files changed, 76 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch20-web-server/listing-20-18/src/lib.rs b/src/doc/book/listings/ch20-web-server/listing-20-18/src/lib.rs
new file mode 100644
index 000000000..4bff8acad
--- /dev/null
+++ b/src/doc/book/listings/ch20-web-server/listing-20-18/src/lib.rs
@@ -0,0 +1,76 @@
+// ANCHOR: here
+use std::{
+    sync::{mpsc, Arc, Mutex},
+    thread,
+};
+// --snip--
+
+// ANCHOR_END: here
+pub struct ThreadPool {
+    workers: Vec<Worker>,
+    sender: mpsc::Sender<Job>,
+}
+
+struct Job;
+
+// ANCHOR: here
+impl ThreadPool {
+    // --snip--
+    // ANCHOR_END: here
+    /// Create a new ThreadPool.
+    ///
+    /// The size is the number of threads in the pool.
+    ///
+    /// # Panics
+    ///
+    /// The `new` function will panic if the size is zero.
+    // ANCHOR: here
+    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 }
+    }
+
+    // --snip--
+    // ANCHOR_END: here
+
+    pub fn execute<F>(&self, f: F)
+    where
+        F: FnOnce() + Send + 'static,
+    {
+    }
+    // ANCHOR: here
+}
+
+// --snip--
+
+// ANCHOR_END: here
+struct Worker {
+    id: usize,
+    thread: thread::JoinHandle<()>,
+}
+
+// ANCHOR: here
+impl Worker {
+    fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Job>>>) -> Worker {
+        // --snip--
+        // ANCHOR_END: here
+        let thread = thread::spawn(|| {
+            receiver;
+        });
+
+        Worker { id, thread }
+        // ANCHOR: here
+    }
+}
+// ANCHOR_END: here