Update Exercises Directory Names to Reflect Order

exercises/20_threads/threads3.rs

@@ -0,0 +1,67 @@
+// threads3.rs
+//
+// Execute `rustlings hint threads3` or use the `hint` watch subcommand for a
+// hint.
+
+// I AM NOT DONE
+
+use std::sync::mpsc;
+use std::sync::Arc;
+use std::thread;
+use std::time::Duration;
+
+struct Queue {
+    length: u32,
+    first_half: Vec<u32>,
+    second_half: Vec<u32>,
+}
+
+impl Queue {
+    fn new() -> Self {
+        Queue {
+            length: 10,
+            first_half: vec![1, 2, 3, 4, 5],
+            second_half: vec![6, 7, 8, 9, 10],
+        }
+    }
+}
+
+fn send_tx(q: Queue, tx: mpsc::Sender<u32>) -> () {
+    let qc = Arc::new(q);
+    let qc1 = Arc::clone(&qc);
+    let qc2 = Arc::clone(&qc);
+
+    thread::spawn(move || {
+        for val in &qc1.first_half {
+            println!("sending {:?}", val);
+            tx.send(*val).unwrap();
+            thread::sleep(Duration::from_secs(1));
+        }
+    });
+
+    thread::spawn(move || {
+        for val in &qc2.second_half {
+            println!("sending {:?}", val);
+            tx.send(*val).unwrap();
+            thread::sleep(Duration::from_secs(1));
+        }
+    });
+}
+
+#[test]
+fn main() {
+    let (tx, rx) = mpsc::channel();
+    let queue = Queue::new();
+    let queue_length = queue.length;
+
+    send_tx(queue, tx);
+
+    let mut total_received: u32 = 0;
+    for received in rx {
+        println!("Got: {}", received);
+        total_received += 1;
+    }
+
+    println!("total numbers received: {}", total_received);
+    assert_eq!(total_received, queue_length)
+}