created Worker struct and updated ThreadPoll to store vec of Worker i…

…nstead of thread

src/lib.rs

@@ -1,7 +1,7 @@
 use std::thread;
 
 pub struct ThreadPool {
-    threads: Vec<thread::JoinHandle<()>>,
+    workers: Vec<Worker>,
 }
 
 impl ThreadPool {
@@ -15,11 +15,13 @@ impl ThreadPool {
     pub fn new(size: usize) -> ThreadPool {
         assert!(size > 0);
 
-        let mut threads = Vec::with_capacity(size);
+        let mut workers = Vec::with_capacity(size);
 
-        for _ in 0..size {}
+        for id in 0..size {
+            workers.push(Worker::new(id))
+        }
 
-        ThreadPool { threads }
+        ThreadPool { workers }
     }
 
     pub fn execute<F>(&self, f: F)
@@ -28,3 +30,15 @@ impl ThreadPool {
     {
     }
 }
+
+struct Worker {
+    id: usize,
+    thread: thread::JoinHandle<()>,
+}
+
+impl Worker {
+    pub fn new(id: usize) -> Worker {
+        let thread = thread::spawn(|| {});
+        Worker { id, thread }
+    }
+}