Changed all reference to thread with an RefCell to enforce mutability

src/kernel/scheduler.rs

@@ -1,3 +1,4 @@
+use std::cell::RefCell;
 use std::rc::Rc;
 
 use crate::utility::list::List;
@@ -7,7 +8,7 @@ use super::system::System;
 
 #[derive(PartialEq)]
 pub struct Scheduler {
-    ready_list: List<Rc<Thread>>
+    ready_list: List<Rc<RefCell<Thread>>>
 }
 
 impl Scheduler {
@@ -28,7 +29,7 @@ impl Scheduler {
     /// ## Pamameter
     /// 
     /// **thread** is the thread to be put on the read list
-    pub fn ready_to_run(&mut self, thread: Rc<Thread>) {
+    pub fn ready_to_run(&mut self, thread: Rc<RefCell<Thread>>) {
         self.ready_list.push(thread);
     }
     
@@ -38,7 +39,7 @@ impl Scheduler {
     /// Thread is removed from the ready list.
     /// 
     /// **return** Thread thread to be scheduled
-    pub fn find_next_to_run(&mut self) -> Option<Rc<Thread>> {
+    pub fn find_next_to_run(&mut self) -> Option<Rc<RefCell<Thread>>> {
         self.ready_list.pop()
     }