use of system in parameters in synch

src/kernel/system.rs

@@ -12,7 +12,10 @@ macro_rules! init_system {
         init_system!(m)
     }};
     ($a:expr) => {{
-        System::new($a)
+        let sys = std::rc::Rc::new(std::cell::RefCell::new(crate::System::new($a)));
+        crate::System::freeze(std::rc::Rc::clone(&sys));
+        sys
+
     }};
 }
 
@@ -59,6 +62,10 @@ impl System {
         &self.g_machine
     }
 
+    pub fn get_thread_manager(&self) -> Rc<RefCell<ThreadManager>> {
+        Rc::clone(&self.thread_manager)
+    }
+
     // Setters
 
     /// Assign a machine to the system