Adding some content to thread

src/utility/system.rs

@@ -1,13 +1,16 @@
-use std::sync::{Mutex, RwLock};
+use std::sync::{RwLock, Arc};
 
 use lazy_static::lazy_static;
 
 use crate::kernel::thread::Thread;
+
+use super::list::List;
 extern crate lazy_static;
 
 lazy_static! {
     pub static ref G_CURRENT_THREAD: RwLock<Option<Thread>> = RwLock::new(Option::None);
     pub static ref G_THREAD_TO_BE_DESTROYED: RwLock<Option<Thread>> = RwLock::new(Option::None);
+    // pub static ref G_ALIVE: Arc<RwLock<List<Thread>>> = Arc::new(RwLock::new(List::new()));
 }