diff --git a/r9/src/listhead.rs b/r9/src/listhead.rs
index 9a21544..d877a96 100644
--- a/r9/src/listhead.rs
+++ b/r9/src/listhead.rs
@@ -13,6 +13,9 @@ pub struct ListHead<T> {
     _self_wp: Weak::<RefCell::<Self>>,
 }
 
+unsafe impl<T> Send for ListHead<T> {}
+unsafe impl<T> Sync for ListHead<T> {}
+
 impl<T> ListHead<T> {
 
     fn new(data: Weak::<RefCell::<T>>) -> Rc::<RefCell::<Self>> {
diff --git a/r9/src/queue.rs b/r9/src/queue.rs
index 468103d..268e2e3 100644
--- a/r9/src/queue.rs
+++ b/r9/src/queue.rs
@@ -1,6 +1,7 @@
 use std::rc::{Rc, Weak};
 use std::cell::RefCell;
 use std::sync::Mutex;
+//use futures::lock::Mutex;
 use std::sync::Arc;
 use std::thread;
 use std::thread::Thread;