Added trait SynchObj to relevant structs

src/utility/objaddr.rs

@@ -15,7 +15,7 @@ pub trait SynchObj { }
 /// A method allows to detect of an object corresponding to a given
 /// identifier exists; this is used to check the parameters of system
 /// calls.
-struct ObjAddr<'a> {
+pub struct ObjAddr<'a> {
     last_id: i32,
     map: HashMap<i32, &'a dyn SynchObj>
 }