diff --git a/src/runtime2/communication.rs b/src/runtime2/communication.rs
index 2d0aee324b8730312c3a22e5c81f677fd31e7e5c..c615f06d5d5d08a99f8dbae16ff36c34639be553 100644
--- a/src/runtime2/communication.rs
+++ b/src/runtime2/communication.rs
@@ -26,10 +26,20 @@ pub enum PortKind {
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub enum PortState {
     Open,
-    Blocked,
+    BlockedDueToPeerChange,
+    BlockedDueToFullBuffers,
     Closed,
 }
 
+impl PortState {
+    pub fn is_blocked(&self) -> bool {
+        match self {
+            PortState::BlockedDueToPeerChange | PortState::BlockedDueToFullBuffers => true,
+            PortState::Open | PortState::Closed => false,
+        }
+    }
+}
+
 pub struct Channel {
     pub putter_id: PortId,
     pub getter_id: PortId,