limits: Adding support for callback that fired every time a new slot becomes available
diff --git a/utils/ndn-limits-window.cc b/utils/ndn-limits-window.cc
index 95c221b..a859be5 100644
--- a/utils/ndn-limits-window.cc
+++ b/utils/ndn-limits-window.cc
@@ -80,6 +80,8 @@
 
   NS_ASSERT_MSG (m_outstanding >= (uint32_t)1, "Should not be possible, unless we decreasing this number twice somewhere");
   m_outstanding -= 1;
+
+  FireAvailableSlotCallback ();
 }
 
 } // namespace ndn