diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMEventListener.java b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMEventListener.java
index b118a372451..88c5d7c2126 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMEventListener.java
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMEventListener.java
@@ -14,6 +14,7 @@ import java.util.concurrent.Executor;
 
 import org.eclipse.cdt.dsf.concurrent.ConfinedToDsfExecutor;
 import org.eclipse.cdt.dsf.concurrent.RequestMonitor;
+import org.eclipse.cdt.dsf.concurrent.ThreadSafe;
 
 /**
  * A listener participating in event notifications sent out from VM adapter.
@@ -26,6 +27,7 @@ public interface IVMEventListener {
     /**
      * Returns the executor that needs to be used to access this event listener. 
      */
+    @ThreadSafe
     public Executor getExecutor();
     
 	/**
diff --git a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMProvider.java b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMProvider.java
index 8d0581665c6..56f861e9c8a 100644
--- a/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMProvider.java
+++ b/dsf/org.eclipse.cdt.dsf.ui/src/org/eclipse/cdt/dsf/ui/viewmodel/IVMProvider.java
@@ -13,6 +13,7 @@ package org.eclipse.cdt.dsf.ui.viewmodel;
 import java.util.concurrent.Executor;
 
 import org.eclipse.cdt.dsf.concurrent.ConfinedToDsfExecutor;
+import org.eclipse.cdt.dsf.concurrent.ThreadSafe;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenCountUpdate;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IChildrenUpdate;
 import org.eclipse.debug.internal.ui.viewers.model.provisional.IColumnPresentationFactory;
@@ -67,6 +68,7 @@ public interface IVMProvider
     /**
      * Returns the executor that needs to be used to access this provider. 
      */
+    @ThreadSafe
     public Executor getExecutor();
     
     /**