* annotate.c (annotate_thread_changed): New function.

* thread.c (thread_command) : Use it.
* infrun.c (normal_stop): Use it.

gdb/annotate.c

@@ -242,6 +242,15 @@ annotate_new_thread (void)
     }
 }
 
+void
+annotate_thread_changed (void)
+{
+  if (annotation_level > 1)
+    {
+      printf_unfiltered (("\n\032\032thread-changed\n"));
+    }
+}
+
 void
 annotate_field_begin (struct type *type)
 {

gdb/infrun.c

@@ -3605,6 +3605,7 @@ normal_stop (void)
       target_terminal_ours_for_output ();
       printf_filtered (_("[Switching to %s]\n"),
 		       target_pid_to_str (inferior_ptid));
+      annotate_thread_changed ();
       previous_inferior_ptid = inferior_ptid;
     }
 

gdb/thread.c

@@ -738,6 +738,7 @@ thread_command (char *tidstr, int from_tty)
       return;
     }
 
+  annotate_thread_changed ();
   gdb_thread_select (uiout, tidstr, NULL);
 }