diff --git a/linker/linker_soinfo.h b/linker/linker_soinfo.h
index 273c36c..91118b0 100644
--- a/linker/linker_soinfo.h
+++ b/linker/linker_soinfo.h
@@ -52,6 +52,14 @@
                                          // when load group is crossing
                                          // namespace boundary twice and second
                                          // local group depends on the same libraries.
+#define FLAG_TLS_NODELETE     0x00000200 // This flag set when there is at least one
+                                         // outstanding thread_local dtor
+                                         // registered with this soinfo. In such
+                                         // a case the actual unload is
+                                         // postponed until the last thread_local
+                                         // destructor associated with this
+                                         // soinfo is executed and this flag is
+                                         // unset.
 #define FLAG_NEW_SOINFO       0x40000000 // new soinfo format
 
 #define SOINFO_VERSION 3
@@ -253,9 +261,12 @@
   void set_linker_flag();
   void set_main_executable();
   void set_nodelete();
+  void set_tls_nodelete();
+  void unset_tls_nodelete();
 
   size_t increment_ref_count();
   size_t decrement_ref_count();
+  size_t get_ref_count() const;
 
   soinfo* get_local_group_root() const;