adding flush to mapped_region

include/fc/interprocess/file_mapping.hpp

@@ -28,6 +28,7 @@ namespace fc {
       mapped_region( const file_mapping& fm, mode_t m, size_t start, size_t size );
       mapped_region( const file_mapping& fm, mode_t m );
       ~mapped_region();
+      void  flush();
       void* get_address()const;
       size_t get_size()const;
     private:

src/file_mapping.cpp

@@ -16,5 +16,6 @@ namespace fc {
   :my( *fm.my, m == read_only ? boost::interprocess::read_only : boost::interprocess::read_write) { }
   mapped_region::~mapped_region(){}
   void* mapped_region::get_address()const { return my->get_address(); }
+  void mapped_region::flush(){ my->flush(); }
   size_t mapped_region::get_size()const { return my->get_size();    }
 }