--- detail/file_wrapper.hpp	Thu Jan 13 01:26:04 2011
+++ detail/file_wrapper.hpp	Thu Jan 13 01:26:04 2011
@@ -179,7 +179,7 @@
 
 inline void file_wrapper::truncate(offset_t length)
 {
-   if(!truncate_file(m_handle, length)){
+   if(!truncate_file(m_handle, length, true)){
       error_info err(system_error_code());
       throw interprocess_exception(err);
    }
--- detail/os_file_functions.hpp	Thu Jan 13 01:26:04 2011
+++ detail/os_file_functions.hpp	Thu Jan 13 01:26:04 2011
@@ -121,19 +121,21 @@
 inline bool delete_file(const char *name)
 {  return winapi::unlink_file(name);   }
 
-inline bool truncate_file (file_handle_t hnd, std::size_t size)
+inline bool truncate_file (file_handle_t hnd, offset_t size, bool fill_with_zeros )
 {
+   if(fill_with_zeros){
    offset_t filesize;
    if(!winapi::get_file_size(hnd, filesize))
       return false;
 
-   if(size > (unsigned long long)filesize){
-      if(!winapi::set_file_pointer_ex(hnd, filesize, 0, winapi::file_begin)){
+      if(size > filesize){
+         if(! (winapi::set_file_pointer_ex(hnd, filesize, 0, winapi::file_begin) && 
+               winapi::set_end_of_file(hnd) ) ){
          return false;
       }      
       //We will write zeros in the end of the file
       //since set_end_of_file does not guarantee this
-      for(std::size_t remaining = size - filesize, write_size = 0
+         for(offset_t remaining = size - filesize, write_size = 0
          ;remaining > 0
          ;remaining -= write_size){
          const std::size_t DataSize = 512;
@@ -145,16 +147,13 @@
             return false;
          }
       }
-   }
-   else{
-      if(!winapi::set_file_pointer_ex(hnd, size, 0, winapi::file_begin)){
-         return false;
-      }
-      if(!winapi::set_end_of_file(hnd)){
-         return false;
-      }
-   }
    return true;
+      } //if(static_cast<offset_t>(size) > filesize){
+   } // if(fill_with_zeros){
+
+   return 
+      winapi::set_file_pointer_ex(hnd, size, 0, winapi::file_begin) &&
+      winapi::set_end_of_file(hnd);
 }
 
 inline bool get_file_size(file_handle_t hnd, offset_t &size)
@@ -437,7 +436,7 @@
 inline bool delete_file(const char *name)
 {  return ::unlink(name) == 0;   }
 
-inline bool truncate_file (file_handle_t hnd, std::size_t size)
+inline bool truncate_file (file_handle_t hnd, std::size_t size, bool /*fill_with_zeros*/)
 {  return 0 == ::ftruncate(hnd, size);   }
 
 inline bool get_file_size(file_handle_t hnd, offset_t &size)
--- file_mapping.hpp	Thu Oct 15 21:46:26 2009
+++ file_mapping.hpp	Thu Oct 15 21:46:26 2009
@@ -90,6 +90,10 @@
    //!being used other processes and no deletion permission was shared.
    static bool remove(const char *filename);
 
+   //!Resizes file to the specified size
+   //!The function might fail if file cannot be resized.
+   void resize( offset_t new_size, bool fill_tail_with_zeros );
+
    /// @cond
    private:
    //!Closes a previously opened file mapping. Never throws.
@@ -159,6 +163,13 @@
 }
 
 ///@endcond
+
+inline void file_mapping::resize( offset_t new_size, bool fill_tail_with_zeros ) {
+   if( !detail::truncate_file( m_handle, new_size, fill_tail_with_zeros ) ) {
+      error_info err = system_error_code();
+      throw interprocess_exception(err);
+   }
+}
 
 //!A class that stores the name of a file
 //!and tries to remove it in its destructor
--- shared_memory_object.hpp	Thu Jan 13 01:26:04 2011
+++ shared_memory_object.hpp	Thu Jan 13 01:26:04 2011
@@ -229,7 +229,7 @@
 
 inline void shared_memory_object::truncate(offset_t length)
 {
-   if(!detail::truncate_file(m_handle, length)){
+   if(!detail::truncate_file(m_handle, length, true)){
       error_info err = system_error_code();
       throw interprocess_exception(err);
    }