Description

   This routine changes the object name in the read-write lock
   object specified by rwlock to the value specified by name. To
   set a new read-write lock object's object name, call this routine
   immediately after initializing the read-write lock object.

   The object name is a C language string and provides an identifier
   that is meaningful to a person debugging a multithreaded
   application. The maximum number of characters in the object name
   is 31.