Description

   This routine changes the object name in the thread object for the
   thread specified by the thread argument to the value specified
   by the name argument. To set an existing thread's object name,
   call this routine after creating the thread. However, with this
   approach your program must account for the possibility that the
   target thread either has already exited or has been canceled
   before this routine is called.

   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.

   This routine contrasts with pthread_attr_setname_np(), which
   changes the object name attribute in a thread attributes object
   that is used to create a new thread.