Description

   This routine uses the values specified in the stackaddr and size
   arguments to set the base stack address and size of the thread
   attributes object specified in the attr argument.

   When creating a thread, use a thread attributes object to specify
   nondefault values for thread attributes. The default value for
   the stack address attribute of an initialized thread attributes
   object is NULL.

   Unlike pthread_attr_setstackaddr(), this routine is a much more
   reliable portable interface. With the POSIX standard pthread_
   attr_setstackaddr(), a stack is specified using a single,
   undefined, address. An implementation of the standard can only
   assume that the specified value represents the value to which the
   thread's stack pointer should be set when beginning execution.
   However, this requires the application to know how the machine
   uses the stack. For example, a stack may "grow" either up (to
   higher addresses) or down (to lower addresses), and may be
   decreased (or increased) either before or after storing a new
   value.

   The Threads Library provides an alternative interface with
   pthread_attr_setstackaddr_np(). Instead of specifying a stack
   address, you specify the base (lowest) address and the size.