Red hat Linux support

I want to know whether RedHat Linux
Enterprise editions support, functions
in following section in its libraries,
Threads
_______
thr_min_stack()
thr_main()
thr_suspend()
doors
_______
door_bind()
door_call()
door_create()
door_cred()
door_info()
door_return()
door_revoke()
door_server_create()
door_unbind()
  if not does its libray has any
other functions that give the same
functionality?
   if so can i get the list of such
functions