psblas3/baseprec/psb_zprecbld.f90

!!$ 
!!$              Parallel Sparse BLAS  v2.0
!!$    (C) Copyright 2006 Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
!!$ 
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!!$ 
!!$  
subroutine psb_zprecbld(a,desc_a,p,info,upd)

  use psb_base_mod
  use psb_prec_type
  use psb_prec_mod, only : psb_baseprc_bld
  Implicit None

  type(psb_zspmat_type), target              :: a
  type(psb_desc_type), intent(in), target    :: desc_a
  type(psb_zprec_type),intent(inout)         :: p
  integer, intent(out)                       :: info
  character, intent(in), optional            :: upd


  ! Local scalars
  Integer      :: err,i,j,k,ictxt, me,np,lw, err_act
  integer      :: int_err(5)
  character    :: iupd

  logical, parameter :: debug=.false.   
  integer,parameter  :: iroot=0,iout=60,ilout=40
  character(len=20)   :: name, ch_err

  if(psb_get_errstatus().ne.0) return 
  info=0
  err=0
  call psb_erractionsave(err_act)
  name = 'psb_precbld'

  if (debug) write(0,*) 'Entering precbld',P%prec,desc_a%matrix_data(:)
  info = 0
  int_err(1) = 0
  ictxt = psb_cd_get_context(desc_a)

  if (debug) write(0,*) 'Preconditioner psb_info'
  call psb_info(ictxt, me, np)

  if (present(upd)) then 
    if (debug) write(0,*) 'UPD ', upd
    if ((upd.eq.'F').or.(upd.eq.'T')) then
      iupd=upd
    else
      iupd='F'
    endif
  else
    iupd='F'
  endif

  if (.not.allocated(p%baseprecv)) then 
    !! Error 1: should call precset
      info=4010
      ch_err='unallocated bpv'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
  end if
  !
  ! Should add check to ensure all procs have the same... 
  !
  ! ALso should define symbolic names for the preconditioners. 
  !
  call init_baseprc_av(p%baseprecv(1),info)
  if (info /= 0) then 
    info=4010
    ch_err='allocate'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  endif
  
  call psb_baseprc_bld(a,desc_a,p%baseprecv(1),info,iupd)
  if (info /= 0) then 
    info=4010
    ch_err='baseprc_bld'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999
  endif
  

  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)
  if (err_act.eq.act_abort) then
    call psb_error()
    return
  end if
  return

contains

  subroutine init_baseprc_av(p,info)
    type(psb_zbaseprc_type), intent(inout) :: p
    integer                                :: info
    if (allocated(p%av)) then 
      ! Have not decided what to do yet
    end if
    allocate(p%av(max_avsz),stat=info)
!!$    if (info /= 0) return
    do k=1,size(p%av)
      call psb_nullify_sp(p%av(k))
    end do
  end subroutine init_baseprc_av

end subroutine psb_zprecbld