psblas3/prec/psb_zprecbld.f90

!!$ 
!!$              Parallel Sparse BLAS  version 2.2
!!$    (C) Copyright 2006/2007/2008
!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
!!$ 
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!!$    3. The name of the PSBLAS group or the names of its contributors may
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!!$  
subroutine psb_zprecbld(a,desc_a,p,info,upd)

  use psb_base_mod
  use psb_prec_mod, psb_protect_name => psb_zprecbld
  Implicit None

  type(psb_zspmat_type), intent(in), 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, n_row, n_col,ictxt,&
       & me,np,mglob, err_act
  integer      :: int_err(5)
  character    :: upd_

  integer,parameter  :: iroot=psb_root_,iout=60,ilout=40
  character(len=20)   :: name, ch_err

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

  info = 0
  int_err(1) = 0
  ictxt = psb_cd_get_context(desc_a)

  call psb_info(ictxt, me, np)

  if (present(upd)) then 
    upd_ = psb_toupper(upd)
  else
    upd_='F'
  endif
  if ((upd_ == 'F').or.(upd_ == 'T')) then
    ! ok
  else
    upd_='F'
  endif
  n_row   = psb_cd_get_local_rows(desc_a)
  n_col   = psb_cd_get_local_cols(desc_a)
  mglob   = psb_cd_get_global_rows(desc_a)
  !
  ! Should add check to ensure all procs have the same... 
  !
  ! ALso should define symbolic names for the preconditioners. 
  !

  call psb_check_def(p%iprcparm(psb_p_type_),'base_prec',&
       &  psb_diag_,is_legal_prec)

  call psb_nullify_desc(p%desc_data)

  select case(p%iprcparm(psb_p_type_)) 
  case (psb_noprec_)
    ! Do nothing. 
    call psb_cdcpy(desc_a,p%desc_data,info)
    if(info /= 0) then
      info=4010
      ch_err='psb_cdcpy'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

  case (psb_diag_)

    call psb_diagsc_bld(a,desc_a,p,upd_,info)
    if(info /= 0) then
      info=4010
      ch_err='psb_diagsc_bld'
      call psb_errpush(info,name,a_err=ch_err)
      goto 9999
    end if

  case (psb_bjac_)

    call psb_check_def(p%iprcparm(psb_f_type_),'fact',&
         &  psb_f_ilu_n_,is_legal_ml_fact)

    call psb_bjac_bld(a,desc_a,p,upd_,info)

    if(info /= 0) then
      call psb_errpush(4010,name,a_err='psb_bjac_bld')
      goto 9999
    end if

  case default
    info=4010
    ch_err='Unknown psb_p_type_'
    call psb_errpush(info,name,a_err=ch_err)
    goto 9999

  end select

  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)
  if (err_act == psb_act_abort_) then
    call psb_error()
    return
  end if
  return


end subroutine psb_zprecbld