psblas3/base/tools/psb_dspalloc.f90

!!$ 
!!$              Parallel Sparse BLAS  version 3.0
!!$    (C) Copyright 2006, 2007, 2008, 2009, 2010
!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        CNRS-IRIT, Toulouse
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! File: psb_dspalloc.f90
!
! Subroutine: psb_dspalloc
!    Allocate sparse matrix structure for psblas routines.
! 
! Arguments: 
!    a        - type(psb_dspmat_type).       The sparse matrix to be allocated.      
!    desc_a   - type(psb_desc_type).         The communication descriptor to be updated.
!    info     - integer.                       Return code.
!    nnz      - integer(optional).             The number of nonzeroes in the matrix.
!                                              (local, user estimate)
!
subroutine psb_dspalloc(a, desc_a, info, nnz)
  use psb_base_mod, psb_protect_name => psb_dspalloc
  implicit none

  !....parameters...
  type(psb_desc_type), intent(in) :: desc_a
  type(psb_dspmat_type), intent(inout) :: a
  integer, intent(out)               :: info
  integer, optional, intent(in)      :: nnz

  !locals
  integer             :: ictxt, dectype
  integer             :: np,me,loc_row,loc_col,&
       &  length_ia1,length_ia2, err_act,m,n
  integer             :: int_err(5)
  integer             :: debug_level, debug_unit
  character(len=20)   :: name, ch_err

  info=psb_success_
  if (psb_errstatus_fatal()) return 
  call psb_erractionsave(err_act)
  name = 'psb_dspall'
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()

  if (.not.desc_a%is_ok()) then
    info = psb_err_invalid_cd_state_
    call psb_errpush(info,name)
    goto 9999
  end if

  ictxt   = desc_a%get_context()
  dectype = desc_a%get_dectype()

  call psb_info(ictxt, me, np)
  !     ....verify blacs grid correctness..
  if (np == -1) then
    info = psb_err_context_error_
    call psb_errpush(info,name)
    goto 9999
  endif


  loc_row = desc_a%get_local_rows()
  loc_col = desc_a%get_local_cols()
  m       = desc_a%get_global_rows()
  n       = desc_a%get_global_cols()

  !...allocate matrix data...
  if (present(nnz))then 
    if (nnz < 0) then
      info=45
      int_err(1)=7
      int_err(2)=nnz
      call psb_errpush(info,name,int_err)
      goto 9999
    endif
    length_ia1=nnz
    length_ia2=nnz
  else 
    length_ia1=max(1,5*loc_row)
  endif

  if (debug_level >= psb_debug_ext_) &
       & write(debug_unit,*) me,' ',trim(name),':allocating size:',length_ia1
  call a%free()

  !....allocate aspk, ia1, ia2.....
  call a%csall(loc_row,loc_col,info,nz=length_ia1)
  if (psb_errstatus_fatal()) then
    info=psb_err_from_subroutine_
    call psb_errpush(info,name,int_err)
    goto 9999
  end if

  if (debug_level >= psb_debug_ext_) &
       & write(debug_unit,*) me,' ',trim(name),': ',  &
       & desc_a%get_dectype(),psb_desc_bld_

  return

  call psb_erractionrestore(err_act)
  return

9999 continue
  call psb_erractionrestore(err_act)

  if (err_act == psb_act_ret_) then
    return
  else
    call psb_error(ictxt)
  end if
  return

end subroutine psb_dspalloc