psblas3/base/tools/psb_dspalloc.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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! File: psb_dspalloc.f90
!
! Subroutine: psb_dspalloc
!    Allocate sparse matrix structure for psblas routines.
! 
! Arguments: 
!    a        - type(psb_d_sparse_mat).       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_descriptor_type
  use psb_serial_mod
  use psb_const_mod
  use psb_error_mod
  use psb_penv_mod
  implicit none

  !....parameters...
  type(psb_desc_type), intent(inout) :: desc_a
  type(psb_d_sparse_mat), intent(out) :: 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

  if(psb_get_errstatus() /= 0) return 
  info=0
  call psb_erractionsave(err_act)
  name = 'psb_dspall'
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()

  ictxt   = psb_cd_get_context(desc_a)
  dectype = psb_cd_get_dectype(desc_a)

  call psb_info(ictxt, me, np)
  !     ....verify blacs grid correctness..
  if (np == -1) then
    info = 2010
    call psb_errpush(info,name)
    goto 9999
  endif


  loc_row = psb_cd_get_local_rows(desc_a)
  loc_col = psb_cd_get_local_cols(desc_a)
  m       = psb_cd_get_global_rows(desc_a)
  n       = psb_cd_get_global_cols(desc_a)

  !...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

  !....allocate aspk, ia1, ia2.....
  call a%csall(loc_row,loc_col,info,nz=length_ia1)
  if(info /= 0) then
    info=4010
    ch_err='sp_all'
    call psb_errpush(info,name,int_err)
    goto 9999
  end if

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