psblas3/base/tools/psb_sspalloc.f90

!   
!                Parallel Sparse BLAS  version 3.5
!      (C) Copyright 2006-2018
!        Salvatore Filippone    
!        Alfredo Buttari      
!   
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!    modification, are permitted provided that the following conditions
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!   
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!   
!    
! File: psb_sspalloc.f90
!
! Subroutine: psb_sspalloc
!    Allocate sparse matrix structure for psblas routines.
! 
! Arguments: 
!    a        - type(psb_sspmat_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_sspalloc(a, desc_a, info, nnz)
  use psb_base_mod, psb_protect_name => psb_sspalloc
  implicit none

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

  !locals
  type(psb_ctxt_type) :: ctxt
  integer(psb_ipk_) :: np, me, err_act
  integer(psb_ipk_) :: loc_row,loc_col, nnz_, dectype
  integer(psb_lpk_) :: m, n
  integer(psb_ipk_) :: debug_level, debug_unit
  character(len=20)   :: name

  info=psb_success_
  call psb_erractionsave(err_act)
  if (psb_errstatus_fatal()) then
    info = psb_err_internal_error_ ;    goto 9999
  end if
  name = 'psb_sspall'
  debug_unit  = psb_get_debug_unit()
  debug_level = psb_get_debug_level()

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

  call psb_info(ctxt, 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
      call psb_errpush(info,name,i_err=(/7_psb_ipk_,nnz/))
      goto 9999
    endif
    nnz_ = nnz
  else 
    nnz_ = max(1,5*loc_row)
  endif

  if (debug_level >= psb_debug_ext_) &
       & write(debug_unit,*) me,' ',trim(name), &
       & ':allocating size:',loc_row,loc_col,nnz_
  call a%free()
  !....allocate aspk, ia1, ia2.....
  call a%csall(loc_row,loc_col,info,nz=nnz_)
  if(info /= psb_success_) then
    info=psb_err_from_subroutine_
    call psb_errpush(info,name,a_err='sp_all')
    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 call psb_error_handler(ctxt,err_act)

  return

end subroutine psb_sspalloc