amg4psblas/mlprec/mld_s_diag_solver.f90

!!$
!!$ 
!!$                           MLD2P4  version 2.0
!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$             based on PSBLAS (Parallel Sparse BLAS version 3.0)
!!$  
!!$  (C) Copyright 2008,2009,2010,2012,2013
!!$
!!$                      Salvatore Filippone  University of Rome Tor Vergata
!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
!!$                      Daniela di Serafino  Second University of Naples
!!$ 
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module mld_s_diag_solver

  use mld_s_base_solver_mod

  type, extends(mld_s_base_solver_type) :: mld_s_diag_solver_type
    type(psb_s_vect_type), allocatable :: dv
    real(psb_spk_), allocatable        :: d(:)
  contains
    procedure, pass(sv) :: build   => mld_s_diag_solver_bld
    procedure, pass(sv) :: clone   => mld_s_diag_solver_clone
    procedure, pass(sv) :: apply_v => mld_s_diag_solver_apply_vect
    procedure, pass(sv) :: apply_a => mld_s_diag_solver_apply
    procedure, pass(sv) :: free    => s_diag_solver_free
    procedure, pass(sv) :: descr   => s_diag_solver_descr
    procedure, pass(sv) :: sizeof  => s_diag_solver_sizeof
    procedure, pass(sv) :: get_nzeros  => s_diag_solver_get_nzeros
    procedure, nopass   :: get_fmt   => s_diag_solver_get_fmt
  end type mld_s_diag_solver_type


  private :: s_diag_solver_free,  s_diag_solver_descr, &
       & s_diag_solver_sizeof, s_diag_solver_get_nzeros, &
       & s_diag_solver_get_fmt


  interface 
    subroutine mld_s_diag_solver_apply_vect(alpha,sv,x,beta,y,desc_data,trans,work,info)
      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
       & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, &
       & mld_s_diag_solver_type, psb_ipk_
      type(psb_desc_type), intent(in)                :: desc_data
      class(mld_s_diag_solver_type), intent(inout) :: sv
      type(psb_s_vect_type), intent(inout)         :: x
      type(psb_s_vect_type), intent(inout)         :: y
      real(psb_spk_),intent(in)                     :: alpha,beta
      character(len=1),intent(in)                    :: trans
      real(psb_spk_),target, intent(inout)          :: work(:)
      integer(psb_ipk_), intent(out)                 :: info
    end subroutine mld_s_diag_solver_apply_vect
  end interface
  
  interface 
    subroutine mld_s_diag_solver_apply(alpha,sv,x,beta,y,desc_data,trans,work,info)
      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
       & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, &
       & mld_s_diag_solver_type, psb_ipk_
      type(psb_desc_type), intent(in)            :: desc_data
      class(mld_s_diag_solver_type), intent(in) :: sv
      real(psb_spk_), intent(inout)             :: x(:)
      real(psb_spk_), intent(inout)             :: y(:)
      real(psb_spk_),intent(in)                 :: alpha,beta
      character(len=1),intent(in)                :: trans
      real(psb_spk_),target, intent(inout)      :: work(:)
      integer(psb_ipk_), intent(out)             :: info
    end subroutine mld_s_diag_solver_apply
  end interface
  
  interface 
    subroutine mld_s_diag_solver_bld(a,desc_a,sv,upd,info,b,amold,vmold)
      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
           & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, &
           & mld_s_diag_solver_type, psb_ipk_      
      type(psb_sspmat_type), intent(in), target           :: a
      Type(psb_desc_type), Intent(in)                       :: desc_a 
      class(mld_s_diag_solver_type), intent(inout)        :: sv
      character, intent(in)                                 :: upd
      integer(psb_ipk_), intent(out)                        :: info
      type(psb_sspmat_type), intent(in), target, optional :: b
      class(psb_s_base_sparse_mat), intent(in), optional  :: amold
      class(psb_s_base_vect_type), intent(in), optional   :: vmold
    end subroutine mld_s_diag_solver_bld
  end interface
   
  interface
    subroutine mld_s_diag_solver_clone(sv,svout,info)
      import :: psb_desc_type, psb_sspmat_type,  psb_s_base_sparse_mat, &
           & psb_s_vect_type, psb_s_base_vect_type, psb_spk_, &
           & mld_s_base_solver_type, mld_s_diag_solver_type, psb_ipk_
      Implicit None
      
      ! Arguments
      class(mld_s_diag_solver_type), intent(inout)              :: sv
      class(mld_s_base_solver_type), allocatable, intent(inout) :: svout
      integer(psb_ipk_), intent(out)               :: info
    end subroutine mld_s_diag_solver_clone
  end interface
  
  
contains

  subroutine s_diag_solver_free(sv,info)

    Implicit None

    ! Arguments
    class(mld_s_diag_solver_type), intent(inout) :: sv
    integer(psb_ipk_), intent(out)                 :: info
    integer(psb_ipk_) :: err_act
    character(len=20) :: name='s_diag_solver_free'

    call psb_erractionsave(err_act)
    info = psb_success_

    call sv%dv%free(info)
        
    if (allocated(sv%d)) then 
      deallocate(sv%d,stat=info)
      if (info /= psb_success_) then 
        info = psb_err_alloc_dealloc_
        call psb_errpush(info,name)
        goto 9999 
      end if
    end if

    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 s_diag_solver_free

  subroutine s_diag_solver_descr(sv,info,iout,coarse)

    Implicit None

    ! Arguments
    class(mld_s_diag_solver_type), intent(in) :: sv
    integer(psb_ipk_), intent(out)              :: info
    integer(psb_ipk_), intent(in), optional     :: iout
    logical, intent(in), optional               :: coarse

    ! Local variables
    integer(psb_ipk_)      :: err_act
    character(len=20), parameter :: name='mld_s_diag_solver_descr'
    integer(psb_ipk_) :: iout_

    info = psb_success_
    if (present(iout)) then 
      iout_ = iout 
    else
      iout_ = 6
    endif
    
    write(iout_,*) '  Diagonal local solver '

    return

  end subroutine s_diag_solver_descr

  function s_diag_solver_sizeof(sv) result(val)
    implicit none 
    ! Arguments
    class(mld_s_diag_solver_type), intent(in) :: sv
    integer(psb_long_int_k_) :: val
    integer(psb_ipk_)             :: i

    val = 0
    if (allocated(sv%dv)) val = val + sv%dv%sizeof()

    return
  end function s_diag_solver_sizeof

  function s_diag_solver_get_nzeros(sv) result(val)
    implicit none 
    ! Arguments
    class(mld_s_diag_solver_type), intent(in) :: sv
    integer(psb_long_int_k_) :: val
    integer(psb_ipk_)             :: i

    val = 0
    if (allocated(sv%dv)) val = val +  sv%dv%get_nrows()

    return
  end function s_diag_solver_get_nzeros

  function s_diag_solver_get_fmt() result(val)
    implicit none 
    character(len=32)  :: val

    val = "Diag solver"
  end function s_diag_solver_get_fmt


end module mld_s_diag_solver