amg4psblas/mlprec/mld_d_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
!!$
!!$                      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_d_diag_solver

  use mld_d_base_solver_mod

  type, extends(mld_d_base_solver_type) :: mld_d_diag_solver_type
    type(psb_d_vect_type), allocatable :: dv
    real(psb_dpk_), allocatable        :: d(:)
  contains
    procedure, pass(sv) :: build   => mld_d_diag_solver_bld
    procedure, pass(sv) :: apply_v => mld_d_diag_solver_apply_vect
    procedure, pass(sv) :: apply_a => mld_d_diag_solver_apply
    procedure, pass(sv) :: free    => d_diag_solver_free
    procedure, pass(sv) :: seti    => d_diag_solver_seti
    procedure, pass(sv) :: setc    => d_diag_solver_setc
    procedure, pass(sv) :: setr    => d_diag_solver_setr
    procedure, pass(sv) :: descr   => d_diag_solver_descr
    procedure, pass(sv) :: sizeof  => d_diag_solver_sizeof
    procedure, pass(sv) :: get_nzeros  => d_diag_solver_get_nzeros
  end type mld_d_diag_solver_type


  private :: d_diag_solver_free,   d_diag_solver_seti, &
       &  d_diag_solver_setc,   d_diag_solver_setr,&
       &  d_diag_solver_descr,  d_diag_solver_sizeof,&
       &  d_diag_solver_get_nzeros


  interface 
    subroutine mld_d_diag_solver_apply_vect(alpha,sv,x,beta,y,desc_data,trans,work,info)
      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
       & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, mld_d_diag_solver_type
      type(psb_desc_type), intent(in)              :: desc_data
      class(mld_d_diag_solver_type), intent(inout) :: sv
      type(psb_d_vect_type), intent(inout)         :: x
      type(psb_d_vect_type), intent(inout)         :: y
      real(psb_dpk_),intent(in)                    :: alpha,beta
      character(len=1),intent(in)                  :: trans
      real(psb_dpk_),target, intent(inout)         :: work(:)
      integer, intent(out)                         :: info
    end subroutine mld_d_diag_solver_apply_vect
  end interface
  
  interface 
    subroutine mld_d_diag_solver_apply(alpha,sv,x,beta,y,desc_data,trans,work,info)
      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
       & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, mld_d_diag_solver_type
      type(psb_desc_type), intent(in)           :: desc_data
      class(mld_d_diag_solver_type), intent(in) :: sv
      real(psb_dpk_), intent(inout)             :: x(:)
      real(psb_dpk_), intent(inout)             :: y(:)
      real(psb_dpk_),intent(in)                 :: alpha,beta
      character(len=1),intent(in)               :: trans
      real(psb_dpk_),target, intent(inout)      :: work(:)
      integer, intent(out)                      :: info
    end subroutine mld_d_diag_solver_apply
  end interface
  
  interface 
    subroutine mld_d_diag_solver_bld(a,desc_a,sv,upd,info,b,amold,vmold)
      import :: psb_desc_type, psb_dspmat_type,  psb_d_base_sparse_mat, &
           & psb_d_vect_type, psb_d_base_vect_type, psb_dpk_, mld_d_diag_solver_type
      type(psb_dspmat_type), intent(in), target           :: a
      Type(psb_desc_type), Intent(in)                     :: desc_a 
      class(mld_d_diag_solver_type), intent(inout)        :: sv
      character, intent(in)                               :: upd
      integer, intent(out)                                :: info
      type(psb_dspmat_type), intent(in), target, optional :: b
      class(psb_d_base_sparse_mat), intent(in), optional  :: amold
      class(psb_d_base_vect_type), intent(in), optional   :: vmold
    end subroutine mld_d_diag_solver_bld
  end interface
  
  
contains


  subroutine d_diag_solver_seti(sv,what,val,info)

    Implicit None

    ! Arguments
    class(mld_d_diag_solver_type), intent(inout) :: sv 
    integer, intent(in)                    :: what 
    integer, intent(in)                    :: val
    integer, intent(out)                   :: info
    Integer :: err_act
    character(len=20)  :: name='d_diag_solver_seti'

    info = psb_success_


    return

  end subroutine d_diag_solver_seti

  subroutine d_diag_solver_setc(sv,what,val,info)

    Implicit None

    ! Arguments
    class(mld_d_diag_solver_type), intent(inout) :: sv
    integer, intent(in)                    :: what 
    character(len=*), intent(in)           :: val
    integer, intent(out)                   :: info
    Integer :: err_act, ival
    character(len=20)  :: name='d_diag_solver_setc'

    info = psb_success_

    return
  end subroutine d_diag_solver_setc
  
  subroutine d_diag_solver_setr(sv,what,val,info)

    Implicit None

    ! Arguments
    class(mld_d_diag_solver_type), intent(inout) :: sv 
    integer, intent(in)                    :: what 
    real(psb_dpk_), intent(in)             :: val
    integer, intent(out)                   :: info
    Integer :: err_act
    character(len=20)  :: name='d_diag_solver_setr'

    info = psb_success_

    return

  end subroutine d_diag_solver_setr

  subroutine d_diag_solver_free(sv,info)

    Implicit None

    ! Arguments
    class(mld_d_diag_solver_type), intent(inout) :: sv
    integer, intent(out)                       :: info
    Integer :: err_act
    character(len=20)  :: name='d_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 d_diag_solver_free

  subroutine d_diag_solver_descr(sv,info,iout,coarse)

    Implicit None

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

    ! Local variables
    integer      :: err_act
    integer      :: ictxt, me, np
    character(len=20), parameter :: name='mld_d_diag_solver_descr'
    integer :: iout_

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

    return

  end subroutine d_diag_solver_descr

  function d_diag_solver_sizeof(sv) result(val)
    implicit none 
    ! Arguments
    class(mld_d_diag_solver_type), intent(in) :: sv
    integer(psb_long_int_k_) :: val
    integer             :: i

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

    return
  end function d_diag_solver_sizeof

  function d_diag_solver_get_nzeros(sv) result(val)
    implicit none 
    ! Arguments
    class(mld_d_diag_solver_type), intent(in) :: sv
    integer(psb_long_int_k_) :: val
    integer             :: i

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

    return
  end function d_diag_solver_get_nzeros

end module mld_d_diag_solver