!!$
!!$ 
!!$                           MLD2P4  version 2.1
!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
!!$             based on PSBLAS (Parallel Sparse BLAS version 3.4)
!!$  
!!$  (C) Copyright 2008, 2010, 2012, 2015, 2017 
!!$
!!$                      Salvatore Filippone    Cranfield University
!!$		         Ambra Abdullahi Hassan University of Rome Tor Vergata
!!$                      Alfredo Buttari        CNRS-IRIT, Toulouse
!!$                      Pasqua D'Ambra         ICAR-CNR, Naples
!!$                      Daniela di Serafino    Second University of Naples
!!$ 
!!$  Redistribution and use in source and binary forms, with or without
!!$  modification, are permitted provided that the following conditions
!!$  are met:
!!$    1. Redistributions of source code must retain the above copyright
!!$       notice, this list of conditions and the following disclaimer.
!!$    2. Redistributions in binary form must reproduce the above copyright
!!$       notice, this list of conditions, and the following disclaimer in the
!!$       documentation and/or other materials provided with the distribution.
!!$    3. The name of the MLD2P4 group or the names of its contributors may
!!$       not be used to endorse or promote products derived from this
!!$       software without specific written permission.
!!$ 
!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!!$  POSSIBILITY OF SUCH DAMAGE.
!!$ 
!!$
!
!
!
! Identity solver. Reference for nullprec. 
!
!

  subroutine mld_s_id_solver_apply_vect(alpha,sv,x,beta,y,desc_data,trans,work,info)
    use psb_base_mod
    use mld_s_id_solver, mld_protect_name => mld_s_id_solver_apply_vect
    implicit none 
    type(psb_desc_type), intent(in)            :: desc_data
    class(mld_s_id_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, intent(out)                       :: info

    integer    :: n_row,n_col
    integer    :: ictxt,np,me,i, err_act
    character          :: trans_
    character(len=20)  :: name='s_id_solver_apply_vect'

    call psb_erractionsave(err_act)

    info = psb_success_

    trans_ = psb_toupper(trans)
    select case(trans_)
    case('N')
    case('T')
    case('C')
    case default
      call psb_errpush(psb_err_iarg_invalid_i_,name)
      goto 9999
    end select

    call psb_geaxpby(alpha,x,beta,y,desc_data,info)    

    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 mld_s_id_solver_apply_vect


  subroutine mld_s_id_solver_apply(alpha,sv,x,beta,y,desc_data,trans,work,info)
    use psb_base_mod
    use mld_s_id_solver, mld_protect_name => mld_s_id_solver_apply
    implicit none 
    type(psb_desc_type), intent(in)      :: desc_data
    class(mld_s_id_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, intent(out)                 :: info

    integer    :: n_row,n_col
    integer    :: ictxt,np,me,i, err_act
    character          :: trans_
    character(len=20)  :: name='s_id_solver_apply'

    call psb_erractionsave(err_act)

    info = psb_success_

    trans_ = psb_toupper(trans)
    select case(trans_)
    case('N')
    case('T')
    case('C')
    case default
      call psb_errpush(psb_err_iarg_invalid_i_,name)
      goto 9999
    end select

    call psb_geaxpby(alpha,x,beta,y,desc_data,info)    

    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 mld_s_id_solver_apply