!                Parallel Sparse BLAS   GPU plugin 
!      (C) Copyright 2013
!  
!                         Salvatore Filippone
!                         Alessandro Fanfarillo
!   
!    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 PSBLAS 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 PSBLAS 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.
!   
  

subroutine psb_z_ell_reinit(a,clear)
  
  use psb_base_mod
  use psb_z_ell_mat_mod, psb_protect_name => psb_z_ell_reinit
  implicit none 

  class(psb_z_ell_sparse_mat), intent(inout) :: a   
  logical, intent(in), optional :: clear

  Integer(Psb_ipk_)  :: err_act, info
  character(len=20)  :: name='reinit'
  logical            :: clear_
  logical, parameter :: debug=.false.

  call psb_erractionsave(err_act)
  info = psb_success_


  if (present(clear)) then 
    clear_ = clear
  else
    clear_ = .true.
  end if

  if (a%is_bld() .or. a%is_upd()) then 
    ! do nothing
    return
  else if (a%is_asb()) then 
    if (a%is_dev()) call a%sync()
    if (clear_) a%val(:,:) = zzero
    call a%set_upd()
    call a%set_host()
  else
    info = psb_err_invalid_mat_state_
    call psb_errpush(info,name)
    goto 9999
  end if

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)
  return

end subroutine psb_z_ell_reinit