!!$
!!$ 
!!$                           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
!!$ 
!!$  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
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!!$ 
!!$


subroutine z_mumps_solver_apply(alpha,sv,x,beta,y,desc_data,trans,work,info)
    use psb_base_mod
    use mld_z_mumps_solver
    implicit none 
    type(psb_desc_type), intent(in)      :: desc_data
    class(mld_z_mumps_solver_type), intent(inout) :: sv
    complex(psb_dpk_),intent(inout)         :: x(:)
    complex(psb_dpk_),intent(inout)         :: y(:)
    complex(psb_dpk_),intent(in)            :: alpha,beta
    character(len=1),intent(in)          :: trans
    complex(psb_dpk_),target, intent(inout) :: work(:)
    integer(psb_ipk_), intent(out)       :: info

    integer(psb_ipk_)  :: n_row, n_col, nglob
    complex(psb_dpk_), allocatable     :: ww(:)
    complex(psb_dpk_), allocatable, target :: gx(:)
    integer(psb_ipk_)  :: ictxt,np,me,i, err_act
    character          :: trans_
    character(len=20)  :: name='z_mumps_solver_apply'

    call psb_erractionsave(err_act)

#if defined(HAVE_MUMPS_)
    info = psb_success_
    trans_ = psb_toupper(trans)
    select case(trans_)
    case('N')
    case('T')
    case default
      call psb_errpush(psb_err_iarg_invalid_i_,name)
      goto 9999
    end select

    nglob = desc_data%get_global_rows()
    n_row = desc_data%get_local_rows()
    n_col = desc_data%get_local_cols()

    if (n_col <= size(work)) then 
      ww = work(1:n_col)
    else
      allocate(ww(n_col),stat=info)
      if (info /= psb_success_) then 
        info=psb_err_alloc_request_
        call psb_errpush(info,name,i_err=(/n_col,0,0,0,0/),&
             & a_err='complex(psb_dpk_)')
        goto 9999      
      end if
    end if
    allocate(gx(nglob),stat=info)
    if (info /= psb_success_) then 
       info=psb_err_alloc_request_
       call psb_errpush(info,name,i_err=(/nglob,0,0,0,0/),&
             & a_err='complex(psb_dpk_)')
       goto 9999      
    end if
    call psb_gather(gx, x, desc_data, info, root=0)
    select case(trans_)
    case('N')
      sv%id%icntl(9) = 1
    case('T')
      sv%id%icntl(9) = 2
    case default
      call psb_errpush(psb_err_internal_error_,&
           & name,a_err='Invalid TRANS in subsolve')
      goto 9999
    end select

    sv%id%rhs  => gx
    sv%id%nrhs =  1
    sv%id%icntl(1)=-1
    sv%id%icntl(2)=-1
    sv%id%icntl(3)=-1
    sv%id%icntl(4)=-1
    sv%id%job = 3
    call zmumps(sv%id)
    call psb_scatter(gx, ww, desc_data, info, root=0)
    
    if (info == psb_success_) then
          call psb_geaxpby(alpha,ww,beta,y,desc_data,info)
      end if

    if (info /= psb_success_) then
      call psb_errpush(psb_err_internal_error_,&
           & name,a_err='Error in subsolve')
      goto 9999
    endif

    if (nglob > size(work)) then 
      deallocate(ww)
    endif

    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

#else
    write(psb_err_unit,*) "MUMPS Not Configured, fix make.inc and recompile "
#endif
  end subroutine z_mumps_solver_apply