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!!$              Parallel Sparse BLAS  version 2.2
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!!$                       Salvatore Filippone    University of Rome Tor Vergata
!!$                       Alfredo Buttari        University of Rome Tor Vergata
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!
! File: psb_krylov_mod.f90
!  Interfaces for Krylov subspace iterative methods.
!
Module psb_krylov_mod

  use psb_const_mod
  public 

  interface psb_krylov
    
    Subroutine psb_skrylov(method,a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,irst,istop,cond)
      use psb_sparse_mod, only  : psb_desc_type, psb_s_sparse_mat, psb_spk_
      use psb_prec_mod,only : psb_sprec_type, psb_dprec_type, psb_cprec_type, psb_zprec_type
      
      character(len=*)                   :: method
      Type(psb_s_sparse_mat), Intent(in)  :: a
      Type(psb_desc_type), Intent(in)    :: desc_a
      class(psb_sprec_type), intent(in)   :: prec 
      Real(psb_spk_), Intent(in)       :: b(:)
      Real(psb_spk_), Intent(inout)    :: x(:)
      Real(psb_spk_), Intent(in)       :: eps
      integer, intent(out)               :: info
      Integer, Optional, Intent(in)      :: itmax, itrace, irst,istop
      Integer, Optional, Intent(out)     :: iter
      Real(psb_spk_), Optional, Intent(out) :: err,cond
    end Subroutine psb_skrylov
    Subroutine psb_ckrylov(method,a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,irst,istop)
      use psb_sparse_mod, only  : psb_desc_type, psb_c_sparse_mat, psb_spk_
      use psb_prec_mod,only : psb_sprec_type, psb_dprec_type, psb_cprec_type, psb_zprec_type
      character(len=*)                   :: method
      Type(psb_c_sparse_mat), Intent(in)  :: a
      Type(psb_desc_type), Intent(in)    :: desc_a
      class(psb_cprec_type), intent(in)   :: prec 
      complex(psb_spk_), Intent(in)      :: b(:)
      complex(psb_spk_), Intent(inout)   :: x(:)
      Real(psb_spk_), Intent(in)         :: eps
      integer, intent(out)               :: info
      Integer, Optional, Intent(in)      :: itmax, itrace, irst,istop
      Integer, Optional, Intent(out)     :: iter
      Real(psb_spk_), Optional, Intent(out) :: err
    end Subroutine psb_ckrylov
    Subroutine psb_dkrylov(method,a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,irst,istop,cond)
      
      use psb_sparse_mod, only  : psb_desc_type, psb_d_sparse_mat, psb_dpk_
      use psb_prec_mod,only : psb_sprec_type, psb_dprec_type, psb_cprec_type, psb_zprec_type
      
      character(len=*)                   :: method
      Type(psb_d_sparse_mat), Intent(in)  :: a
      Type(psb_desc_type), Intent(in)    :: desc_a
      class(psb_dprec_type), intent(in)   :: prec 
      Real(psb_dpk_), Intent(in)       :: b(:)
      Real(psb_dpk_), Intent(inout)    :: x(:)
      Real(psb_dpk_), Intent(in)       :: eps
      integer, intent(out)               :: info
      Integer, Optional, Intent(in)      :: itmax, itrace, irst,istop
      Integer, Optional, Intent(out)     :: iter
      Real(psb_dpk_), Optional, Intent(out) :: err,cond

    end Subroutine psb_dkrylov
    Subroutine psb_zkrylov(method,a,prec,b,x,eps,desc_a,info,itmax,iter,err,itrace,irst,istop)
      use psb_sparse_mod, only  : psb_desc_type, psb_z_sparse_mat, psb_dpk_
      use psb_prec_mod,only : psb_sprec_type, psb_dprec_type, psb_cprec_type, psb_zprec_type
      character(len=*)                   :: method
      Type(psb_z_sparse_mat), Intent(in)  :: a
      Type(psb_desc_type), Intent(in)    :: desc_a
      class(psb_zprec_type), intent(in)   :: prec 
      complex(psb_dpk_), Intent(in)    :: b(:)
      complex(psb_dpk_), Intent(inout) :: x(:)
      Real(psb_dpk_), Intent(in)       :: eps
      integer, intent(out)               :: info
      Integer, Optional, Intent(in)      :: itmax, itrace, irst,istop
      Integer, Optional, Intent(out)     :: iter
      Real(psb_dpk_), Optional, Intent(out) :: err
    end Subroutine psb_zkrylov

  end interface


end module psb_krylov_mod