!   
!                Parallel Sparse BLAS  version 3.5
!      (C) Copyright 2006-2018
!        Salvatore Filippone    
!        Alfredo Buttari      
!   
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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_vect(method,a,prec,b,x,eps,desc_a,info,&
         & itmax,iter,err,itrace,irst,istop,cond)
      
      use psb_base_mod, only  : psb_ipk_, psb_desc_type, psb_sspmat_type, &
           & psb_spk_, psb_s_vect_type
      use psb_prec_mod, only : psb_sprec_type
      
      character(len=*)                      :: method
      Type(psb_sspmat_type), Intent(in)     :: a
      Type(psb_desc_type), Intent(in)       :: desc_a
      class(psb_sprec_type), intent(inout)  :: prec 
      type(psb_s_vect_type), Intent(inout)  :: b
      type(psb_s_vect_type), Intent(inout)  :: x
      Real(psb_spk_), Intent(in)            :: eps
      integer(psb_ipk_), intent(out)                  :: info
      integer(psb_ipk_), Optional, Intent(in)         :: itmax, itrace, irst,istop
      integer(psb_ipk_), Optional, Intent(out)        :: iter
      Real(psb_spk_), Optional, Intent(out) :: err,cond

    end Subroutine psb_skrylov_vect

    Subroutine psb_ckrylov_vect(method,a,prec,b,x,eps,desc_a,info,&
         & itmax,iter,err,itrace,irst,istop,cond)
      
      use psb_base_mod, only  : psb_ipk_, psb_desc_type, psb_cspmat_type, &
           & psb_spk_, psb_c_vect_type
      use psb_prec_mod, only : psb_cprec_type
      
      character(len=*)                      :: method
      Type(psb_cspmat_type), Intent(in)     :: a
      Type(psb_desc_type), Intent(in)       :: desc_a
      class(psb_cprec_type), intent(inout)  :: prec 
      type(psb_c_vect_type), Intent(inout)  :: b
      type(psb_c_vect_type), Intent(inout)  :: x
      Real(psb_spk_), Intent(in)            :: eps
      integer(psb_ipk_), intent(out)                  :: info
      integer(psb_ipk_), Optional, Intent(in)         :: itmax, itrace, irst,istop
      integer(psb_ipk_), Optional, Intent(out)        :: iter
      Real(psb_spk_), Optional, Intent(out) :: err,cond

    end Subroutine psb_ckrylov_vect

    Subroutine psb_dkrylov_vect(method,a,prec,b,x,eps,desc_a,info,&
         & itmax,iter,err,itrace,irst,istop,cond)
      
      use psb_base_mod, only  : psb_ipk_, psb_desc_type, psb_dspmat_type, &
           & psb_dpk_, psb_d_vect_type
      use psb_prec_mod, only : psb_dprec_type
      
      character(len=*)                      :: method
      Type(psb_dspmat_type), Intent(in)     :: a
      Type(psb_desc_type), Intent(in)       :: desc_a
      class(psb_dprec_type), intent(inout)  :: prec 
      type(psb_d_vect_type), Intent(inout)  :: b
      type(psb_d_vect_type), Intent(inout)  :: x
      Real(psb_dpk_), Intent(in)            :: eps
      integer(psb_ipk_), intent(out)                  :: info
      integer(psb_ipk_), Optional, Intent(in)         :: itmax, itrace, irst,istop
      integer(psb_ipk_), Optional, Intent(out)        :: iter
      Real(psb_dpk_), Optional, Intent(out) :: err,cond

    end Subroutine psb_dkrylov_vect

    Subroutine psb_zkrylov_vect(method,a,prec,b,x,eps,desc_a,info,&
         & itmax,iter,err,itrace,irst,istop,cond)
      
      use psb_base_mod, only  : psb_ipk_, psb_desc_type, psb_zspmat_type, &
           & psb_dpk_, psb_z_vect_type
      use psb_prec_mod, only : psb_zprec_type
      
      character(len=*)                      :: method
      Type(psb_zspmat_type), Intent(in)     :: a
      Type(psb_desc_type), Intent(in)       :: desc_a
      class(psb_zprec_type), intent(inout)  :: prec 
      type(psb_z_vect_type), Intent(inout)  :: b
      type(psb_z_vect_type), Intent(inout)  :: x
      Real(psb_dpk_), Intent(in)            :: eps
      integer(psb_ipk_), intent(out)                  :: info
      integer(psb_ipk_), Optional, Intent(in)         :: itmax, itrace, irst,istop
      integer(psb_ipk_), Optional, Intent(out)        :: iter
      Real(psb_dpk_), Optional, Intent(out) :: err,cond

    end Subroutine psb_zkrylov_vect

    Subroutine psb_dkrylov_multivect(method,a,prec,b,x,eps,desc_a,info,&
         & itmax,iter,err,itrace,itrs,istop)
      
      use psb_base_mod, only  : psb_ipk_, psb_desc_type, psb_dspmat_type, &
           & psb_dpk_, psb_d_multivect_type
      use psb_prec_mod, only : psb_dprec_type
      
      character(len=*)                          :: method
      Type(psb_dspmat_type), Intent(in)         :: a
      Type(psb_desc_type), Intent(in)           :: desc_a
      class(psb_dprec_type), intent(inout)      :: prec 
      type(psb_d_multivect_type), Intent(inout) :: b
      type(psb_d_multivect_type), Intent(inout) :: x
      Real(psb_dpk_), Intent(in)                :: eps
      integer(psb_ipk_), intent(out)            :: info
      integer(psb_ipk_), Optional, Intent(in)   :: itmax, itrace, itrs, istop
      integer(psb_ipk_), Optional, Intent(out)  :: iter
      Real(psb_dpk_), Optional, Intent(out)     :: err

    end Subroutine psb_dkrylov_multivect

  end interface


end module psb_krylov_mod