KPAPreconditioner.h

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#ifndef HEX_KPAPRECONDITIONER_H
#define HEX_KPAPRECONDITIONER_H

// --------------------------------------------------------------------------------- //

#include <deque>
#include <set>
#include <string>
#include <vector>

// --------------------------------------------------------------------------------- //

#include "hex-arrays.h"
#include "hex-matrix.h"

// --------------------------------------------------------------------------------- //

#include "CGPreconditioner.h"

// --------------------------------------------------------------------------------- //

class KPACGPreconditioner : public virtual CGPreconditioner
{
    public:
        
        // run-time selection mechanism
        preconditionerRunTimeSelectionDefinitions(KPACGPreconditioner, "KPA")
        
        // default constructor needed by the RTS mechanism
        KPACGPreconditioner () {}
        
        // constructor
        KPACGPreconditioner
        (
            CommandLine  const & cmd,
            InputFile    const & inp,
            Parallel     const & par,
            AngularBasis const & ang,
            Bspline const & bspline_inner,
            Bspline const & bspline_full,
            Bspline const & bspline_panel_x,
            Bspline const & bspline_panel_y
        ) : CGPreconditioner
            (
                cmd, inp, par, ang,
                bspline_inner,
                bspline_full,
                bspline_panel_x,
                bspline_panel_y
            ),
            refcount_atom_(inp.maxell + 1),
            refcount_proj_(inp.maxell + 1)
        {
#ifdef _OPENMP
            omp_init_lock(&lck_);
#endif
        }
        
        virtual ~KPACGPreconditioner ()
        {
#ifdef _OPENMP
            omp_destroy_lock(&lck_);
#endif
        }
        
        // preconditioner description
        virtual std::string description () const;
        
        // reuse parent definitions
        using CGPreconditioner::update;
        using CGPreconditioner::rhs;
        using CGPreconditioner::multiply;
        using CGPreconditioner::precondition;
        using CGPreconditioner::CG_mmul;
        using CGPreconditioner::CG_constrain;
        
        // declare own definitions
        virtual void setup ();
        virtual void finish ();
        
        // inner CG callback (needed by parent)
        virtual void CG_init (int iblock) const;
        virtual void CG_prec (int iblock, const cArrayView r, cArrayView z) const;
        virtual void CG_exit (int iblock) const;
        
    protected:
        
        // internal concurrent access lock
        void lock_kpa_access () const;
        void unlock_kpa_access () const;
        
        // preconditioner data
        mutable iArray refcount_atom_, refcount_proj_;
        
        // memory access lock
#ifdef _OPENMP
        mutable omp_lock_t lck_;
#endif
        
        // workspace
        mutable cArrays workspace_;
};

// --------------------------------------------------------------------------------- //

#endif