src_c/pcg.h

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#ifndef PCG_H
#define PCG_H

#ifdef __cplusplus
extern "C" {
#endif

typedef struct {
    int flag;           
    int iter;           
    double relres;      
} pcg_status_t;

/* defines for pcg_status.flag */
#define PCG_INIT        (-1)
#define PCG_OK          (0)
#define PCG_MAXITER     (1)

void init_pcg_status(pcg_status_t *pstst);

int pcg(double *x, pcg_status_t *pstat,
        void (*afun)(double*, const double*, const void*), const void* adata,
        void (*mfun)(double*, const double*, const void*), const void* mdata,
        double *b, double tol, double maxiter, int n);

#ifdef __cplusplus
}
#endif

#endif /* PCG_H */

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