timing.h

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#ifndef GHOST_TIMING_H
#define GHOST_TIMING_H

#include <float.h>

#include "error.h"

#ifndef MIN
#define MIN(x,y) ((x)<(y)?(x):(y))
#endif
#ifndef MAX
#define MAX(x,y) ((x)<(y)?(y):(x))
#endif

#define GHOST_TIME(nIter,func,...) \
    double func ## _start, func ## _end, func ## _tstart, func ## _tend;\
double func ## _tmin = DBL_MAX;\
double func ## _tmax = 0.;\
double func ## _tavg = 0.;\
int func ## _it;\
ghost_timing_wc(&func ## _tstart);\
for (func ## _it=0; func ## _it<nIter; func ## _it++) {\
    ghost_timing_wc(&func ## _start);\
    func(__VA_ARGS__);\
    ghost_timing_wc(&func ## _end);\
    func ## _tmin = MIN(func ## _end-func ## _start,func ## _tmin);\
    func ## _tmax = MAX(func ## _end-func ## _start,func ## _tmax);\
}\
ghost_timing_wc(&func ## _tend);\
func ## _tavg = (func ## _tend - func ## _tstart)/((double)nIter);\

typedef int (*ghost_compute_performance_func)(double *perf, double time, void *arg);

typedef struct
{
    int nCalls;
    double *times;
    double avgTime;
    double minTime;
    double maxTime;
    double accTime;
    double skip10avgTime;
    
}
ghost_timing_region;

#ifdef __cplusplus
extern "C" {
#endif

    void ghost_timing_tick(const char *tag);
    void ghost_timing_tock(const char *tag);
    ghost_error ghost_timing_summarystring(char **str);
    ghost_error ghost_timing_region_create(ghost_timing_region ** region, const char *tag);
    void ghost_timing_region_destroy(ghost_timing_region * region);

    ghost_error ghost_timing_wc(double *time);
    ghost_error ghost_timing_wcmilli(double *time);

    void ghost_timing_set_perfFunc(const char *prefix, const char *tag, ghost_compute_performance_func func, void *arg, size_t sizeofarg, const char *unit);

    void ghost_timing_destroy();

    ghost_error ghost_timing_start();
    ghost_error ghost_timing_elapsed(double *time);

#ifdef __cplusplus
}
#endif
#endif