Inline counter wrapper

perf.h

#include <time.h>
#include <stdio.h>

/* In-place counter wrapper code */

#define begin_perf(time, idle_time, name) { \
        clock_t tstart = clock ();            \
        clock_t tcur = 0;                       \
        guint64 counter = 0;                     \
        int sec = -(idle_time);                   \
        putchar ('\n');                            \
        while (1)                                   \
        {                                            \
                counter++;                            \
                tcur = clock ();                        \
                if (time == -1)                           \
                {                                           \
                        printf ("clock doesn't work\n");      \
                        break;                                  \
                }                                                \
                if ( tcur - tstart >= CLOCKS_PER_SEC )            \
                {                                                  \
                        sec++;                                      \
                        tstart += CLOCKS_PER_SEC;                    \
                        if (sec <= 0)                                 \
                        {                                              \
                                counter = 0;                            \
                                continue;                                 \
                        }                                                   \
                        printf ("\r%s: %lu loops  ", (name), counter / sec); \
                        fflush (stdout);                                     \
                        if (sec >= (time))                                   \
                                break;                                       \
                }

#define end_perf        \
        }               \
        putchar ('\n'); \
}