timer.h

#pragma once

#include <signal.h>   // for __sigval_t
#include <stdbool.h>  // for bool

void tick_create(void (*callback)(__sigval_t sigval), unsigned sec, unsigned nsec,
                 bool once);


// clang-format off
#define MSEC_TO_NSEC(x) ((x) * 1000000L)
#define NSEC_TO_MSEC(x) ((x) / 1000000L)
#define SEC_TO_MSEC(x) ((x) * 1000)
// clang-format on
#define SECS_IN_DAY (24 * 60 * 60)


#define timespecsub(finish, start, diff)                                                 \
    do                                                                                   \
    {                                                                                    \
        (diff)->tv_sec = (finish)->tv_sec - (start)->tv_sec;                             \
        (diff)->tv_nsec = (finish)->tv_nsec - (start)->tv_nsec;                          \
        if ((diff)->tv_nsec < 0)                                                         \
        {                                                                                \
            (diff)->tv_sec--;                                                            \
            (diff)->tv_nsec += 1000000000L;                                              \
        }                                                                                \
    } while (0)

#define timespeccmp(tsp, usp, cmp)                                                       \
    (((tsp)->tv_sec == (usp)->tv_sec) ? ((tsp)->tv_nsec cmp(usp)->tv_nsec)               \
                                      : ((tsp)->tv_sec cmp(usp)->tv_sec))

#define timespecadd(start, inc, output)                                                  \
    do                                                                                   \
    {                                                                                    \
        (output)->tv_sec = (start)->tv_sec + (inc)->tv_sec;                              \
        (output)->tv_nsec = (start)->tv_nsec + (inc)->tv_nsec;                           \
        if ((output)->tv_nsec >= 1000000000L)                                            \
        {                                                                                \
            (output)->tv_sec++;                                                          \
            (output)->tv_nsec -= 1000000000L;                                            \
        }                                                                                \
    } while (0)