#include "project.h"

#define SLEEP_MIN 100000
#define THRESH 1000

void sync_to_second (struct timeval *ret)
{
  struct timeval tv1, tv2;
  ret->tv_usec = 0;

  for (;;) {
    tv2.tv_sec = 0;
    gettimeofday (&tv1, NULL);
    tv2.tv_usec = 1000000 - tv1.tv_usec;

    if (tv1.tv_usec < THRESH) {
      ret->tv_sec = tv1.tv_sec;
      return;
    } else if (tv2.tv_usec < THRESH) {
      ret->tv_sec = tv1.tv_sec + 1;
      return;
    }

#ifdef __WINNT__
    usleep (tv2.tv_usec / 2);
#else

    if (tv2.tv_usec > SLEEP_MIN)
      select (0, NULL, NULL, NULL, &tv2);
    else
      usleep (tv2.tv_usec / 2);

#endif
  }
}



void sync_to_minute (struct timeval *ret)
{
  struct timeval tv1, tv2;
  ret->tv_usec = 0;

  for (;;) {
    tv2.tv_sec = 0;
    gettimeofday (&tv1, NULL);
    tv2.tv_sec = 60 - (tv1.tv_sec % 60);
    tv2.tv_usec = 1000;

    printf ("%d seconds left in min\n", (int) tv2.tv_sec);

    if (tv2.tv_sec > 1) {
      tv2.tv_sec /= 2;
#ifdef __WINNT__
      sleep (tv2.tv_sec);
#else
      select (0, NULL, NULL, NULL, &tv2);
#endif
    } else {
      sync_to_second (ret);
      return;
    }
  }
}