关于win32 gettimeofday替代方案

来自nginx代码：

void
ngx_gettimeofday(struct timeval *tp)
{
  uint64_t intervals;
  FILETIME ft;

  GetSystemTimeAsFileTime(&ft);

  

  intervals = ((uint64_t) ft.dwHighDateTime << 32) | ft.dwLowDateTime;
  intervals -= 116444736000000000;

  tp->tv_sec = (long) (intervals / 10000000);
  tp->tv_usec = (long) ((intervals % 10000000) / 10);
}

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