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);
/*
* A file time is a 64-bit value that represents the number
* of 100-nanosecond intervals that have elapsed since
* January 1, 1601 12:00 A.M. UTC.
*
* Between January 1, 1970 (Epoch) and January 1, 1601 there were
* 134744 days,
* 11644473600 seconds or
* 11644473600,000,000,0 100-nanosecond intervals.
*
* See also MSKB Q167296.
*/
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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