关于win32 gettimeofday替代方案
来自nginx代码：
void
ngx_gettimeofday(structtimeval*tp)
{
uint64_tintervals;
FILETIMEft;
GetSystemTimeAsFileTime(&ft);
/*
*Afiletimeisa64-bitvaluethatrepresentsthenumber
*of100-nanosecondintervalsthathaveelapsedsince
*January1,160112:00A.M.UTC.
*
*BetweenJanuary1,1970(Epoch)andJanuary1,1601therewere
*134744days,
*11644473600secondsor
*11644473600,000,000,0100-nanosecondintervals.
*
*SeealsoMSKBQ167296.
*/
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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