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evutil_time: improve evutil_gettimeofday on Windows

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If present, use GetSystemTimePreciseAsFileTime instead of
GetSystemTimeAsFileTime. Available since Windows 8.
This commit is contained in:
Nick Grifka 2020-04-27 15:02:25 -07:00 committed by Azat Khuzhin
parent 5caffa7a5b
commit f0b3160f8c
1 changed files with 19 additions and 1 deletions
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20
evutil_time.c
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@ -65,6 +65,9 @@
#ifndef EVENT__HAVE_GETTIMEOFDAY
/* No gettimeofday; this must be windows. */
typedef void (WINAPI *GetSystemTimePreciseAsFileTime_fn_t) (LPFILETIME);
int
evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
{
@ -90,7 +93,22 @@ evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
if (tv == NULL)
return -1;
GetSystemTimeAsFileTime(&ft.ft_ft);
static GetSystemTimePreciseAsFileTime_fn_t GetSystemTimePreciseAsFileTime_fn = NULL;
static int check_precise = 1;
if (EVUTIL_UNLIKELY(check_precise)) {
HMODULE h = evutil_load_windows_system_library_(TEXT("kernel32.dll"));
if (h != NULL)
GetSystemTimePreciseAsFileTime_fn =
(GetSystemTimePreciseAsFileTime_fn_t)
GetProcAddress(h, "GetSystemTimePreciseAsFileTime");
check_precise = 0;
}
if (GetSystemTimePreciseAsFileTime_fn != NULL)
GetSystemTimePreciseAsFileTime_fn(&ft.ft_ft);
else
GetSystemTimeAsFileTime(&ft.ft_ft);
if (EVUTIL_UNLIKELY(ft.ft_64 < EPOCH_BIAS)) {
/* Time before the unix epoch. */