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#+private
package time
import win32 "core:sys/windows"
_IS_SUPPORTED :: true
_now :: proc "contextless" () -> Time {
file_time: win32.FILETIME
ns: i64
// monotonic
win32.GetSystemTimePreciseAsFileTime(&file_time)
dt := u64(transmute(u64le)file_time) // in 100ns units
ns = i64((dt - 116444736000000000) * 100) // convert to ns
return unix(0, ns)
}
_sleep :: proc "contextless" (d: Duration) {
win32.Sleep(win32.DWORD(d/Millisecond))
}
_tick_now :: proc "contextless" () -> Tick {
mul_div_u64 :: proc "contextless" (val, num, den: i64) -> i64 {
q := val / den
r := val % den
return q * num + r * num / den
}
@thread_local qpc_frequency: win32.LARGE_INTEGER
if qpc_frequency == 0 {
win32.QueryPerformanceFrequency(&qpc_frequency)
}
now: win32.LARGE_INTEGER
win32.QueryPerformanceCounter(&now)
_nsec := mul_div_u64(i64(now), 1e9, i64(qpc_frequency))
return Tick{_nsec = _nsec}
}
_yield :: proc "contextless" () {
win32.SwitchToThread()
}
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