v/vlib/time/time_windows.c.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module time
struct C.tm {
tm_year int
tm_mon int
tm_mday int
tm_hour int
tm_min int
tm_sec int
}
const (
// start_time is needed on Darwin and Windows because of potential overflows
start_time = init_win_time_start()
freq_time = init_win_time_freq()
)
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fn C._mkgmtime(&C.tm) time_t
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fn C.QueryPerformanceCounter(&u64) C.BOOL
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fn C.QueryPerformanceFrequency(&u64) C.BOOL
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fn make_unix_time(t C.tm) int {
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return int(C._mkgmtime(&t))
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}
fn init_win_time_freq() u64 {
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f := u64(0)
C.QueryPerformanceFrequency(&f)
return f
}
fn init_win_time_start() u64 {
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s := u64(0)
C.QueryPerformanceCounter(&s)
return s
}
pub fn sys_mono_now() u64 {
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tm := u64(0)
C.QueryPerformanceCounter(&tm) // XP or later never fail
return (tm - start_time) * 1_000_000_000 / freq_time
}
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// NB: vpc_now is used by `v -profile` .
// It should NOT call *any other v function*, just C functions and casts.
[inline]
fn vpc_now() u64 {
tm := u64(0)
C.QueryPerformanceCounter(&tm)
return tm
}