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v/vlib/time/time_windows.c.v
2020-04-24 07:33:25 +02:00

60 lines
1.3 KiB
V

// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// 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
}
[typedef]
struct C.LARGE_INTEGER {
QuadPart i64
}
const (
// start_time is needed on Darwin and Windows because of potential overflows
// Windows: don't store the LARGE_INTEGER, just the QuadPart
start_time = init_win_time_start()
freq_time = init_win_time_freq()
)
fn C._mkgmtime(&C.tm) time_t
fn C.QueryPerformanceCounter(&C.LARGE_INTEGER) C.BOOL
fn C.QueryPerformanceFrequency(&C.LARGE_INTEGER) C.BOOL
fn make_unix_time(t C.tm) int {
return int(C._mkgmtime(&t))
}
fn init_win_time_freq() u64 {
mut f := C.LARGE_INTEGER{}
_ := C.QueryPerformanceFrequency(&f)
return u64(f.QuadPart)
}
fn init_win_time_start() u64 {
mut s := C.LARGE_INTEGER{}
_ := C.QueryPerformanceCounter(&s)
return u64(s.QuadPart)
}
fn sys_mono_now() u64 {
mut tm := C.LARGE_INTEGER{}
_ := C.QueryPerformanceCounter(&tm) // XP or later never fail
return mul_div(u64(tm.QuadPart) - start_time, 1_000_000_000, freq_time)
}
fn mul_div(val, numer, denom u64) u64 {
q := val / denom
r := val % denom
return q * numer + r * numer / denom
}