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v/vlib/time/time_windows.c.v
Alexander Medvednikov 6756d28595 all: 2023 copyright
2023-03-28 22:55:57 +02:00

238 lines
5.6 KiB
V

// Copyright (c) 2019-2023 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
#include <time.h>
// #include <sysinfoapi.h>
struct C.tm {
tm_year int
tm_mon int
tm_mday int
tm_hour int
tm_min int
tm_sec int
}
pub struct C._FILETIME {
dwLowDateTime u32
dwHighDateTime u32
}
struct SystemTime {
year u16
month u16
day_of_week u16
day u16
hour u16
minute u16
second u16
millisecond u16
}
fn C.GetSystemTimeAsFileTime(lpSystemTimeAsFileTime &C._FILETIME)
fn C.FileTimeToSystemTime(lpFileTime &C._FILETIME, lpSystemTime &SystemTime)
fn C.SystemTimeToTzSpecificLocalTime(lpTimeZoneInformation &C.TIME_ZONE_INFORMATION, lpUniversalTime &SystemTime, lpLocalTime &SystemTime)
fn C.localtime_s(t &C.time_t, tm &C.tm)
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()
start_local_time = local_as_unix_time()
)
// in most systems, these are __quad_t, which is an i64
struct C.timespec {
tv_sec i64
tv_nsec i64
}
fn C.QueryPerformanceCounter(&u64) C.BOOL
fn C.QueryPerformanceFrequency(&u64) C.BOOL
fn make_unix_time(t C.tm) i64 {
return portable_timegm(&t)
}
fn init_win_time_freq() u64 {
f := u64(0)
C.QueryPerformanceFrequency(&f)
return f
}
fn init_win_time_start() u64 {
s := u64(0)
C.QueryPerformanceCounter(&s)
return s
}
// sys_mono_now returns a *monotonically increasing time*, NOT a time adjusted for daylight savings, location etc.
pub fn sys_mono_now() u64 {
tm := u64(0)
C.QueryPerformanceCounter(&tm) // XP or later never fail
return (tm - time.start_time) * 1000000000 / time.freq_time
}
// Note: 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
}
// local_as_unix_time returns the current local time as unix time
fn local_as_unix_time() i64 {
t := C.time(0)
tm := C.localtime(&t)
return make_unix_time(tm)
}
// local - return the time `t`, converted to the currently active local timezone
pub fn (t Time) local() Time {
if t.is_local {
return t
}
st_utc := SystemTime{
year: u16(t.year)
month: u16(t.month)
day: u16(t.day)
hour: u16(t.hour)
minute: u16(t.minute)
second: u16(t.second)
millisecond: u16(t.microsecond / 1000)
}
st_local := SystemTime{}
C.SystemTimeToTzSpecificLocalTime(unsafe { nil }, &st_utc, &st_local)
t_local := Time{
year: st_local.year
month: st_local.month
day: st_local.day
hour: st_local.hour
minute: st_local.minute
second: st_local.second // These are the same
microsecond: st_local.millisecond * 1000
unix: st_local.unix_time()
}
return t_local
}
// win_now calculates current time using winapi to get higher resolution on windows
// GetSystemTimeAsFileTime is used and converted to local time. It can resolve time
// down to millisecond. Other more precice methods can be implemented in the future
fn win_now() Time {
ft_utc := C._FILETIME{}
C.GetSystemTimeAsFileTime(&ft_utc)
st_utc := SystemTime{}
C.FileTimeToSystemTime(&ft_utc, &st_utc)
st_local := SystemTime{}
C.SystemTimeToTzSpecificLocalTime(unsafe { nil }, &st_utc, &st_local)
t := Time{
year: st_local.year
month: st_local.month
day: st_local.day
hour: st_local.hour
minute: st_local.minute
second: st_local.second
microsecond: st_local.millisecond * 1000
unix: st_local.unix_time()
is_local: true
}
return t
}
// win_utc calculates current time using winapi to get higher resolution on windows
// GetSystemTimeAsFileTime is used. It can resolve time down to millisecond
// other more precice methods can be implemented in the future
fn win_utc() Time {
ft_utc := C._FILETIME{}
C.GetSystemTimeAsFileTime(&ft_utc)
st_utc := SystemTime{}
C.FileTimeToSystemTime(&ft_utc, &st_utc)
t := Time{
year: st_utc.year
month: st_utc.month
day: st_utc.day
hour: st_utc.hour
minute: st_utc.minute
second: st_utc.second
microsecond: st_utc.millisecond * 1000
unix: st_utc.unix_time()
is_local: false
}
return t
}
// unix_time returns Unix time.
pub fn (st SystemTime) unix_time() i64 {
tt := C.tm{
tm_sec: st.second
tm_min: st.minute
tm_hour: st.hour
tm_mday: st.day
tm_mon: st.month - 1
tm_year: st.year - 1900
}
return make_unix_time(tt)
}
// dummy to compile with all compilers
pub fn darwin_now() Time {
return Time{}
}
// dummy to compile with all compilers
pub fn linux_now() Time {
return Time{}
}
// dummy to compile with all compilers
pub fn solaris_now() Time {
return Time{}
}
// dummy to compile with all compilers
pub fn darwin_utc() Time {
return Time{}
}
// dummy to compile with all compilers
pub fn linux_utc() Time {
return Time{}
}
// dummy to compile with all compilers
pub fn solaris_utc() Time {
return Time{}
}
// dummy to compile with all compilers
pub struct C.timeval {
tv_sec u64
tv_usec u64
}
// sleep makes the calling thread sleep for a given duration (in nanoseconds).
pub fn sleep(duration Duration) {
C.Sleep(int(duration / millisecond))
}
// some Windows system functions (e.g. `C.WaitForSingleObject()`) accept an `u32`
// value as *timeout in milliseconds* with the special value `u32(-1)` meaning "infinite"
pub fn (d Duration) sys_milliseconds() u32 {
if d >= u32(-1) * millisecond { // treat 4294967295000000 .. C.INT64_MAX as "infinite"
return u32(-1)
} else if d <= 0 {
return 0 // treat negative timeouts as 0 - consistent with Unix behaviour
} else {
return u32(d / millisecond)
}
}