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use crate::cmp::Ordering;
use crate::time::Duration;
use core::hash::{Hash, Hasher};
pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
use crate::convert::TryInto;
const NSEC_PER_SEC: u64 = 1_000_000_000;
#[derive(Copy, Clone)]
struct Timespec {
t: libc::timespec,
}
impl Timespec {
const fn zero() -> Timespec {
Timespec { t: libc::timespec { tv_sec: 0, tv_nsec: 0 } }
}
fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
if self >= other {
Ok(if self.t.tv_nsec >= other.t.tv_nsec {
Duration::new(
(self.t.tv_sec - other.t.tv_sec) as u64,
(self.t.tv_nsec - other.t.tv_nsec) as u32,
)
} else {
Duration::new(
(self.t.tv_sec - 1 - other.t.tv_sec) as u64,
self.t.tv_nsec as u32 + (NSEC_PER_SEC as u32) - other.t.tv_nsec as u32,
)
})
} else {
match other.sub_timespec(self) {
Ok(d) => Err(d),
Err(d) => Ok(d),
}
}
}
fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
let mut secs = other
.as_secs()
.try_into() // <- target type would be `libc::time_t`
.ok()
.and_then(|secs| self.t.tv_sec.checked_add(secs))?;
// Nano calculations can't overflow because nanos are <1B which fit
// in a u32.
let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
if nsec >= NSEC_PER_SEC as u32 {
nsec -= NSEC_PER_SEC as u32;
secs = secs.checked_add(1)?;
}
Some(Timespec { t: libc::timespec { tv_sec: secs, tv_nsec: nsec as _ } })
}
fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
let mut secs = other
.as_secs()
.try_into() // <- target type would be `libc::time_t`
.ok()
.and_then(|secs| self.t.tv_sec.checked_sub(secs))?;
// Similar to above, nanos can't overflow.
let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;
if nsec < 0 {
nsec += NSEC_PER_SEC as i32;
secs = secs.checked_sub(1)?;
}
Some(Timespec { t: libc::timespec { tv_sec: secs, tv_nsec: nsec as _ } })
}
}
impl PartialEq for Timespec {
fn eq(&self, other: &Timespec) -> bool {
self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
}
}
impl Eq for Timespec {}
impl PartialOrd for Timespec {
fn partial_cmp(&self, other: &Timespec) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Timespec {
fn cmp(&self, other: &Timespec) -> Ordering {
let me = (self.t.tv_sec, self.t.tv_nsec);
let other = (other.t.tv_sec, other.t.tv_nsec);
me.cmp(&other)
}
}
impl Hash for Timespec {
fn hash<H: Hasher>(&self, state: &mut H) {
self.t.tv_sec.hash(state);
self.t.tv_nsec.hash(state);
}
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
mod inner {
use crate::fmt;
use crate::mem;
use crate::sync::atomic::{AtomicUsize, Ordering::SeqCst};
use crate::sys::cvt;
use crate::sys_common::mul_div_u64;
use crate::time::Duration;
use super::Timespec;
use super::NSEC_PER_SEC;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct Instant {
t: u64,
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SystemTime {
t: Timespec,
}
pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
#[repr(C)]
#[derive(Copy, Clone)]
struct mach_timebase_info {
numer: u32,
denom: u32,
}
type mach_timebase_info_t = *mut mach_timebase_info;
type kern_return_t = libc::c_int;
impl Instant {
pub fn now() -> Instant {
extern "C" {
fn mach_absolute_time() -> u64;
}
Instant { t: unsafe { mach_absolute_time() } }
}
pub const fn zero() -> Instant {
Instant { t: 0 }
}
pub fn actually_monotonic() -> bool {
true
}
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
let diff = self.t.checked_sub(other.t)?;
let info = info();
let nanos = mul_div_u64(diff, info.numer as u64, info.denom as u64);
Some(Duration::new(nanos / NSEC_PER_SEC, (nanos % NSEC_PER_SEC) as u32))
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_add(checked_dur2intervals(other)?)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_sub(checked_dur2intervals(other)?)? })
}
}
impl SystemTime {
pub fn now() -> SystemTime {
use crate::ptr;
let mut s = libc::timeval { tv_sec: 0, tv_usec: 0 };
cvt(unsafe { libc::gettimeofday(&mut s, ptr::null_mut()) }).unwrap();
return SystemTime::from(s);
}
pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
self.t.sub_timespec(&other.t)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_add_duration(other)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_sub_duration(other)? })
}
}
impl From<libc::timeval> for SystemTime {
fn from(t: libc::timeval) -> SystemTime {
SystemTime::from(libc::timespec {
tv_sec: t.tv_sec,
tv_nsec: (t.tv_usec * 1000) as libc::c_long,
})
}
}
impl From<libc::timespec> for SystemTime {
fn from(t: libc::timespec) -> SystemTime {
SystemTime { t: Timespec { t } }
}
}
impl fmt::Debug for SystemTime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("SystemTime")
.field("tv_sec", &self.t.t.tv_sec)
.field("tv_nsec", &self.t.t.tv_nsec)
.finish()
}
}
fn checked_dur2intervals(dur: &Duration) -> Option<u64> {
let nanos =
dur.as_secs().checked_mul(NSEC_PER_SEC)?.checked_add(dur.subsec_nanos() as u64)?;
let info = info();
Some(mul_div_u64(nanos, info.denom as u64, info.numer as u64))
}
fn info() -> mach_timebase_info {
static mut INFO: mach_timebase_info = mach_timebase_info { numer: 0, denom: 0 };
static STATE: AtomicUsize = AtomicUsize::new(0);
unsafe {
// If a previous thread has filled in this global state, use that.
if STATE.load(SeqCst) == 2 {
return INFO;
}
// ... otherwise learn for ourselves ...
let mut info = mem::zeroed();
extern "C" {
fn mach_timebase_info(info: mach_timebase_info_t) -> kern_return_t;
}
mach_timebase_info(&mut info);
// ... and attempt to be the one thread that stores it globally for
// all other threads
if STATE.compare_exchange(0, 1, SeqCst, SeqCst).is_ok() {
INFO = info;
STATE.store(2, SeqCst);
}
return info;
}
}
}
#[cfg(not(any(target_os = "macos", target_os = "ios")))]
mod inner {
use crate::fmt;
use crate::sys::cvt;
use crate::time::Duration;
use super::Timespec;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Instant {
t: Timespec,
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct SystemTime {
t: Timespec,
}
pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
impl Instant {
pub fn now() -> Instant {
Instant { t: now(libc::CLOCK_MONOTONIC) }
}
pub const fn zero() -> Instant {
Instant { t: Timespec::zero() }
}
pub fn actually_monotonic() -> bool {
(cfg!(target_os = "linux") && cfg!(target_arch = "x86_64"))
|| (cfg!(target_os = "linux") && cfg!(target_arch = "x86"))
|| cfg!(target_os = "fuchsia")
|| false // last clause, used so `||` is always trailing above
}
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
self.t.sub_timespec(&other.t).ok()
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_add_duration(other)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_sub_duration(other)? })
}
}
impl fmt::Debug for Instant {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Instant")
.field("tv_sec", &self.t.t.tv_sec)
.field("tv_nsec", &self.t.t.tv_nsec)
.finish()
}
}
impl SystemTime {
pub fn now() -> SystemTime {
SystemTime { t: now(libc::CLOCK_REALTIME) }
}
pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
self.t.sub_timespec(&other.t)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_add_duration(other)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_sub_duration(other)? })
}
}
impl From<libc::timespec> for SystemTime {
fn from(t: libc::timespec) -> SystemTime {
SystemTime { t: Timespec { t } }
}
}
impl fmt::Debug for SystemTime {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("SystemTime")
.field("tv_sec", &self.t.t.tv_sec)
.field("tv_nsec", &self.t.t.tv_nsec)
.finish()
}
}
#[cfg(not(target_os = "dragonfly"))]
pub type clock_t = libc::c_int;
#[cfg(target_os = "dragonfly")]
pub type clock_t = libc::c_ulong;
fn now(clock: clock_t) -> Timespec {
let mut t = Timespec { t: libc::timespec { tv_sec: 0, tv_nsec: 0 } };
cvt(unsafe { libc::clock_gettime(clock, &mut t.t) }).unwrap();
t
}
}
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