mv std libs to library/
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875 changed files with 1255 additions and 1223 deletions
352
library/std/src/sys/unix/time.rs
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352
library/std/src/sys/unix/time.rs
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use crate::cmp::Ordering;
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use crate::time::Duration;
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use core::hash::{Hash, Hasher};
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pub use self::inner::{Instant, SystemTime, UNIX_EPOCH};
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use crate::convert::TryInto;
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const NSEC_PER_SEC: u64 = 1_000_000_000;
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#[derive(Copy, Clone)]
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struct Timespec {
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t: libc::timespec,
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}
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impl Timespec {
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const fn zero() -> Timespec {
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Timespec { t: libc::timespec { tv_sec: 0, tv_nsec: 0 } }
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}
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fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
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if self >= other {
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Ok(if self.t.tv_nsec >= other.t.tv_nsec {
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Duration::new(
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(self.t.tv_sec - other.t.tv_sec) as u64,
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(self.t.tv_nsec - other.t.tv_nsec) as u32,
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)
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} else {
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Duration::new(
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(self.t.tv_sec - 1 - other.t.tv_sec) as u64,
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self.t.tv_nsec as u32 + (NSEC_PER_SEC as u32) - other.t.tv_nsec as u32,
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)
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})
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} else {
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match other.sub_timespec(self) {
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Ok(d) => Err(d),
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Err(d) => Ok(d),
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}
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}
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}
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fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
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let mut secs = other
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.as_secs()
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.try_into() // <- target type would be `libc::time_t`
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.ok()
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.and_then(|secs| self.t.tv_sec.checked_add(secs))?;
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// Nano calculations can't overflow because nanos are <1B which fit
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// in a u32.
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let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
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if nsec >= NSEC_PER_SEC as u32 {
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nsec -= NSEC_PER_SEC as u32;
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secs = secs.checked_add(1)?;
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}
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Some(Timespec { t: libc::timespec { tv_sec: secs, tv_nsec: nsec as _ } })
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}
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fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
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let mut secs = other
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.as_secs()
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.try_into() // <- target type would be `libc::time_t`
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.ok()
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.and_then(|secs| self.t.tv_sec.checked_sub(secs))?;
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// Similar to above, nanos can't overflow.
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let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;
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if nsec < 0 {
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nsec += NSEC_PER_SEC as i32;
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secs = secs.checked_sub(1)?;
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}
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Some(Timespec { t: libc::timespec { tv_sec: secs, tv_nsec: nsec as _ } })
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}
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}
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impl PartialEq for Timespec {
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fn eq(&self, other: &Timespec) -> bool {
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self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
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}
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}
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impl Eq for Timespec {}
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impl PartialOrd for Timespec {
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fn partial_cmp(&self, other: &Timespec) -> Option<Ordering> {
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Some(self.cmp(other))
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}
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}
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impl Ord for Timespec {
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fn cmp(&self, other: &Timespec) -> Ordering {
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let me = (self.t.tv_sec, self.t.tv_nsec);
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let other = (other.t.tv_sec, other.t.tv_nsec);
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me.cmp(&other)
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}
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}
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impl Hash for Timespec {
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fn hash<H: Hasher>(&self, state: &mut H) {
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self.t.tv_sec.hash(state);
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self.t.tv_nsec.hash(state);
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}
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}
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#[cfg(any(target_os = "macos", target_os = "ios"))]
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mod inner {
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use crate::fmt;
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use crate::mem;
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use crate::sync::atomic::{AtomicUsize, Ordering::SeqCst};
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use crate::sys::cvt;
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use crate::sys_common::mul_div_u64;
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use crate::time::Duration;
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use super::Timespec;
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use super::NSEC_PER_SEC;
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
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pub struct Instant {
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t: u64,
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}
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct SystemTime {
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t: Timespec,
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}
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pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
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#[repr(C)]
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#[derive(Copy, Clone)]
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struct mach_timebase_info {
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numer: u32,
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denom: u32,
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}
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type mach_timebase_info_t = *mut mach_timebase_info;
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type kern_return_t = libc::c_int;
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impl Instant {
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pub fn now() -> Instant {
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extern "C" {
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fn mach_absolute_time() -> u64;
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}
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Instant { t: unsafe { mach_absolute_time() } }
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}
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pub const fn zero() -> Instant {
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Instant { t: 0 }
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}
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pub fn actually_monotonic() -> bool {
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true
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}
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pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
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let diff = self.t.checked_sub(other.t)?;
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let info = info();
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let nanos = mul_div_u64(diff, info.numer as u64, info.denom as u64);
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Some(Duration::new(nanos / NSEC_PER_SEC, (nanos % NSEC_PER_SEC) as u32))
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}
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pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
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Some(Instant { t: self.t.checked_add(checked_dur2intervals(other)?)? })
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}
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pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
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Some(Instant { t: self.t.checked_sub(checked_dur2intervals(other)?)? })
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}
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}
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impl SystemTime {
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pub fn now() -> SystemTime {
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use crate::ptr;
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let mut s = libc::timeval { tv_sec: 0, tv_usec: 0 };
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cvt(unsafe { libc::gettimeofday(&mut s, ptr::null_mut()) }).unwrap();
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return SystemTime::from(s);
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}
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pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
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self.t.sub_timespec(&other.t)
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}
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pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
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Some(SystemTime { t: self.t.checked_add_duration(other)? })
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}
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pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
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Some(SystemTime { t: self.t.checked_sub_duration(other)? })
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}
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}
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impl From<libc::timeval> for SystemTime {
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fn from(t: libc::timeval) -> SystemTime {
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SystemTime::from(libc::timespec {
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tv_sec: t.tv_sec,
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tv_nsec: (t.tv_usec * 1000) as libc::c_long,
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})
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}
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}
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impl From<libc::timespec> for SystemTime {
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fn from(t: libc::timespec) -> SystemTime {
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SystemTime { t: Timespec { t } }
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}
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}
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impl fmt::Debug for SystemTime {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("SystemTime")
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.field("tv_sec", &self.t.t.tv_sec)
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.field("tv_nsec", &self.t.t.tv_nsec)
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.finish()
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}
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}
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fn checked_dur2intervals(dur: &Duration) -> Option<u64> {
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let nanos =
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dur.as_secs().checked_mul(NSEC_PER_SEC)?.checked_add(dur.subsec_nanos() as u64)?;
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let info = info();
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Some(mul_div_u64(nanos, info.denom as u64, info.numer as u64))
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}
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fn info() -> mach_timebase_info {
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static mut INFO: mach_timebase_info = mach_timebase_info { numer: 0, denom: 0 };
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static STATE: AtomicUsize = AtomicUsize::new(0);
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unsafe {
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// If a previous thread has filled in this global state, use that.
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if STATE.load(SeqCst) == 2 {
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return INFO;
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}
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// ... otherwise learn for ourselves ...
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let mut info = mem::zeroed();
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extern "C" {
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fn mach_timebase_info(info: mach_timebase_info_t) -> kern_return_t;
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}
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mach_timebase_info(&mut info);
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// ... and attempt to be the one thread that stores it globally for
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// all other threads
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if STATE.compare_exchange(0, 1, SeqCst, SeqCst).is_ok() {
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INFO = info;
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STATE.store(2, SeqCst);
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}
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return info;
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}
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}
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}
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#[cfg(not(any(target_os = "macos", target_os = "ios")))]
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mod inner {
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use crate::fmt;
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use crate::sys::cvt;
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use crate::time::Duration;
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use super::Timespec;
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct Instant {
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t: Timespec,
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}
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
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pub struct SystemTime {
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t: Timespec,
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}
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pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
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impl Instant {
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pub fn now() -> Instant {
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Instant { t: now(libc::CLOCK_MONOTONIC) }
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}
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pub const fn zero() -> Instant {
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Instant { t: Timespec::zero() }
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}
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pub fn actually_monotonic() -> bool {
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(cfg!(target_os = "linux") && cfg!(target_arch = "x86_64"))
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|| (cfg!(target_os = "linux") && cfg!(target_arch = "x86"))
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|| cfg!(target_os = "fuchsia")
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}
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pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
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self.t.sub_timespec(&other.t).ok()
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}
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pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
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Some(Instant { t: self.t.checked_add_duration(other)? })
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}
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pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
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Some(Instant { t: self.t.checked_sub_duration(other)? })
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}
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}
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impl fmt::Debug for Instant {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("Instant")
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.field("tv_sec", &self.t.t.tv_sec)
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.field("tv_nsec", &self.t.t.tv_nsec)
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.finish()
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}
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}
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impl SystemTime {
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pub fn now() -> SystemTime {
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SystemTime { t: now(libc::CLOCK_REALTIME) }
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}
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pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
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self.t.sub_timespec(&other.t)
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}
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pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
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Some(SystemTime { t: self.t.checked_add_duration(other)? })
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}
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pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
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Some(SystemTime { t: self.t.checked_sub_duration(other)? })
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}
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}
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impl From<libc::timespec> for SystemTime {
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fn from(t: libc::timespec) -> SystemTime {
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SystemTime { t: Timespec { t } }
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}
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}
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impl fmt::Debug for SystemTime {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("SystemTime")
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.field("tv_sec", &self.t.t.tv_sec)
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.field("tv_nsec", &self.t.t.tv_nsec)
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.finish()
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}
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}
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#[cfg(not(target_os = "dragonfly"))]
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pub type clock_t = libc::c_int;
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#[cfg(target_os = "dragonfly")]
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pub type clock_t = libc::c_ulong;
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fn now(clock: clock_t) -> Timespec {
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let mut t = Timespec { t: libc::timespec { tv_sec: 0, tv_nsec: 0 } };
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cvt(unsafe { libc::clock_gettime(clock, &mut t.t) }).unwrap();
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t
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}
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}
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