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time: use clock_gettime on macos 

Replace `mach_{absolute_time,timebase_info}` with
`clock_gettime(CLOCK_REALTIME)` on:

```
all(target_os = "macos", not(target_arch = "aarch64")),
    target_os = "ios",
    target_os = "watchos",
    target_os = "tvos"
))]
```

`mach_{absolute_time,timebase_info}` were first used in
cc367edd95
which predated the introduction of `clock_gettime` support in macOS
10.12 Sierra which became the minimum supported version in
58bbca958d.

Note that this change was made for aarch64 in
5008a317ce which predated 10.12 becoming
the minimum supported version. The discussion took place in
https://github.com/rust-lang/rust/issues/91417 and in particular
https://github.com/rust-lang/rust/issues/91417#issuecomment-992151582
and
https://github.com/rust-lang/rust/issues/91417#issuecomment-1033048064
are relevant.
This commit is contained in:
Tamir Duberstein 2023-09-28 17:34:41 -04:00
parent b21eb4f046
commit bc300102d4
No known key found for this signature in database
2 changed files with 46 additions and 151 deletions
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194
library/std/src/sys/unix/time.rs
View File

@ -1,8 +1,6 @@
use crate::fmt;
use crate::time::Duration;
pub use self::inner::Instant;
const NSEC_PER_SEC: u64 = 1_000_000_000;
pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
#[allow(dead_code)] // Used for pthread condvar timeouts
@ -250,161 +248,59 @@ impl From<__timespec64> for Timespec {
}
}
#[cfg(any(
all(target_os = "macos", not(target_arch = "aarch64")),
target_os = "ios",
target_os = "watchos",
target_os = "tvos"
))]
mod inner {
use crate::sync::atomic::{AtomicU64, Ordering};
use crate::sys_common::mul_div_u64;
use crate::time::Duration;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Instant {
t: Timespec,
}
use super::{SystemTime, Timespec, NSEC_PER_SEC};
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct Instant {
t: u64,
}
#[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 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 From<libc::timeval> for Timespec {
fn from(t: libc::timeval) -> Timespec {
Timespec::new(t.tv_sec as i64, 1000 * t.tv_usec as i64)
}
}
impl From<libc::timeval> for SystemTime {
fn from(t: libc::timeval) -> SystemTime {
SystemTime { t: Timespec::from(t) }
}
}
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 {
// INFO_BITS conceptually is an `Option<mach_timebase_info>`. We can do
// this in 64 bits because we know 0 is never a valid value for the
// `denom` field.
impl Instant {
pub fn now() -> Instant {
// https://www.manpagez.com/man/3/clock_gettime/
//
// Encoding this as a single `AtomicU64` allows us to use `Relaxed`
// operations, as we are only interested in the effects on a single
// memory location.
static INFO_BITS: AtomicU64 = AtomicU64::new(0);
// If a previous thread has initialized `INFO_BITS`, use it.
let info_bits = INFO_BITS.load(Ordering::Relaxed);
if info_bits != 0 {
return info_from_bits(info_bits);
}
// ... otherwise learn for ourselves ...
extern "C" {
fn mach_timebase_info(info: mach_timebase_info_t) -> kern_return_t;
}
let mut info = info_from_bits(0);
unsafe {
mach_timebase_info(&mut info);
}
INFO_BITS.store(info_to_bits(info), Ordering::Relaxed);
info
// CLOCK_UPTIME_RAW clock that increments monotonically, in the same man-
// ner as CLOCK_MONOTONIC_RAW, but that does not incre-
// ment while the system is asleep. The returned value
// is identical to the result of mach_absolute_time()
// after the appropriate mach_timebase conversion is
// applied.
//
// Instant on macos was historically implemented using mach_absolute_time;
// we preserve this value domain out of an abundance of caution.
#[cfg(any(
target_os = "macos",
target_os = "ios",
target_os = "watchos",
target_os = "tvos"
))]
const clock_id: libc::clockid_t = libc::CLOCK_UPTIME_RAW;
#[cfg(not(any(
target_os = "macos",
target_os = "ios",
target_os = "watchos",
target_os = "tvos"
)))]
const clock_id: libc::clockid_t = libc::CLOCK_MONOTONIC;
Instant { t: Timespec::now(clock_id) }
}
#[inline]
fn info_to_bits(info: mach_timebase_info) -> u64 {
((info.denom as u64) << 32) | (info.numer as u64)
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
self.t.sub_timespec(&other.t).ok()
}
#[inline]
fn info_from_bits(bits: u64) -> mach_timebase_info {
mach_timebase_info { numer: bits as u32, denom: (bits >> 32) as u32 }
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)? })
}
}
#[cfg(not(any(
all(target_os = "macos", not(target_arch = "aarch64")),
target_os = "ios",
target_os = "watchos",
target_os = "tvos"
)))]
mod inner {
use crate::fmt;
use crate::time::Duration;
use super::Timespec;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Instant {
t: Timespec,
}
impl Instant {
pub fn now() -> Instant {
#[cfg(target_os = "macos")]
const clock_id: libc::clockid_t = libc::CLOCK_UPTIME_RAW;
#[cfg(not(target_os = "macos"))]
const clock_id: libc::clockid_t = libc::CLOCK_MONOTONIC;
Instant { t: Timespec::now(clock_id) }
}
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.tv_sec)
.field("tv_nsec", &self.t.tv_nsec.0)
.finish()
}
impl fmt::Debug for Instant {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Instant")
.field("tv_sec", &self.t.tv_sec)
.field("tv_nsec", &self.t.tv_nsec.0)
.finish()
}
}

3
library/std/src/time.rs
View File

@ -109,7 +109,7 @@ pub use core::time::TryFromFloatSecsError;
/// |-----------|----------------------------------------------------------------------|
/// | SGX | [`insecure_time` usercall]. More information on [timekeeping in SGX] |
/// | UNIX | [clock_gettime (Monotonic Clock)] |
/// | Darwin | [mach_absolute_time] |
/// | Darwin | [clock_gettime (Monotonic Clock)] |
/// | VXWorks | [clock_gettime (Monotonic Clock)] |
/// | SOLID | `get_tim` |
/// | WASI | [__wasi_clock_time_get (Monotonic Clock)] |
@ -121,7 +121,6 @@ pub use core::time::TryFromFloatSecsError;
/// [timekeeping in SGX]: https://edp.fortanix.com/docs/concepts/rust-std/#codestdtimecode
/// [__wasi_clock_time_get (Monotonic Clock)]: https://github.com/WebAssembly/WASI/blob/main/legacy/preview1/docs.md#clock_time_get
/// [clock_gettime (Monotonic Clock)]: https://linux.die.net/man/3/clock_gettime
/// [mach_absolute_time]: https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/KernelProgramming/services/services.html
///
/// **Disclaimer:** These system calls might change over time.
///