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
time-rs/time@cc367ed
which predated the introduction of `clock_gettime` support in macOS
10.12 Sierra which became the minimum supported version in
58bbca9.

Note that this change was made for aarch64 in
5008a31 which predated 10.12 becoming
the minimum supported version. The discussion took place in
#91417 and in particular
#91417 (comment)
and
#91417 (comment)
are relevant. It's not clear from reading that thread why
CLOCK_UPTIME_RAW was used rather than CLOCK_MONOTONIC. The latter is now
used.

Author: tamird

library/std/src/sys/unix/time.rs

@@ -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
@@ -249,162 +247,34 @@ impl From<__timespec64> for Timespec {
         Timespec::new(t.tv_sec, t.tv_nsec.into())
     }
 }
+#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct Instant {
+    t: 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;
-
-    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))
+impl Instant {
+    pub fn now() -> Instant {
+        Instant { t: Timespec::now(libc::CLOCK_MONOTONIC) }
     }
 
-    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.
-        //
-        // 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
+    pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
+        self.t.sub_timespec(&other.t).ok()
     }
 
-    #[inline]
-    fn info_to_bits(info: mach_timebase_info) -> u64 {
-        ((info.denom as u64) << 32) | (info.numer as u64)
+    pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
+        Some(Instant { t: self.t.checked_add_duration(other)? })
     }
 
-    #[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_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()
     }
 }

library/std/src/time.rs

@@ -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.
 ///