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Enhance rand to support macos #159

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17 changes: 14 additions & 3 deletions src/rand.rs
Original file line number Diff line number Diff line change
Expand Up @@ -24,17 +24,28 @@ pub fn timestamp_cycles() -> u64 {

#[cfg(not(target_arch = "x86_64"))]
{
use std::sync::atomic::{AtomicU64, Ordering};
static TIMESTAMP: AtomicU64 = AtomicU64::new(0);
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Does this need to be static?

const MONOTONIC_CLOCK_MULTPIPLIER: u64 = 1_000_000_000;

let mut ts = libc::timespec {
tv_sec: 0,
tv_nsec: 0,
};

unsafe {
libc::clock_gettime(libc::CLOCK_MONOTONIC, &mut ts);
// clock_gettime(libc::CLOCK_MONOTONIC) may return the same value, so retry...
loop {
unsafe { libc::clock_gettime(libc::CLOCK_MONOTONIC, &mut ts) };
let curr = (ts.tv_sec as u64) * MONOTONIC_CLOCK_MULTPIPLIER + (ts.tv_nsec as u64);
let prev = TIMESTAMP.load(Ordering::Acquire);
if prev < curr
&& TIMESTAMP
.compare_exchange(prev, curr, Ordering::AcqRel, Ordering::Relaxed)
.is_ok()
{
return curr;
}
}
(ts.tv_sec as u64) * MONOTONIC_CLOCK_MULTPIPLIER + (ts.tv_nsec as u64)
}
}

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3 changes: 3 additions & 0 deletions src/unix/tempdir.rs
Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,7 @@ mod tests {
let path = t.as_path();
assert!(path.exists());
assert!(path.is_dir());
#[cfg(not(target_os = "macos"))]
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Can we instead check that the path is in the equivalent temp_dir for mac os? Otherwise this test is not very useful.

assert!(path.starts_with(temp_dir()));
}

Expand Down Expand Up @@ -185,12 +186,14 @@ mod tests {
let path = t.as_path();
assert!(path.exists());
assert!(path.is_dir());
#[cfg(not(target_os = "macos"))]
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Can we add an equivalent check here instead?

assert!(path.starts_with("/tmp/"));

let t = TempDir::new_in(Path::new("/tmp")).unwrap();
let path = t.as_path();
assert!(path.exists());
assert!(path.is_dir());
#[cfg(not(target_os = "macos"))]
assert!(path.starts_with("/tmp"));
}

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