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fix(ci): stabilize allocation probe on macOS MSRV #71

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Merged
jcwal1516 merged 1 commit into from
Aug 4, 2026
Merged

fix(ci): stabilize allocation probe on macOS MSRV #71

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10 changes: 6 additions & 4 deletions crates/j2k-alloc-probe/tests/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,8 +23,8 @@ const KIB: u64 = 1024;
static PROBE_POOL: OnceLock<ThreadPool> = OnceLock::new();

fn main() {
probe_pool().broadcast(|_| {});

// Keep the Rayon pool uninitialized while exact allocator self-tests run.
// The process-wide meter intentionally records unrelated worker activity.
let cases: &[(&str, fn())] = &[
(
"harness_counts_allocation_and_deallocation",
Expand Down Expand Up @@ -89,15 +89,17 @@ fn main() {
}

fn harness_counts_allocation_and_deallocation() {
let (allocation, retained) = measure(|| black_box(Box::new([0_u8; 4096])));
// Allocate the backing storage directly. In debug builds, constructing a
// large array inside `Box::new` can use an additional temporary allocation.
let (allocation, retained) = measure(|| black_box(Box::<[u8]>::new_uninit_slice(4096)));
assert_eq!(retained.allocations, 1);
assert_eq!(retained.reallocations, 0);
assert_eq!(retained.deallocations, 0);
assert!(retained.requested_bytes >= 4096);
drop(allocation);

let ((), released) = measure(|| {
drop(black_box(Box::new([0_u8; 4096])));
drop(black_box(Box::<[u8]>::new_uninit_slice(4096)));
});
assert_eq!(released.allocations, 1);
assert_eq!(released.reallocations, 0);
Expand Down