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refactor: make spawn state and handle types explicit - #36
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| Check name | Status | Explanation |
|---|---|---|
| Description check |  |
The description includes the required Summary, Validation, and Checklist sections. It documents the change, test commands and environments, ownership and cleanup contracts, API impact, and checklist c… |
| Title check | |
The title uses the Conventional Commits format and clearly describes the refactor that makes spawn state and handle types explicit. It has no unnecessary prefix or breaking-change marker. |
| Linked Issues check | |
The changes satisfy the coding requirements in issue #35. src/child.rs and src/transaction.rs use direct ownership instead of the prior Option state and remove the related lint exceptions. `src/… |
| Out of Scope Changes check | |
The changes remain within issue #35. The typed resource wrappers, ownership refactor, creation helpers, gate implementation and tests, dependency bans, ADR updates, lint-registry updates, mutation-ski… |
| Behavior Verification Evidence | |
The PR changes observable spawn lifecycle behavior and handle typing. The description provides relevant verification with commands and results: cargo xtask test passed the unit, integration, xtask, … |
| Public Interface Compatibility | |
The only supported public-interface break is the removal of impl Drop for windows_spawn::SuspendedChild, reflected by its absence from public-api/windows-spawn.txt. The PR description explicitly d… |
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Actionable comments posted: 4
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Inline comments:
Review comments at @docs/adr/0016-spawn-state-is-explicit-and-typed.md:
- Line 37: Update the exception statement in the ADR to specify that
`clippy::expect_used` and `too_many_lines` exceptions were removed from
`src/child.rs` and `src/transaction.rs`, without claiming they were removed from
the entire registry; preserve the remaining registrations in
`xtask/src/gates.rs`.
Review comments at @xtask/src/gates.rs:
- Around line 455-459: Update in_error_source to exempt dyn Error only when it
appears in the return position of Error::source within an Error trait
implementation. Do not exempt matching parameter types or unrelated methods
named source.
- Around line 513-518: Update item_end so a guarded let statement is scanned
through its terminating semicolon rather than ending at the initializer’s
closing brace; keep the full statement under the guard. Use the surrounding
depth and attribute handling to distinguish this case without changing other
item boundaries.
- Around line 493-497: Update the `cfg` predicate check using `members.split` to
ignore a single empty final member caused by a trailing comma, while continuing
to reject empty interior members and unsupported identifiers. Update the
corresponding rejection assertion to expect trailing-comma test-only predicates
to be accepted.
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📒 Files selected for processing (15)
.rust-mutants.tomldeny.tomldocs/adr/0007-spawn-transaction.mddocs/adr/0013-repository-laws-are-enforced-mechanically.mddocs/adr/0016-spawn-state-is-explicit-and-typed.mdpublic-api/windows-spawn.txtsrc/child.rssrc/command.rssrc/failure_tests.rssrc/handles.rssrc/lib.rssrc/resource.rssrc/sys.rssrc/transaction.rsxtask/src/gates.rs
💤 Files with no reviewable changes (1)
- public-api/windows-spawn.txt
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src/failure_tests.rssrc/resource.rssrc/lib.rssrc/handles.rssrc/command.rssrc/child.rsxtask/src/gates.rssrc/transaction.rssrc/sys.rs
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docs/adr/0007-spawn-transaction.mddeny.tomldocs/adr/0013-repository-laws-are-enforced-mechanically.mdsrc/failure_tests.rsdocs/adr/0016-spawn-state-is-explicit-and-typed.mdsrc/resource.rssrc/lib.rssrc/handles.rssrc/command.rssrc/child.rsxtask/src/gates.rssrc/transaction.rssrc/sys.rs
🔇 Additional comments (12)
src/resource.rs (1)
1-220: LGTM!src/lib.rs (1)
29-30: LGTM!src/sys.rs (1)
101-117: LGTM!src/handles.rs (1)
155-163: LGTM!src/command.rs (1)
438-439: LGTM!src/failure_tests.rs (1)
63-71: LGTM!src/child.rs (1)
497-512: LGTM!src/transaction.rs (1)
65-119: LGTM!.rust-mutants.toml (1)
97-113: LGTM!docs/adr/0007-spawn-transaction.md (1)
3-3: LGTM!deny.toml (1)
37-53: LGTM!docs/adr/0013-repository-laws-are-enforced-mechanically.md (1)
3-3: LGTM!
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A suspended child and an uncommitted transaction kept their process in an `Option` that `resume` and the commits took out with an `expect`. The process handle now terminates a process that never ran when it drops, so each of them owns its parts directly. A running spawn commits by resuming a `SuspendedChild`, so both commits share one resume. The creation splits into functions for the standard I/O, the private Job, the Job list, the working directory, and the attribute list. Each handle names its object type, and each `sys` wrapper takes the type its call needs. Handle values carry the table they belong to, so a value of the creator's table can't join the handles that an alternate parent's child inherits. `AttributeList` borrows the values its attributes point to, so the compiler keeps them alive until `DeleteProcThreadAttributeList` runs. The lint registry drops the `expect_used` and `too_many_lines` exceptions of `src/child.rs` and `src/transaction.rs`. The public API loses only the `Drop` impl of `SuspendedChild`, whose process handle now ends the process. Refs #35
`cargo xtask gates` refuses a trait object outside the signature of `Error::source`, in every file. In library code it also refuses shared ownership, cell types, locks, atomics, `static` items, one-time initialization, `thread_local`, runtime reflection, and hash-based maps and sets. Items under `cfg(test)` or `cfg(kani)`, and `src/failure_tests.rs`, keep their thread-local state, counters, and downcasts. Scanner tests cover each rule with refused and accepted code. `deny.toml` bans the crates that PR #14 banned, which erase errors, erase serialization or futures, register items at run time, or keep implicit global state. ADR 0016 records these rules and the explicit spawn state, and credits the ADR 0009 of #14. Refs #35
Splitting the creation moved the `?` that only an interior NUL in the working directory reaches, which validation rejects first. The mutation skip now names its new line, so the configuration skips four places again, as it did before the split. Refs #35
The trait-object rule exempted any `dyn Error` in the signature of a function named `source`, parameters included. It now exempts only what `source` returns in an implementation of `Error`. A guarded `let` statement whose initializer ends with a brace, such as a struct literal followed by a method call, now stays guarded through its `;`. A closing brace ends the guarded item only when no `else`, method call, `?`, `;`, or `,` continues it. A test-only `cfg` that ends its list with a comma, which Rust accepts, now counts as test-only, while an empty member inside the list still doesn't. ADR 0016 states the narrowed exception, and that the registry lost its exceptions for `src/child.rs` and `src/transaction.rs`, not every exception. Refs #35
A Windows Server 2022 run showed the Job still listing the child for a moment after the wait for it returned. The comment on `job_process_ids` claimed that a process leaves the list before its handle signals. It now states what holds: an empty list means that no process of the Job still runs. Refs #35
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@coderabbitai Commit 004adb9 addresses each of the four review threads, and the head 0b29984 carries it:
The Linked Issues check failed because #35 said that the public API doesn't change. |
🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
git rev-parse HEAD
git show --stat --oneline 004adb9
ast-grep outline xtask/src/gates.rs --items all --match 'in_error_source|item_end|is_test_only_cfg|test' --view expanded
cat -n docs/adr/0016-spawn-state-is-explicit-and-typed.md
gh issue view 35 --repo P4suta/windows-spawn --json title,body,url,updatedAt
gh pr view 36 --repo P4suta/windows-spawn --json headRefOid,statusCheckRollup
gh api graphql -f query='query { repository(owner:"P4suta",name:"windows-spawn") { pullRequest(number:36) { reviewThreads(first:100) { nodes { id isResolved path line comments(first:10) { nodes { id author { login } body url } } } pageInfo { hasNextPage endCursor } } } } }'Length of output: 29373 🏁 Script executed: #!/bin/bash
set -euo pipefail
git merge-base --is-ancestor 004adb9 HEAD && echo "004adb9 is an ancestor of HEAD"
sed -n '390,650p' xtask/src/gates.rs | cat -n
sed -n '1060,1185p' xtask/src/gates.rs | cat -n
gh api repos/P4suta/windows-spawn/issues/36/comments --paginate --jq '.[] | select(.user.login == "coderabbitai" or .user.login == "coderabbitai[bot]") | {id,body,html_url}'
ast-grep outline src/child.rs --items all --match 'ProcessHandle|SuspendedChild|drop|resume' --view expanded
git diff 004adb9^ 004adb9 -- xtask/src/gates.rsLength of output: 49161 🏁 Script executed: #!/bin/bash
set -euo pipefail
sed -n '150,205p' src/child.rs
sed -n '460,515p' src/child.rs
for thread in PRRT_kwDOTq3apc6r5IF5 PRRT_kwDOTq3apc6r5IF8 PRRT_kwDOTq3apc6r5IGE; do
gh api graphql -f threadId="$thread" -f query='mutation($threadId:ID!) { resolveReviewThread(input:{threadId:$threadId}) { thread { id isResolved } } }'
done
gh api graphql -f query='query { repository(owner:"P4suta",name:"windows-spawn") { pullRequest(number:36) { reviewThreads(first:100) { nodes { id isResolved } } } } }'Length of output: 4694
Three fixes are complete:
The guarded- #[cfg(test)]
let value = { 1 } + Arc::strong_count(&arc);
Thread resolution failed. GitHub rejected the first resolution request with The updated All reported CI checks passed. I inspected the code and regression tests; I did not run repository code. Thanks for clarifying the compatibility requirement. ✏️ Learnings added
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A guarded `let` whose initializer closes a block before an operator, such as `{ 1 } + Arc::strong_count(&arc)`, still ended at the brace.
A `let` statement and a `static`, `const`, `use`, or `type` item now end only at their `;`.
The scan finds the item's keyword past any further attribute and the visibility.
A `const fn` still ends with its body, and the scanner tests cover both kinds.
Refs #35
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Summary
Closes #35.
This PR stacks on #33.
Explicit spawn state
Until the main thread runs, dropping the handle terminates the process.
A transaction, a
SuspendedChild, and aChildown their parts directly, soresumeand the commits need noOptionand noexpect.A running spawn commits by resuming a
SuspendedChild, so both commits share one resume.Each wrapper in
systakes the type its Win32 call needs.AttributeList<'a>borrows the values its attributes point to.The compiler now keeps them alive until
DeleteProcThreadAttributeListruns, which aSAFETYcomment only asked for before.The lint registry loses its
expect_usedandtoo_many_linesexceptions forsrc/child.rsandsrc/transaction.rs.The public API loses only the
Dropimpl ofSuspendedChild, and dropping one still terminates its process through its process handle.The gates
cargo xtask gatesrefuses a trait object in every file, except whatsourcereturns in an implementation ofError.staticitems, one-time initialization,thread_local, runtime reflection, and hash-based maps and sets.Items, statements, and fields under
cfg(test)orcfg(kani), andsrc/failure_tests.rs, keep their thread-local state, counters, and downcasts.deny.tomlbans the crates that refactor!: enforce spawn invariants mechanically #14 banned, which erase errors, erase serialization or futures, register items at run time, or keep implicit global state.Validation
On Windows 11, x64:
cargo xtask testpassed 73 unit tests, 36 integration tests, 36 xtask tests, and 16 doctests.A new unit test shows that a dropped handle ends a process that never ran, and leaves a started one running.
cargo xtask verifierran 111 test processes underappverif.exe, each clean but the 3 that misuse a handle on purpose and stopped.rust-mutants why-skippedskips four configured places, as it does on feat!: design the 0.2 API and prove the spawn decisions #33, once the skips name the lines the split moved.On macOS, Apple silicon:
cargo xtask gates, and the xtask tests passed, including the new scanner tests.cargo xtask public-apimatched the updated snapshot.reuse lint,typos, andcargo deny check bans licenses sourcespassed.The owner has paused CodeRabbit, so its review of this PR waits for the owner to resume it.
Checklist
Dropimpl ofSuspendedChild.Why
Spawn transactions, suspended children, and Win32 handles did not express ownership or handle type in their types.
This allowed invalid states and handle/table mismatches that relied on runtime checks.
Changes
cargo xtask gateschecks for trait objects and disallowed library patterns, and add dependency bans.SuspendedChild’sDropimplementation; dropping it still terminates an unstarted process through the process handle.Validation
The PR reports 73 unit tests, 36 integration tests, 36 xtask tests, and 16 doctests passing on Windows 11 x64.
The PR reports that
cargo xtask verifierran 111 test processes, including three intentional handle-misuse cases that stopped.The PR reports passing formatting, gates, xtask tests, Clippy, Rust 1.75 checks, rustdoc with warnings denied, the public API snapshot, lint checks, and dependency checks on macOS Apple silicon.