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feat(rwlock_atomic): add new lints for using RwLock with atomic types #16180

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feat(rwlock_atomic): add new lints for using RwLock with atomic types #16180

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@Tunglies Tunglies commented Dec 2, 2025

changelog: [rwlock_atomic]: new lint
changelog: [rwlock_integer]: new lint

@rustbot rustbot added needs-fcp S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Dec 2, 2025
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r? @blyxyas

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Tunglies commented Dec 2, 2025

Hey @blyxyas, would you be interested in reviewing?

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blyxyas commented Dec 2, 2025

Yes @Tunglies I'll review this one, could you give us some more information in the pull request's description? Is this fixing any existing issues? In general, more context on why this pull request is needed would be very appreciated.

Thanks!

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Tunglies commented Dec 2, 2025 •
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Yes @Tunglies I'll review this one, could you give us some more information in the pull request's description? Is this fixing any existing issues? In general, more context on why this pull request is needed would be very appreciated.

Thanks!

I found Mutex rulesclippy::mutex_atomic and clippy::mutex_integer rules, use them for my comunnity's project clash-verge-rev to helps reduce Arc and lock performance cost, most are Arc<Mutex/Rwlock<bool>>. I tried write some basic branchmark for Arc<Mutex/RwLock<T>> and Atomic<T> with std lib, found that Arc<RwLock<T>> is even slower than Arc<Mutex<T>>. While continue performance development, if has Rwlock rule for this usage same as clippy::mutex_atomic and clippy::mutex_integer would be more convenience.

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Seems that the lint logic is really similar to mutex_atomic, could you merge these?

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action from the author. (Use `@rustbot ready` to update this status) and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Dec 4, 2025
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rustbot commented Dec 4, 2025

Reminder, once the PR becomes ready for a review, use @rustbot ready.

gauravagerwala added a commit to gauravagerwala/rust-clippy that referenced this pull request Dec 7, 2025
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Update design for PR rust-lang#16180: feat(rwlock_atomic): add new li…
e9fb6e7 
…nts for using RwLock with atomic types
@Tunglies Tunglies marked this pull request as draft December 9, 2025 00:06
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Tunglies commented Dec 9, 2025

Hey @blyxyas I have merged the lints and renamed the lint file and its uibless counterpart. Looking forward to your feedback :3

@Tunglies Tunglies marked this pull request as ready for review December 9, 2025 01:37
@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Dec 9, 2025
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Tunglies commented Dec 9, 2025

@rustbot ready

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Tunglies commented Dec 18, 2025

Hey @blyxyas, wondering if you still have interested with this? :)

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blyxyas commented Dec 22, 2025

hi @Tunglies, I'm still interested in this pull request, don't worry (unless you have some time constraints), it's just that sadly FOSS is no longer my full-time job, so having time to review is a complex task. Don't worry, I'll still review it ( ^..^)ﾉ

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Tunglies commented Dec 25, 2025

Not really, just doubt if I was doing useful contributing at time. Feel free to reviewing :0

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feat(rwlock_atomic): add new lints for using RwLock with atomic types
af20a22 
changelog: [`rwlock_atomic`]: new lint
changelog: [`rwlock_integer`]: new lint
@Tunglies
Implement lints for using RwLock and Mutex where atomic types cou…
742d17f 
…ld be used instead

- Added new lints: `RWLOCK_ATOMIC`, `RWLOCK_INTEGER`, `MUTEX_ATOMIC`, and `MUTEX_INTEGER` to check for inappropriate usage of `RwLock` and `Mutex` with atomic types.
- Created a new lint pass `SyncGuard` to handle the linting logic for these cases.
- Updated tests to cover various scenarios where `RwLock` and `Mutex` are used with atomic types, ensuring that the lints trigger correctly.
- Removed outdated test files and added new tests to validate the behavior of the new lints.
- Rename rwlock_atomic.rs to rwlock_mutex_atomic.rs
@Tunglies
refactor: simplify diagnostic message for Mutex and RwLock lints
a90f3e0
@Tunglies Tunglies force-pushed the feat-lint-rwlock-atomic branch from 8b30fcc to a90f3e0 Compare December 25, 2025 11:58
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rustbot commented Dec 25, 2025

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

@Tunglies Tunglies marked this pull request as draft December 25, 2025 11:59
@rustbot rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Dec 25, 2025
@Tunglies Tunglies marked this pull request as ready for review December 25, 2025 12:28
@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Dec 25, 2025
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