GeezerVison is showing github.com — Impl Drop for PyAtomicRef by youknowone · Pull Request #5970 · RustPython/RustPython
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youknowone
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Jul 14, 2025
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@qingshi163 basically everything is PyObjectRef. So this will be fine, right?
Summary by CodeRabbit
- Bug Fixes
- Improved memory management to ensure that Python object references are safely released when no longer needed, reducing the risk of resource leaks.
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coderabbitai
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Jul 14, 2025
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Caution
Review failed
The pull request is closed.
Walkthrough
A Drop trait implementation was introduced for the generic struct PyAtomicRef<T>. The new drop method ensures that when a PyAtomicRef instance is dropped, its internal atomic pointer is safely swapped out and the referenced Python object is properly released.
Changes
| File(s) |
Change Summary |
| vm/src/object/ext.rs |
Added Drop trait implementation for PyAtomicRef<T>. |
Poem
When PyAtomicRef hops away,
It drops its pointer, clears the way.
With a gentle swap and careful touch,
Python objects thank it much!
In memory meadows, clean and bright,
Rusty rabbits sleep at night. 🐇✨
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Actionable comments posted: 0
🧹 Nitpick comments (1)
vm/src/object/ext.rs (1)
248-259: Consider using stronger memory ordering for consistency and safety.
The Drop implementation looks correct for preventing memory leaks, but there are a couple of considerations:
-
Memory ordering: You're using Ordering::Relaxed for the swap operation, but all other swap methods in this file use Ordering::AcqRel (lines 319, 360, 405, 451). For consistency and to ensure proper synchronization in multi-threaded scenarios, consider using AcqRel ordering.
-
Import consistency: Use the imported null_mut from line 20 instead of std::ptr::null_mut().
Apply this diff to address the concerns:
- let ptr = self.inner.swap(std::ptr::null_mut(), Ordering::Relaxed);
+ let ptr = self.inner.swap(null_mut(), Ordering::AcqRel);
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#5968 is calling Drop, and it looks fine!
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qingshi163
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