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Impl Drop for PyAtomicRef#5970

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youknowone merged 1 commit intoRustPython:mainfrom
youknowone:drop-atomic-ref
Jul 14, 2025
Merged

Impl Drop for PyAtomicRef#5970
youknowone merged 1 commit intoRustPython:mainfrom
youknowone:drop-atomic-ref

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@youknowone youknowone commented 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.

@youknowone youknowone requested a review from qingshi163 July 14, 2025 10:55
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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:

  1. 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.

  2. 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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youknowone commented Jul 14, 2025

#5968 is calling Drop, and it looks fine!

@youknowone youknowone merged commit fd35c7a into RustPython:main Jul 14, 2025
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@youknowone youknowone deleted the drop-atomic-ref branch July 14, 2025 13:54
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