…127935)

Co-authored-by: Victor Stinner <[email protected]>
Co-authored-by: Kumar Aditya <[email protected]>

…127935)

Co-authored-by: Victor Stinner <[email protected]>
Co-authored-by: Kumar Aditya <[email protected]>

…127935)

Co-authored-by: Victor Stinner <[email protected]>
Co-authored-by: Kumar Aditya <[email protected]>

sagemathgh-41021: Refactor ``atexit.pyx``
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->
I have refactor the ``atexit.pyx`` since for python 3.14, the changes of
``atexit`` is so much for supporting the nogil version.
### Python<=3.13 Implementation:
- The ``atexit`` module stores callbacks in a C array of structs
(``atexit_callback``).
- The structure is defined in C as:
```
typedef struct {  PyObject *func;    PyObject *args;    PyObject *kwargs
;} atexit_callback;
```
- Callbacks are stored in the interp->atexit.callbacks field as a C
array
- The array can be directly accessed from Cython code using pointer
arithmetic
### Python 3.14 Implementation:
- The ``atexit`` module was refactored to use a Python ``PyList`` object
instead of a C array.
- The structure is now:
```
state.callbacks = [(func, args, kwargs), ...]  # A Python list of tuples
```
- In the C implementation, callbacks are managed with:
```
PyObject *callbacks;  // This is now a PyList
```
- Callbacks are inserted at the beginning (LIFO order) using
``PyList_Insert(state->callbacks, 0, callback)``
### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->

python/cpython@3b76682
84d4461af python/cpython#127935
    
URL: sagemath#41021
Reported by: Chenxin Zhong
Reviewer(s): Copilot, da-woods

sagemathgh-41021: Refactor ``atexit.pyx``
    
<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->
I have refactor the ``atexit.pyx`` since for python 3.14, the changes of
``atexit`` is so much for supporting the nogil version.
### Python<=3.13 Implementation:
- The ``atexit`` module stores callbacks in a C array of structs
(``atexit_callback``).
- The structure is defined in C as:
```
typedef struct {  PyObject *func;    PyObject *args;    PyObject *kwargs
;} atexit_callback;
```
- Callbacks are stored in the interp->atexit.callbacks field as a C
array
- The array can be directly accessed from Cython code using pointer
arithmetic
### Python 3.14 Implementation:
- The ``atexit`` module was refactored to use a Python ``PyList`` object
instead of a C array.
- The structure is now:
```
state.callbacks = [(func, args, kwargs), ...]  # A Python list of tuples
```
- In the C implementation, callbacks are managed with:
```
PyObject *callbacks;  // This is now a PyList
```
- Callbacks are inserted at the beginning (LIFO order) using
``PyList_Insert(state->callbacks, 0, callback)``
### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->

python/cpython@3b76682
84d4461af python/cpython#127935
    
URL: sagemath#41021
Reported by: Chenxin Zhong
Reviewer(s): Copilot, da-woods