Build failing with Python 3.13

[kmaehashi]

One of the CuPy user reported that there is an error building fastrlock on Python 3.13. After the quick investigation, this looks happening because rlock.c bundled with the sdist is generated using older Cython which does not support Python 3.13.

% pip install -v fastrlock

... snip ...

  fastrlock/rlock.c: In function ‘__Pyx_PyInt_As_long’:
  fastrlock/rlock.c:9635:23: error: too few arguments to function ‘_PyLong_AsByteArray’
   9635 |                 ret = _PyLong_AsByteArray((PyLongObject *)v,
        |                       ^~~~~~~~~~~~~~~~~~~
  In file included from /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/longobject.h:107,
                   from /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/Python.h:81,
                   from fastrlock/rlock.c:35:
  /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/cpython/longobject.h:111:17: note: declared here
    111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
        |                 ^~~~~~~~~~~~~~~~~~~
  fastrlock/rlock.c: In function ‘__Pyx_PyInt_As_int’:
  fastrlock/rlock.c:9908:23: error: too few arguments to function ‘_PyLong_AsByteArray’
   9908 |                 ret = _PyLong_AsByteArray((PyLongObject *)v,
        |                       ^~~~~~~~~~~~~~~~~~~
  In file included from /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/longobject.h:107,
                   from /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/Python.h:81,
                   from fastrlock/rlock.c:35:
  /home/maehashi/.pyenv/versions/3.13.1/include/python3.13/cpython/longobject.h:111:17: note: declared here
    111 | PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
        |                 ^~~~~~~~~~~~~~~~~~~
  error: command '/home/maehashi/local/bin/ccache-gcc' failed with exit code 1

... snip ...

It would be great if we can see a new release including the source generated with the latest Cython (or binary packages for Python 3.13).

[leofang]

+1 it's be nice to help unblock CuPy (which in turn would unblock us 😄)

cc @szalpal @aterrel for vis

[scoder]

I released fastrlock 0.8.3 with wheels up to Py3.13.

[kmaehashi]

Thank you!