Enable free-threading

Author: blink1073

.github/workflows/dist-python.yml

@@ -39,7 +39,7 @@ jobs:
         - [ubuntu-24.04, manylinux_aarch64]
         - [macos-14, macosx_*]
         - [windows-2019, win_amd64]
-        python: ["cp39", "cp310", "cp311", "cp312", "cp313"]
+        python: ["cp39", "cp310", "cp311", "cp312", "cp313", "cp313t"]
         exclude:
           - buildplat: [macos-14, macosx_*]
             python: "cp39"
@@ -85,6 +85,7 @@ jobs:
         env:
           MACOS_TEST_SKIP: "*arm64"
           CIBW_BUILD: cp39-macosx_*
+          CIBW_ENABLE: cpython-freethreading
           MACOSX_DEPLOYMENT_TARGET: "10.14"
         run: python -m cibuildwheel --output-dir wheelhouse
 

.github/workflows/test-python.yml

@@ -37,7 +37,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.13t"]
       fail-fast: false
     name: CPython ${{ matrix.python-version }}-${{ matrix.os }}
     steps:

bindings/python/CHANGELOG.md

@@ -6,6 +6,7 @@
 # Changes in Version 1.8.0 (2025/MM/YY)
 
 - Add support for PyArrow 20.0.
+- Add support for free-threaded python.
 
 # Changes in Version 1.7.2 (2025/04/23)
 

bindings/python/pymongoarrow/lib.pyx

@@ -15,6 +15,7 @@
 # Cython compiler directives
 # distutils: language=c++
 # cython: language_level=3
+# cython: freethreading_compatible = True
 
 # Stdlib imports
 import sys

bindings/python/pymongoarrow/libarrow.pxd

@@ -15,6 +15,7 @@
 # Cython compiler directives
 # cython: language_level=3
 # distutils: language=c++
+# cython: freethreading_compatible = True
 from libcpp.vector cimport vector
 from libc.stdint cimport int32_t, uint8_t
 from pyarrow.lib cimport *

bindings/python/pymongoarrow/libbson.pxd

@@ -15,6 +15,7 @@
 # Cython compiler directives
 # cython: language_level=3
 # distutils: language=c
+# cython: freethreading_compatible = True
 from libc.stdint cimport int32_t, int64_t, uint8_t, uint32_t, uint64_t