fix thread safety of cffi

.github/workflows/ci.yaml

@@ -47,7 +47,7 @@ jobs:
         rm -rf dist/
         python -m pip install build
         python -m build --sdist
-        
+
         echo "sdist_artifact_name=$(ls ./dist)" >> "$GITHUB_OUTPUT"
         echo "package_version=$(ls ./dist | sed -En 's/cffi-(.+)\.tar\.gz/\1/p')" >> "$GITHUB_OUTPUT"
 
@@ -76,20 +76,20 @@ jobs:
 
           - spec: cp39-manylinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
-            
+
           - spec: cp310-manylinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
 
           - spec: cp311-manylinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
-          
+
           - spec: cp312-manylinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
 
           - spec: cp313-manylinux_x86_64
-            
+
           - spec: cp313t-manylinux_x86_64
-  
+
           - spec: cp38-manylinux_i686
             omit: ${{ env.skip_ci_redundant_jobs }}
 
@@ -107,10 +107,13 @@ jobs:
 
           - spec: cp313-manylinux_i686
             omit: ${{ env.skip_ci_redundant_jobs }}
-
+
+          - spec: cp313t-manylinux_i686
+            omit: ${{ env.skip_ci_redundant_jobs }}
+
           - spec: cp39-musllinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
-          
+
           - spec: cp310-musllinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
 
@@ -119,9 +122,11 @@ jobs:
 
           - spec: cp312-musllinux_x86_64
             omit: ${{ env.skip_ci_redundant_jobs }}
-  
+
           - spec: cp313-musllinux_x86_64
-
+
+          - spec: cp313t-musllinux_x86_64
+
           - spec: cp39-musllinux_i686
             omit: ${{ env.skip_ci_redundant_jobs }}
 
@@ -133,14 +138,14 @@ jobs:
 
           #- spec: cp312-musllinux_i686  # busted as of 2024-05-17
           #  omit: ${{ env.skip_ci_redundant_jobs }}
-  
+
           #- spec: cp313-musllinux_i686 # busted as of 2024-05-17
-  
+
           - spec: cp39-musllinux_aarch64
             foreign_arch: true
             test_args: '{package}/src/c'
             omit: ${{ env.skip_ci_redundant_jobs || env.skip_slow_jobs }}
-          
+
           - spec: cp310-musllinux_aarch64
             foreign_arch: true
             test_args: '{package}/src/c'
@@ -155,12 +160,17 @@ jobs:
             foreign_arch: true
             test_args: '{package}/src/c'
             omit: ${{ env.skip_ci_redundant_jobs || env.skip_slow_jobs }}
-  
+
           - spec: cp313-musllinux_aarch64
             foreign_arch: true
             # test_args: '{package}/src/c'
             omit: ${{ env.skip_slow_jobs}}
-
+
+          - spec: cp313t-musllinux_aarch64
+            foreign_arch: true
+            # test_args: '{package}/src/c'
+            omit: ${{ env.skip_slow_jobs}}
+
           - spec: cp38-manylinux_aarch64
             foreign_arch: true
             test_args: '{package}/src/c'
@@ -185,12 +195,17 @@ jobs:
             foreign_arch: true
             test_args: '{package}/src/c'
             omit: ${{ env.skip_slow_jobs || env.skip_ci_redundant_jobs }}
-  
+
           - spec: cp313-manylinux_aarch64
             foreign_arch: true
             # test_args: '{package}/src/c'
             omit: ${{ env.skip_slow_jobs }}
-
+
+          - spec: cp313t-manylinux_aarch64
+            foreign_arch: true
+            # test_args: '{package}/src/c'
+            omit: ${{ env.skip_slow_jobs }}
+
           - spec: cp38-manylinux_ppc64le
             foreign_arch: true
             test_args: '{package}/src/c'
@@ -220,7 +235,12 @@ jobs:
             foreign_arch: true
             test_args: '{package}/src/c'
             omit: ${{ env.skip_slow_jobs }}
-
+
+          - spec: cp313t-manylinux_ppc64le
+            foreign_arch: true
+            test_args: '{package}/src/c'
+            omit: ${{ env.skip_slow_jobs }}
+
           - spec: cp38-manylinux_s390x
             foreign_arch: true
             test_args: '{package}/src/c'
@@ -251,6 +271,11 @@ jobs:
             # test_args: '{package}/src/c'
             omit: ${{ env.skip_slow_jobs }}
 
+          - spec: cp313t-manylinux_s390x
+            foreign_arch: true
+            # test_args: '{package}/src/c'
+            omit: ${{ env.skip_slow_jobs }}
+
 
   linux:
     needs: [python_sdist, make_linux_matrix]
@@ -301,11 +326,11 @@ jobs:
         CIBW_TEST_COMMAND: PYTHONUNBUFFERED=1 python -m pytest ${{ matrix.test_args || '{project}' }}  # default to test all
       run: |
         set -eux
-        
+
         mkdir cffi
-        
+
         tar zxf ${{ steps.fetch_sdist.outputs.download-path }}/cffi*.tar.gz --strip-components=1 -C cffi
-        python -m pip install --upgrade "${{ matrix.cibw_version || 'cibuildwheel' }}"
+        python -m pip install cibuildwheel==2.23.3
 
         # actually build libffi + wheel (using env tweaks above)
         python -m cibuildwheel --output-dir dist ./cffi
@@ -408,27 +433,28 @@ jobs:
     - name: build wheel prereqs
       run: |
         set -eux
-        python3 -m pip install --user --upgrade "${{ matrix.cibw_version || 'cibuildwheel' }}"
+        python3 -m pip install --user --upgrade cibuildwheel==2.23.3
         brew uninstall --ignore-dependencies libffi 2>&1 || true
 
     - name: build/test wheels
       id: build
       env:
         CIBW_BUILD: ${{ matrix.spec }}
         CIBW_PRERELEASE_PYTHONS: 'True'
+        CIBW_FREE_THREADED_SUPPORT: 'True'
         CIBW_TEST_REQUIRES: pytest setuptools
         CIBW_TEST_COMMAND: pip install pip --upgrade; cd {project}; PYTHONUNBUFFERED=1 pytest
         MACOSX_DEPLOYMENT_TARGET: ${{ matrix.deployment_target || '10.9' }}
         SDKROOT: ${{ matrix.sdkroot || 'macosx' }}
       run: |
         set -eux
-        
+
         mkdir cffi
-        
+
         tar zxf ${{ steps.fetch_sdist.outputs.download-path }}/cffi*.tar.gz --strip-components=1 -C cffi
 
         python3 -m cibuildwheel --output-dir dist cffi
-        
+
         echo "artifact_name=$(ls ./dist/)" >> "$GITHUB_OUTPUT"
 
     - name: upload artifacts
@@ -468,7 +494,8 @@ jobs:
             omit: ${{ env.skip_ci_redundant_jobs }}
 
           - spec: cp313-win_amd64
-            # omit: ${{ env.skip_ci_redundant_jobs }}
+
+          - spec: cp313t-win_amd64
 
           - spec: cp38-win32
             omit: ${{ env.skip_ci_redundant_jobs }}
@@ -488,6 +515,9 @@ jobs:
           - spec: cp313-win32
             omit: ${{ env.skip_ci_redundant_jobs }}
 
+          - spec: cp313t-win32
+            omit: ${{ env.skip_ci_redundant_jobs }}
+
   windows:
     needs: [python_sdist, make_windows_matrix]
     runs-on: windows-2022
@@ -507,21 +537,22 @@ jobs:
       env:
         CIBW_BUILD: ${{ matrix.spec }}
         CIBW_PRERELEASE_PYTHONS: 'True'
+        CIBW_FREE_THREADED_SUPPORT: 'True'
         CIBW_TEST_REQUIRES: pytest setuptools
         CIBW_TEST_COMMAND: 'python -m pytest {package}/src/c'
         # FIXME: /testing takes ~45min on Windows and has some failures...
         # CIBW_TEST_COMMAND='python -m pytest {package}/src/c {project}/testing'
       run: |
         set -eux
-        
+
         mkdir cffi
-        
+
         tar zxf cffi*.tar.gz --strip-components=1 -C cffi
-        
+
         python -m pip install --upgrade pip
-        pip install "${{ matrix.cibw_version || 'cibuildwheel'}}"
+        pip install cibuildwheel==2.23.3
         python -m cibuildwheel --output-dir dist cffi
-        
+
         echo "artifact_name=$(ls ./dist/)" >> "$GITHUB_OUTPUT"
 
       shell: bash
@@ -545,10 +576,55 @@ jobs:
         delete-merged: true
       if: ${{ env.skip_artifact_upload != 'true' }}
 
+  pytest-run-parallel:
+    strategy:
+      matrix:
+        runner-image: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+        python-version: ['3.13t', '3.14t-dev']
+    runs-on: ${{ matrix.runner-image }}
+    steps:
+    - name: clone repo
+      uses: actions/checkout@v4
+
+    - name: install python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: build and install
+      run: |
+        python -m pip install pytest setuptools pytest-run-parallel
+        python -m pip install .
+
+    - name: run tests under pytest-run-parallel
+      if: runner.os == 'Windows'
+      run: |
+        python -m pytest --parallel-threads=4 src/c
+
+    - name: run tests under pytest-run-parallel
+      if: runner.os != 'Windows'
+      run: |
+        python -m pytest --parallel-threads=4
+
+  clang_TSAN:
+    runs-on: ubuntu-latest
+    container: ghcr.io/nascheme/numpy-tsan:3.14t
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: build and install
+      run: |
+        python -m pip install setuptools pytest pytest-run-parallel
+        CFLAGS="-g -O3 -fsanitize=thread" python -m pip install -v .
+
+    - name: run tests under pytest-run-parallel
+      run: |
+        TSAN_OPTIONS="suppressions=$PWD/suppressions_free_threading.txt" \
+        python -m pytest --parallel-threads=4 --skip-thread-unsafe=True -sv
 
   check:
     if: always()
-    needs: [python_sdist, linux, macos, windows, merge_artifacts]
+    needs: [python_sdist, linux, macos, windows, clang_TSAN, pytest-run-parallel, merge_artifacts]
     runs-on: ubuntu-latest
     steps:
     - name: Verify all previous jobs succeeded (provides a single check to sample for gating purposes)