From ed7b4d9a3e0090897d19aa1a412f46a0df7fe608 Mon Sep 17 00:00:00 2001
From: Lysandros Nikolaou <lisandrosnik@gmail.com>
Date: Mon, 27 May 2024 14:10:51 +0200
Subject: [PATCH] Set up CI for the free threaded build

---
 .github/workflows/ci.yml | 14 ++++++++++++++
 Tools/ci-run.sh          |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 266c8e83bfd..423f30bb534 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -161,6 +161,12 @@ jobs:
             python-version: pypy-3.10
             backend: c
             env: { NO_CYTHON_COMPILE: 1 }
+          # Free-threading
+          - os: ubuntu-20.04
+            python-version: 3.13-freethreading-dev
+            backend: "c,cpp"
+            env: {}
+            allowed_failure: true
 
     # This defaults to 360 minutes (6h) which is way too long and if a test gets stuck, it can block other pipelines.
     # From testing, the runs tend to take ~20 minutes for ubuntu / macos and ~40 for windows,
@@ -186,9 +192,17 @@ jobs:
 
       - name: Setup python
         uses: actions/setup-python@v5.0.0
+        if: "!endsWith(matrix.python-version, '-freethreading-dev')"
         with:
           python-version: ${{ matrix.python-version }}
 
+      - name: Setup python from deadsnakes
+        uses: deadsnakes/action@v3.1.0
+        if: "endsWith(matrix.python-version, '-freethreading-dev')"
+        with:
+          python-version: 3.13-dev
+          nogil: true
+
       - name: Compilation Cache
         uses: hendrikmuhs/ccache-action@v1.2.12
         with:
diff --git a/Tools/ci-run.sh b/Tools/ci-run.sh
index 915ae7a49b0..10f7dd6e6c2 100644
--- a/Tools/ci-run.sh
+++ b/Tools/ci-run.sh
@@ -216,6 +216,9 @@ if [[ $TEST_CODE_STYLE != "1" ]]; then
 fi
 
 export CFLAGS="$CFLAGS $EXTRA_CFLAGS"
+if [[ $PYTHON_VERSION == *"-freethreading-dev" ]]; then
+  export PYTHON_GIL=0
+fi
 python runtests.py \
   -vv $STYLE_ARGS \
   -x Debugger \