From b35a064eaea827f67c9aab9283be50657d2e8875 Mon Sep 17 00:00:00 2001
From: ppigazzini <pasquale.pigazzini@gmail.com>
Date: Sun, 26 Apr 2026 09:39:32 +0200
Subject: [PATCH] ci: cancel stale workflow runs per PR or ref

Add workflow-level concurrency to the direct GitHub Actions entrypoints so a
newer run for the same pull request or repository ref cancels the older
in-progress run.

Keep the reusable workflow graph, release guards, triggers, and permissions
unchanged while documenting the concurrency policy and the official GitHub
references used for the change.

closes https://github.com/official-stockfish/Stockfish/pull/6773

No functional change.
---
 .github/workflows/clang-format.yml | 4 ++++
 .github/workflows/codeql.yml       | 4 ++++
 .github/workflows/stockfish.yml    | 5 +++++
 3 files changed, 13 insertions(+)

diff --git a/.github/workflows/clang-format.yml b/.github/workflows/clang-format.yml
index 3d283aa8f..19f3235d1 100644
--- a/.github/workflows/clang-format.yml
+++ b/.github/workflows/clang-format.yml
@@ -12,6 +12,10 @@ on:
       - "**.cpp"
       - "**.h"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 permissions:
   pull-requests: write
 
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 775a543bb..f23f19849 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -9,6 +9,10 @@ on:
   schedule:
     - cron: "17 18 * * 1"
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   analyze:
     name: Analyze
diff --git a/.github/workflows/stockfish.yml b/.github/workflows/stockfish.yml
index 3e69d9225..0d5bceebf 100644
--- a/.github/workflows/stockfish.yml
+++ b/.github/workflows/stockfish.yml
@@ -11,6 +11,11 @@ on:
     branches:
       - master
       - tools
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   Prerelease:
     if: github.repository == 'official-stockfish/Stockfish' && (github.ref == 'refs/heads/master' || (startsWith(github.ref_name, 'sf_') && github.ref_type == 'tag'))