From fe24a15b84955130f23c8ab9490d1cdb98607b53 Mon Sep 17 00:00:00 2001
From: Peter Stensmyr <peter.stensmyr@gmail.com>
Date: Sat, 15 Dec 2018 02:01:50 +1100
Subject: [PATCH 1/1] Fix multiprocessing support for Windows binary (#632)

* Fix multiprocessing support for Windows binary

The black and blackd binaries generated for Windows builds would fail on
reformatting multiple files due to a Windows-specific
multiprocessing issue. Fix by calling freeze_support() as
described in Python docs.
---
 black.py  | 3 ++-
 blackd.py | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/black.py b/black.py
index c1cc080..8855c37 100644
--- a/black.py
+++ b/black.py
@@ -8,7 +8,7 @@ import io
 import itertools
 import keyword
 import logging
-from multiprocessing import Manager
+from multiprocessing import Manager, freeze_support
 import os
 from pathlib import Path
 import pickle
@@ -3658,6 +3658,7 @@ def patch_click() -> None:
 
 
 def patched_main() -> None:
+    freeze_support()
     patch_click()
     main()
 
diff --git a/blackd.py b/blackd.py
index c5aa29c..1a3b369 100644
--- a/blackd.py
+++ b/blackd.py
@@ -2,6 +2,7 @@ import asyncio
 from concurrent.futures import Executor, ProcessPoolExecutor
 from functools import partial
 import logging
+from multiprocessing import freeze_support
 
 from aiohttp import web
 import aiohttp_cors
@@ -130,6 +131,7 @@ async def handle(request: web.Request, executor: Executor) -> web.Response:
 
 
 def patched_main() -> None:
+    freeze_support()
     black.patch_click()
     main()
 
-- 
2.39.5