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.

diff --git a/black.py b/black.py
index c1cc08021f313fe7fdec00c75bdccf53b2d24f0c..8855c37ca28e51c1de6df487bfc5ca87323c61b0 100644 (file)
--- a/black.py
+++ b/black.py
@@ -8,7 +8,7 @@ import io
 import itertools
 import keyword
 import logging
 import itertools
 import keyword
 import logging

-from multiprocessing import Manager
+from multiprocessing import Manager, freeze_support

 import os
 from pathlib import Path
 import pickle
 import os
 from pathlib import Path
 import pickle


@@ -3658,6 +3658,7 @@ def patch_click() -> None:
 
 
 def patched_main() -> None:
 
 
 def patched_main() -> None:

+    freeze_support()

     patch_click()
     main()
 
     patch_click()
     main()
 

diff --git a/blackd.py b/blackd.py
index c5aa29cdec07e2e92374b7275c0713b488949a44..1a3b3690bc3b38b41b034eadf41cb271c203d185 100644 (file)
--- 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 concurrent.futures import Executor, ProcessPoolExecutor
 from functools import partial
 import logging

+from multiprocessing import freeze_support

 
 from aiohttp import web
 import aiohttp_cors
 
 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:
 
 
 def patched_main() -> None:

+    freeze_support()

     black.patch_click()
     main()
 
     black.patch_click()
     main()