X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/b60b85b234d6a575f636d0a125478115f993c90c..77f19944f632c48765175cafad07dc76b3810911:/src/black/concurrency.py

diff --git a/src/black/concurrency.py b/src/black/concurrency.py
index 1598f51..893eba6 100644
--- a/src/black/concurrency.py
+++ b/src/black/concurrency.py
@@ -80,7 +80,8 @@ def reformat_many(
 
     executor: Executor
     if workers is None:
-        workers = os.cpu_count() or 1
+        workers = int(os.environ.get("BLACK_NUM_WORKERS", 0))
+        workers = workers or os.cpu_count() or 1
     if sys.platform == "win32":
         # Work around https://bugs.python.org/issue26903
         workers = min(workers, 60)