From 74c80a78a6c8b7c5a6a7cd3ae0b4d788669b3d28 Mon Sep 17 00:00:00 2001
From: Ivan Levkivskyi <levkivskyi@gmail.com>
Date: Tue, 6 Oct 2026 17:35:11 +0100
Subject: [PATCH] Fix psutil.cpu_affinity() not available on NetBSD

---
 mypy/util.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mypy/util.py b/mypy/util.py
index 5ad45af77e329..d6a8b1eccef3b 100644
--- a/mypy/util.py
+++ b/mypy/util.py
@@ -1009,8 +1009,8 @@ def get_available_threads() -> int:
     # Not available on old Python versions on some platforms.
     if sys.platform == "linux":
         affinity = os.sched_getaffinity(0)
-    if PSUTIL_AVAILABLE and sys.platform != "darwin":
-        # Currently not supported on macOS.
+    if PSUTIL_AVAILABLE and (psutil.LINUX or psutil.WINDOWS or psutil.FREEBSD):
+        # Currently not supported on macOS and NetBSD.
         affinity = psutil.Process().cpu_affinity()
 
     assert cpu_count is not None