gh-115304: Add doc for initializing PyMutex as a global variable (#115305)

diff --git a/Include/internal/pycore_lock.h b/Include/internal/pycore_lock.h
index 07bf3db16f3d3afa3a5238867b27d9fd9c52b28a..c89159b55e130f6bc3e9f8defd8c0db45f58a195 100644 (file)
--- a/Include/internal/pycore_lock.h
+++ b/Include/internal/pycore_lock.h
@@ -26,6 +26,9 @@ extern "C" {
 // Typical initialization:
 //   PyMutex m = (PyMutex){0};
 //
+// Or initialize as global variables:
+//   static PyMutex m;
+//
 // Typical usage:
 //   PyMutex_Lock(&m);
 //   ...