--- a/mercurial/vfs.py	Wed May 12 10:24:17 2021 +0200
+++ b/mercurial/vfs.py	Fri May 14 10:01:29 2021 +0000
@@ -307,7 +307,7 @@
         # multiple instances puts us at risk of running out of file descriptors
         # only allow to use backgroundfilecloser when in main thread.
         if not isinstance(
-            threading.currentThread(),
+            threading.current_thread(),
             threading._MainThread,  # pytype: disable=module-attr
         ):
             yield
@@ -483,7 +483,7 @@
             fp = checkambigatclosing(fp)
 
         if backgroundclose and isinstance(
-            threading.currentThread(),
+            threading.current_thread(),
             threading._MainThread,  # pytype: disable=module-attr
         ):
             if (