# HG changeset patch
# User Augie Fackler <augie@google.com>
# Date 2018-03-13 22:04:37
# Node ID b0ffcb5403573a47ad6be3db08a4bc4e1d43c87b
# Parent  45bfcd16f27e6d5988dfa8b2165bede17b41468c

commandserver: prefer first-party selectors module from Python 3 to backport

Caught by some deprecation warnings on Python 3.7.

Differential Revision: https://phab.mercurial-scm.org/D2844

diff --git a/mercurial/commandserver.py b/mercurial/commandserver.py
--- a/mercurial/commandserver.py
+++ b/mercurial/commandserver.py
@@ -16,8 +16,13 @@ import socket
 import struct
 import traceback
 
+try:
+    import selectors
+    selectors.BaseSelector
+except ImportError:
+    from .thirdparty import selectors2 as selectors
+
 from .i18n import _
-from .thirdparty import selectors2
 from . import (
     encoding,
     error,
@@ -476,8 +481,8 @@ class unixforkingservice(object):
     def _mainloop(self):
         exiting = False
         h = self._servicehandler
-        selector = selectors2.DefaultSelector()
-        selector.register(self._sock, selectors2.EVENT_READ)
+        selector = selectors.DefaultSelector()
+        selector.register(self._sock, selectors.EVENT_READ)
         while True:
             if not exiting and h.shouldexit():
                 # clients can no longer connect() to the domain socket, so