From 996ad891f462d84530102b0f042d78f6e6b9565f Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <tgoodlet@gmail.com>
Date: Sun, 19 Aug 2018 16:11:57 -0400
Subject: [PATCH] py3.6 is missing this attr

---
 tractor/_forkserver_hackzorz.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tractor/_forkserver_hackzorz.py b/tractor/_forkserver_hackzorz.py
index ec60b5c..edd282d 100644
--- a/tractor/_forkserver_hackzorz.py
+++ b/tractor/_forkserver_hackzorz.py
@@ -29,6 +29,8 @@ SIGNED_STRUCT = struct.Struct('q')     # large enough for pid_t
 
 class PatchedForkServer(ForkServer):
 
+    _forkserver_pid = None
+
     def connect_to_new_process(self, fds):
         '''Request forkserver to create a child process.