From 6d35bb8d0198900de0ae418d966112bb8ab4a09b Mon Sep 17 00:00:00 2001
From: IWASE Yusuke <iwase.yusuke0@gmail.com>
Date: Mon, 8 May 2017 11:43:54 +0900
Subject: [PATCH] lib/hub: Workaround for issue of eventlet

This patch adopts the workaround which is discussing on the eventlet
team at the following:
 https://github.com/eventlet/eventlet/issues/401
This workaround is suggested by Raymond Burkholder.

Suggested-by: Raymond Burkholder <ray@oneunified.net>
Signed-off-by: IWASE Yusuke <iwase.yusuke0@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
 ryu/lib/hub.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ryu/lib/hub.py b/ryu/lib/hub.py
index 7838a0c6..a4f6118e 100644
--- a/ryu/lib/hub.py
+++ b/ryu/lib/hub.py
@@ -29,6 +29,10 @@ LOG = logging.getLogger('ryu.lib.hub')
 
 if HUB_TYPE == 'eventlet':
     import eventlet
+    # HACK:
+    # sleep() is the workaround for the following issue.
+    # https://github.com/eventlet/eventlet/issues/401
+    eventlet.sleep()
     import eventlet.event
     import eventlet.queue
     import eventlet.semaphore