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 <[email protected]>
Signed-off-by: IWASE Yusuke <[email protected]>
---
 ryu/lib/hub.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ryu/lib/hub.py b/ryu/lib/hub.py
index 7838a0c..a4f6118 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
-- 
2.7.4


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