From 2337086736a6adeb2de6f66739b66ecd77535997 Mon Sep 17 00:00:00 2001
From: Ethan Buchman <ethan@coinculture.info>
Date: Thu, 12 Jan 2017 14:32:48 -0500
Subject: [PATCH] use mtx in OnStop

---
 events.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/events.go b/events.go
index 9d4f2fa2..15cbfd5b 100644
--- a/events.go
+++ b/events.go
@@ -54,6 +54,8 @@ func (evsw *eventSwitch) OnStart() error {
 }
 
 func (evsw *eventSwitch) OnStop() {
+	evsw.mtx.Lock()
+	defer evsw.mtx.Unlock()
 	evsw.BaseService.OnStop()
 	evsw.eventCells = nil
 	evsw.listeners = nil