From 1a220100bdf4087dde0d58b3183a8d9910d55e6b Mon Sep 17 00:00:00 2001
From: Ben LeMasurier <ben.lemasurier@gmail.com>
Date: Fri, 15 Dec 2017 12:56:47 -0700
Subject: [PATCH] adds missing mutex around callback map (#54)

We were missing a mutex when retrieving the caller in callback().
Triggered a test failure here: https://travis-ci.org/digitalocean/go-libvirt/jobs/317051310
---
 rpc.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/rpc.go b/rpc.go
index 3fd1816..0e2bbf0 100644
--- a/rpc.go
+++ b/rpc.go
@@ -208,7 +208,9 @@ func (l *Libvirt) listen() {
 
 // callback sends rpc responses to their respective caller.
 func (l *Libvirt) callback(id uint32, res response) {
+	l.cm.Lock()
 	c, ok := l.callbacks[id]
+	l.cm.Unlock()
 	if ok {
 		c <- res
 	}