From fbf4553159c8ae4bebdef60178d1eed70d58ed87 Mon Sep 17 00:00:00 2001
From: Alan Shreve <alan@inconshreveable.com>
Date: Sun, 30 Jun 2013 18:16:16 -0700
Subject: [PATCH] Fix race condition writing items out in Save() by copying the
 cached items map

---
 CONTRIBUTORS | 1 +
 cache.go     | 5 +++--
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 418dcdf..cd4d74f 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -5,3 +5,4 @@ code was contributed.)
 
 Dustin Sallings <dustin@spy.net>
 Sergey Shepelev <temotor@gmail.com>
+Alan Shreve <alan@inconshreveable.com>
diff --git a/cache.go b/cache.go
index dd8de64..4822116 100644
--- a/cache.go
+++ b/cache.go
@@ -876,9 +876,10 @@ func (c *cache) Save(w io.Writer) (err error) {
 		}
 	}()
 	c.RLock()
-	items := c.items
-	for _, v := range items {
+	items := make(map[string]*item, len(c.items))
+	for k, v := range c.items {
 		gob.Register(v.Object)
+		items[k] = v
 	}
 	c.RUnlock()
 	err = enc.Encode(&items)