From 82d81b6b3b9d689d8a381b7aa9d4269324776e54 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@oriontransfer.co.nz>
Date: Mon, 28 Oct 2019 13:31:26 +1300
Subject: [PATCH] Avoid data corruption in `#queue`.

Potential fix for #878.
---
 lib/redis.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/redis.rb b/lib/redis.rb
index afd9d628b..563415c38 100644
--- a/lib/redis.rb
+++ b/lib/redis.rb
@@ -100,7 +100,9 @@ def call(*command)
   # See http://redis.io/topics/pipelining for more details.
   #
   def queue(*command)
-    @queue[Thread.current.object_id] << command
+    synchronize do
+      @queue[Thread.current.object_id] << command
+    end
   end
 
   # Sends all commands in the queue.