From ff1eef77c58ad35b42a5c0ba1f69e7c7f6516067 Mon Sep 17 00:00:00 2001
From: "Dustin J. Mitchell" <dustin@buildbot.net>
Date: Sun, 14 Dec 2014 14:29:40 -0500
Subject: [PATCH] add comment for serializing remoteCommand

---
 master/buildbot/process/remotecommand.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/master/buildbot/process/remotecommand.py b/master/buildbot/process/remotecommand.py
index 6a6ecadf295..04bb2cf279a 100644
--- a/master/buildbot/process/remotecommand.py
+++ b/master/buildbot/process/remotecommand.py
@@ -64,6 +64,9 @@ def __init__(self, remote_command, args, ignore_updates=False,
         self.builder_name = None
         self.commandID = None
         self.deferred = None
+        # a lock to make sure that only one log-handling method runs at a time.
+        # This is really only a problem with old-style steps, which do not
+        # wait for the Deferred from one method before invoking the next.
         self.loglock = defer.DeferredLock()
 
     def __repr__(self):