From 36f101567e7a4efd118671146ce23ab46609bcb3 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Mon, 5 Jun 2017 15:14:06 +0900
Subject: [PATCH] [Modify] Replace it

---
 websocket-sharp/Server/HttpServer.cs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 195c879c..b42f2541 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -365,13 +365,20 @@ namespace WebSocketSharp.Server
       }
 
       set {
-        var msg = _state.CheckIfAvailable (true, false, false);
-        if (msg != null) {
-          _log.Error (msg);
+        string msg;
+        if (!canSet (out msg)) {
+          _log.Warn (msg);
           return;
         }
 
-        _services.KeepClean = value;
+        lock (_sync) {
+          if (!canSet (out msg)) {
+            _log.Warn (msg);
+            return;
+          }
+
+          _services.KeepClean = value;
+        }
       }
     }