From 7e630c7732c6ce52987509ec36200e5baee4eefe Mon Sep 17 00:00:00 2001
From: "Alexander A. Klimov" <alexander.klimov@icinga.com>
Date: Mon, 3 Dec 2018 19:05:41 +0100
Subject: [PATCH] HttpServerConnection#DataAvailableHandler(): be aware of
 being called multiple times concurrently

refs #6816
---
 lib/remote/httpserverconnection.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/remote/httpserverconnection.cpp b/lib/remote/httpserverconnection.cpp
index 356a0ffba..88234e837 100644
--- a/lib/remote/httpserverconnection.cpp
+++ b/lib/remote/httpserverconnection.cpp
@@ -351,7 +351,11 @@ void HttpServerConnection::DataAvailableHandler()
 	bool close = false;
 
 	if (!m_Stream->IsEof()) {
-		boost::recursive_mutex::scoped_lock lock(m_DataHandlerMutex);
+		boost::recursive_mutex::scoped_try_lock lock(m_DataHandlerMutex);
+		if (!lock.owns_lock()) {
+			Log(LogInformation, "HttpServerConnection", "Unable to process available data, they're already being processed in another thread");
+			return;
+		}
 
 		try {
 			while (ProcessMessage())
-- 
2.40.0