From c5304501933e2ed473a0a588a7a9b8b63d70db7d Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Wed, 4 Jan 2012 22:11:26 +0000
Subject: (svn r23752) -Fix [FS#4938]: missing locking causing crash is extreme
 case when being in the MP lobby

---
 src/network/network_udp.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/network/network_udp.cpp b/src/network/network_udp.cpp
index 58d0f31c5..94a677245 100644
--- a/src/network/network_udp.cpp
+++ b/src/network/network_udp.cpp
@@ -678,6 +678,8 @@ void NetworkUDPClose()
 /** Receive the UDP packets. */
 void NetworkBackgroundUDPLoop()
 {
+	_network_udp_mutex->BeginCritical();
+
 	if (_network_udp_server) {
 		_udp_server_socket->ReceivePackets();
 		_udp_master_socket->ReceivePackets();
@@ -685,6 +687,8 @@ void NetworkBackgroundUDPLoop()
 		_udp_client_socket->ReceivePackets();
 		if (_network_udp_broadcast > 0) _network_udp_broadcast--;
 	}
+
+	_network_udp_mutex->EndCritical();
 }
 
 #endif /* ENABLE_NETWORK */
-- 
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