One sender thread per client. Requires loads of resources. Kind of hacked, because the internal dependencies are very ugly now. Requires loads of testing. A problem might be the last packet sent by the server to a specific client before closing the connection, for example an error message. It might never even reach the client, because the sender thread is terminated before. I have not yet found a good way to fix this.

src/net/clientcontext.h

@@ -24,6 +24,9 @@
 #include <net/netcontext.h>
 #include <net/receivebuffer.h>
 #include <net/sessiondata.h>
+#include <boost/shared_ptr.hpp>
+
+class SenderCallback;
 
 class ClientContext : public NetContext
 {
@@ -105,6 +108,7 @@ private:
 	std::string			m_cacheDir;
 	bool				m_hasSubscribedLobbyMsg;
 	ReceiveBuffer		m_receiveBuffer;
+	boost::shared_ptr<SenderCallback> m_senderCallback;
 };
 
 #endif