Fix not joint thread in stratum

libstratum/EthStratumClient.cpp

@@ -54,7 +54,8 @@ EthStratumClient::EthStratumClient(GenericFarm<EthashProofOfWork> * f, MinerType
 
 EthStratumClient::~EthStratumClient()
 {
-
+	m_io_service.stop();
+	m_serviceThread.join();
 }
 
 void EthStratumClient::setFailover(string const & host, string const & port)
@@ -81,7 +82,7 @@ void EthStratumClient::connect()
 
 	cnote << "Connecting to stratum server " << p_active->host + ":" + p_active->port;
 
-	std::thread t(boost::bind(&boost::asio::io_service::run, &m_io_service));
+	m_serviceThread = std::thread{boost::bind(&boost::asio::io_service::run, &m_io_service)};
 }
 
 #define BOOST_ASIO_ENABLE_CANCELIO 
@@ -265,7 +266,6 @@ void EthStratumClient::readResponse(const boost::system::error_code& ec, std::si
 			if (reader.parse(response.c_str(), responseObject))
 			{
 				processReponse(responseObject);
-				m_response = response;
 			}
 			else 
 			{

libstratum/EthStratumClient.h

@@ -67,7 +67,6 @@ private:
 
 	boost::mutex x_pending;
 	int m_pending;
-	string m_response;
 
 	GenericFarm<EthashProofOfWork> * p_farm;
 	boost::mutex x_current;
@@ -78,8 +77,8 @@ private:
 
 	string m_job;
 	string m_previousJob;
-	EthashAux::FullType m_dag;
 
+	std::thread m_serviceThread;  ///< The IO service thread.
 	boost::asio::io_service m_io_service;
 	tcp::socket m_socket;