Fixed insignificant error in Poco, shown by TSan [#CLICKHOUSE-2].

contrib/libpoco/Net/include/Poco/Net/TCPServer.h

@@ -28,6 +28,8 @@
 #include "Poco/Thread.h"
 #include "Poco/ThreadPool.h"
 
+#include <atomic>
+
 
 namespace Poco {
 namespace Net {
@@ -63,7 +65,7 @@ class Net_API TCPServer: public Poco::Runnable
 	/// on the number of connections waiting to be served.
 	///
 	/// It is possible to specify a maximum number of queued connections.
-	/// This prevents the connection queue from overflowing in the 
+	/// This prevents the connection queue from overflowing in the
 	/// case of an extreme server load. In such a case, connections that
 	/// cannot be queued are silently and immediately closed.
 	///
@@ -121,7 +123,7 @@ class Net_API TCPServer: public Poco::Runnable
 
 	const TCPServerParams& params() const;
 		/// Returns a const reference to the TCPServerParam object
-		/// used by the server's TCPServerDispatcher.	
+		/// used by the server's TCPServerDispatcher.
 
 	void start();
 		/// Starts the server. A new thread will be
@@ -138,7 +140,7 @@ class Net_API TCPServer: public Poco::Runnable
 		/// Already handled connections will continue to be served.
 		///
 		/// Once the server has been stopped, it cannot be restarted.
-		
+
 	int currentThreads() const;
 		/// Returns the number of currently used connection threads.
 
@@ -147,13 +149,13 @@ class Net_API TCPServer: public Poco::Runnable
 
 	int totalConnections() const;
 		/// Returns the total number of handled connections.
-		
+
 	int currentConnections() const;
 		/// Returns the number of currently handled connections.
 
 	int maxConcurrentConnections() const;
-		/// Returns the maximum number of concurrently handled connections.	
-		
+		/// Returns the maximum number of concurrently handled connections.
+
 	int queuedConnections() const;
 		/// Returns the number of queued connections.
 
@@ -180,11 +182,11 @@ class Net_API TCPServer: public Poco::Runnable
 	TCPServer();
 	TCPServer(const TCPServer&);
 	TCPServer& operator = (const TCPServer&);
-	
+
 	ServerSocket         _socket;
 	TCPServerDispatcher* _pDispatcher;
 	Poco::Thread         _thread;
-	bool                 _stopped;
+	std::atomic<bool>    _stopped;
 };