fixed race condition

Garlic.cpp

@@ -100,7 +100,7 @@ namespace garlic
 			if (ts >= it->second->tagsCreationTime + OUTGOING_TAGS_EXPIRATION_TIMEOUT)
 			{
 				if (m_Owner)
-					m_Owner->RemoveCreatedSession (it->first);
+					m_Owner->RemoveDeliveryStatusSession (it->first);
 				delete it->second;
 				it = m_UnconfirmedTagsMsgs.erase (it);
 			}	
@@ -553,10 +553,13 @@ namespace garlic
 	std::shared_ptr<GarlicRoutingSession> GarlicDestination::GetRoutingSession (
 		std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet)
 	{
-		auto it = m_Sessions.find (destination->GetIdentHash ());
-		std::shared_ptr<GarlicRoutingSession> session;
-		if (it != m_Sessions.end ())
-			session = it->second;
+		GarlicRoutingSessionPtr session;
+		{	
+			std::unique_lock<std::mutex> l(m_SessionsMutex);
+			auto it = m_Sessions.find (destination->GetIdentHash ());
+			if (it != m_Sessions.end ())
+				session = it->second;
+		}
 		if (!session)
 		{
 			session = std::make_shared<GarlicRoutingSession> (this, destination, 
@@ -582,25 +585,25 @@ namespace garlic
 		}
 	}
 	
-	void GarlicDestination::RemoveCreatedSession (uint32_t msgID)
+	void GarlicDestination::RemoveDeliveryStatusSession (uint32_t msgID)
 	{
-		m_CreatedSessions.erase (msgID);
+		m_DeliveryStatusSessions.erase (msgID);
 	}
 
-	void GarlicDestination::DeliveryStatusSent (std::shared_ptr<GarlicRoutingSession> session, uint32_t msgID)
+	void GarlicDestination::DeliveryStatusSent (GarlicRoutingSessionPtr session, uint32_t msgID)
 	{
-		m_CreatedSessions[msgID] = session;
+		m_DeliveryStatusSessions[msgID] = session;
 	}		
 
 	void GarlicDestination::HandleDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)
 	{
 		uint32_t msgID = bufbe32toh (msg->GetPayload ());
 		{
-			auto it = m_CreatedSessions.find (msgID);
-			if (it != m_CreatedSessions.end ())			
+			auto it = m_DeliveryStatusSessions.find (msgID);
+			if (it != m_DeliveryStatusSessions.end ())			
 			{
 				it->second->MessageConfirmed (msgID);
-				m_CreatedSessions.erase (it);
+				m_DeliveryStatusSessions.erase (it);
 				LogPrint (eLogDebug, "Garlic: message ", msgID, " acknowledged");
 			}	
 		}

Garlic.h

@@ -118,6 +118,7 @@ namespace garlic
 			// for HTTP only
 			size_t GetNumOutgoingTags () const { return m_SessionTags.size (); };
 	};	
+	using GarlicRoutingSessionPtr = std::shared_ptr<GarlicRoutingSession>;
 
 	class GarlicDestination: public i2p::data::LocalDestination
 	{
@@ -129,13 +130,13 @@ namespace garlic
 			void SetNumTags (int numTags) { m_NumTags = numTags; };		
 			std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet);	
 			void CleanupRoutingSessions ();
-			void RemoveCreatedSession (uint32_t msgID);
+			void RemoveDeliveryStatusSession (uint32_t msgID);
 			std::shared_ptr<I2NPMessage> WrapMessage (std::shared_ptr<const i2p::data::RoutingDestination> destination, 
 			    std::shared_ptr<I2NPMessage> msg, bool attachLeaseSet = false);
 
 			void AddSessionKey (const uint8_t * key, const uint8_t * tag); // one tag
 			virtual bool SubmitSessionKey (const uint8_t * key, const uint8_t * tag); // from different thread
-			void DeliveryStatusSent (std::shared_ptr<GarlicRoutingSession> session, uint32_t msgID);
+			void DeliveryStatusSent (GarlicRoutingSessionPtr session, uint32_t msgID);
 			
 			virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
 			virtual void ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg);			
@@ -161,12 +162,12 @@ namespace garlic
 			// outgoing sessions
 			int m_NumTags;
 			std::mutex m_SessionsMutex;
-			std::map<i2p::data::IdentHash, std::shared_ptr<GarlicRoutingSession> > m_Sessions;
+			std::map<i2p::data::IdentHash, GarlicRoutingSessionPtr> m_Sessions;
 			// incoming
 			std::map<SessionTag, std::shared_ptr<i2p::crypto::CBCDecryption>> m_Tags;
 			uint32_t m_LastTagsCleanupTime;
 			// DeliveryStatus
-			std::map<uint32_t, std::shared_ptr<GarlicRoutingSession> > m_CreatedSessions; // msgID -> session
+			std::map<uint32_t, GarlicRoutingSessionPtr> m_DeliveryStatusSessions; // msgID -> session
 			
 		public: