Core/PacketIO: Requeue packets handled with STATUS_LOGGEDIN received …

…before player is fully loaded in one step after packet processing loop - reduces used locks from 3 per packet to 1 per packet

(cherry picked from commit 8086a39)

src/common/Threading/LockedQueue.h

@@ -57,6 +57,14 @@ class LockedQueue
         unlock();
     }
 
+    //! Adds items back to front of the queue
+    template<class Iterator>
+    void readd(Iterator begin, Iterator end)
+    {
+        std::lock_guard<std::mutex> lock(_lock);
+        _queue.insert(_queue.begin(), begin, end);
+    }
+
     //! Gets the next result in the queue, if any.
     bool next(T& result)
     {

src/server/game/Server/WorldSession.cpp

@@ -272,17 +272,11 @@ bool WorldSession::Update(uint32 diff, PacketFilter& updater)
     WorldPacket* packet = NULL;
     //! Delete packet after processing by default
     bool deletePacket = true;
-    //! To prevent infinite loop
-    WorldPacket* firstDelayedPacket = NULL;
-    //! If _recvQueue.peek() == firstDelayedPacket it means that in this Update call, we've processed all
-    //! *properly timed* packets, and we're now at the part of the queue where we find
-    //! delayed packets that were re-enqueued due to improper timing. To prevent an infinite
-    //! loop caused by re-enqueueing the same packets over and over again, we stop updating this session
-    //! and continue updating others. The re-enqueued packets will be handled in the next Update call for this session.
+    std::vector<WorldPacket*> requeuePackets;
     uint32 processedPackets = 0;
     time_t currentTime = time(NULL);
 
-    while (m_Socket && !_recvQueue.empty() && _recvQueue.peek(true) != firstDelayedPacket && _recvQueue.next(packet, updater))
+    while (m_Socket && _recvQueue.next(packet, updater))
     {
         if (packet->GetOpcode() >= NUM_MSG_TYPES)
         {
@@ -305,10 +299,7 @@ bool WorldSession::Update(uint32 diff, PacketFilter& updater)
                             //! the client to be in world yet. We will re-add the packets to the bottom of the queue and process them later.
                             if (!m_playerRecentlyLogout)
                             {
-                                //! Prevent infinite loop
-                                if (!firstDelayedPacket)
-                                    firstDelayedPacket = packet;
-                                //! Because checking a bool is faster than reallocating memory
+                                requeuePackets.push_back(packet);
                                 deletePacket = false;
                                 QueuePacket(packet);
                                 //! Log
@@ -400,6 +391,8 @@ bool WorldSession::Update(uint32 diff, PacketFilter& updater)
             break;
     }
 
+    _recvQueue.readd(requeuePackets.begin(), requeuePackets.end());
+
     if (m_Socket && m_Socket->IsOpen() && _warden)
         _warden->Update();