From a5c951a6662d9028d1256f4d0ddb4dcdbbef68db Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Thu, 14 Dec 2017 15:36:56 -0800
Subject: [PATCH] remove tracking of last receiver response from SendQueue

---
 libraries/networking/src/udt/SendQueue.cpp | 16 +---------------
 libraries/networking/src/udt/SendQueue.h   |  1 -
 2 files changed, 1 insertion(+), 16 deletions(-)

diff --git a/libraries/networking/src/udt/SendQueue.cpp b/libraries/networking/src/udt/SendQueue.cpp
index 4a0500f642..b62624aab9 100644
--- a/libraries/networking/src/udt/SendQueue.cpp
+++ b/libraries/networking/src/udt/SendQueue.cpp
@@ -97,9 +97,6 @@ SendQueue::SendQueue(Socket* socket, HifiSockAddr dest, SequenceNumber currentSe
     _lastACKSequenceNumber = uint32_t(_currentSequenceNumber);
 
     _hasReceivedHandshakeACK = hasReceivedHandshakeACK;
-
-    // default the last receiver response to the current time
-    _lastReceiverResponse = QDateTime::currentMSecsSinceEpoch();
 }
 
 SendQueue::~SendQueue() {
@@ -141,9 +138,6 @@ int SendQueue::sendPacket(const Packet& packet) {
 }
     
 void SendQueue::ack(SequenceNumber ack) {
-    // this is a response from the client, re-set our timeout expiry and our last response time
-    _lastReceiverResponse = QDateTime::currentMSecsSinceEpoch();
-    
     if (_lastACKSequenceNumber == (uint32_t) ack) {
         return;
     }
@@ -170,10 +164,7 @@ void SendQueue::ack(SequenceNumber ack) {
     _emptyCondition.notify_one();
 }
 
-void SendQueue::nak(SequenceNumber start, SequenceNumber end) {
-    // this is a response from the client, re-set our timeout expiry
-    _lastReceiverResponse = QDateTime::currentMSecsSinceEpoch(); 
-    
+void SendQueue::nak(SequenceNumber start, SequenceNumber end) {    
     {
         std::lock_guard<std::mutex> nakLocker(_naksLock);
         _naks.insert(start, end);
@@ -194,9 +185,6 @@ void SendQueue::fastRetransmit(udt::SequenceNumber ack) {
 }
 
 void SendQueue::overrideNAKListFromPacket(ControlPacket& packet) {
-    // this is a response from the client, re-set our timeout expiry
-    _lastReceiverResponse = QDateTime::currentMSecsSinceEpoch();
-
     {
         std::lock_guard<std::mutex> nakLocker(_naksLock);
         _naks.clear();
@@ -241,8 +229,6 @@ void SendQueue::handshakeACK() {
         _hasReceivedHandshakeACK = true;
     }
 
-    _lastReceiverResponse = QDateTime::currentMSecsSinceEpoch();
-
     // Notify on the handshake ACK condition
     _handshakeACKCondition.notify_one();
 }
diff --git a/libraries/networking/src/udt/SendQueue.h b/libraries/networking/src/udt/SendQueue.h
index b33180c1e2..a11aacdb91 100644
--- a/libraries/networking/src/udt/SendQueue.h
+++ b/libraries/networking/src/udt/SendQueue.h
@@ -130,7 +130,6 @@ private:
     
     std::atomic<int> _estimatedTimeout { 0 }; // Estimated timeout, set from CC
     std::atomic<int> _syncInterval { udt::DEFAULT_SYN_INTERVAL_USECS }; // Sync interval, set from CC
-    std::atomic<int64_t> _lastReceiverResponse { 0 }; // Timestamp for the last time we got new data from the receiver (ACK/NAK)
     
     std::atomic<int> _flowWindowSize { 0 }; // Flow control window size (number of packets that can be on wire) - set from CC