From c94e2bdc8b71dcf1925edf76aaef1fa8095c5456 Mon Sep 17 00:00:00 2001
From: Stephen Birarda <commit@birarda.com>
Date: Wed, 16 Mar 2016 08:53:31 -0700
Subject: [PATCH] grab the now timestamp only when needed

---
 libraries/networking/src/udt/SendQueue.cpp | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/libraries/networking/src/udt/SendQueue.cpp b/libraries/networking/src/udt/SendQueue.cpp
index 3149c5c7bf..8e5141b58a 100644
--- a/libraries/networking/src/udt/SendQueue.cpp
+++ b/libraries/networking/src/udt/SendQueue.cpp
@@ -29,6 +29,7 @@
 #include "Socket.h"
 
 using namespace udt;
+using namespace std::chrono;
 
 template <typename Mutex1, typename Mutex2>
 class DoubleLock {
@@ -303,15 +304,12 @@ void SendQueue::run() {
         if (_state != State::Running || isInactive(sentAPacket)) {
             return;
         }
-        
-        // grab the current HRC timestamp
-        const auto now = p_high_resolution_clock::now();
 
         // push the next packet timestamp forwards by the current packet send period
         nextPacketTimestamp += std::chrono::microseconds(_packetSendPeriod);
 
         // sleep as long as we need until next packet send, if we can
-        const auto timeToSleep = std::chrono::duration_cast<std::chrono::microseconds>(nextPacketTimestamp - now);
+        const auto timeToSleep = duration_cast<microseconds>(nextPacketTimestamp - p_high_resolution_clock::now());
 
         std::this_thread::sleep_for(timeToSleep);
     }