From 162ec6e7763efa260523f5cf03f635159803947d Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Thu, 15 Mar 2012 16:46:52 +0100
Subject: [PATCH] Bug fix: credit can be negative.

E.g. when a data message comes faster than its corresponding ctrl
message.

Check that it is not negative when computing balance.
---
 process.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/process.cpp b/process.cpp
index 97f2a69..b5531b0 100644
--- a/process.cpp
+++ b/process.cpp
@@ -421,7 +421,11 @@ void process::data_send(neighbor& nb)
         else
             excess_load = real_load;
 
-        double balance = nb.get_debt() - nb.get_credit();
+        double balance;
+        if (nb.get_credit() > 0.0)
+            balance = nb.get_debt() - nb.get_credit();
+        else
+            balance = nb.get_debt();
         load_to_send = std::min(excess_load,
                                 std::max(0.0, balance));
 
-- 
2.39.5