1 files changed, 23 insertions, 0 deletions

diff --git a/src/net.cpp b/src/net.cpp
index 5cf2f8c..964097b 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -1700,6 +1700,13 @@ void ThreadMessageHandler(void* parg)
     }
 }
 
+// When any peer last told us a height. A wedged node -- one that still has
+// peers but has stopped hearing them -- is exactly a node where this stops
+// advancing, and that is the one thing the height comparison itself cannot
+// see: there is no height to compare.
+static int64 nLastPeerHeightSeen = 0;
+static int64 nPeerHeightFirstAsked = 0;
+
 int GetPeerMedianHeight()
 {
     vector<int> vHeights;
@@ -1711,10 +1718,26 @@ int GetPeerMedianHeight()
     if (vHeights.empty())
         return -1;
 
+    nLastPeerHeightSeen = GetTime();
     sort(vHeights.begin(), vHeights.end());
     return vHeights[vHeights.size() / 2];
 }
 
+// Seconds since any peer last reported a height.
+//
+// Before ever hearing one, measure from the first time somebody asked rather
+// than from the epoch -- otherwise a node refuses jobs the instant it starts,
+// before it has had a chance to complete a single handshake.
+int64 GetPeerHeightAgeSecs()
+{
+    int64 nNow = GetTime();
+    if (nPeerHeightFirstAsked == 0)
+        nPeerHeightFirstAsked = nNow;
+    if (nLastPeerHeightSeen == 0)
+        return nNow - nPeerHeightFirstAsked;
+    return nNow - nLastPeerHeightSeen;
+}
+
 
 // Say out loud when we are behind the network.
 //