From 6fed6029be14e2932abaf7d8be03cc91cefd7fe3 Mon Sep 17 00:00:00 2001
From: Otto Moerbeek <otto.moerbeek@open-xchange.com>
Date: Fri, 10 May 2019 13:45:00 +0200
Subject: [PATCH] Minimal fix to avoid busy looping. The condition_variable
 varant showed spurious failures on travis so go for the minimial fix.

---
 pdns/communicator.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pdns/communicator.cc b/pdns/communicator.cc
index 7db5a3e5b6..7fd59e450e 100644
--- a/pdns/communicator.cc
+++ b/pdns/communicator.cc
@@ -136,7 +136,10 @@ void CommunicatorClass::mainloop(void)
           if (extraSlaveRefresh)
             slaveRefresh(&P);
         }
-        else { 
+        else {
+          // eat up extra posts to avoid busy looping if many posts were done
+          while (d_any_sem.tryWait() == 0) {
+          }
           break; // something happened
         }
         // this gets executed at least once every second
-- 
2.47.2