From: Peter van Dijk <peter.van.dijk@powerdns.com>
Date: Thu, 20 Jun 2019 08:42:55 +0000 (+0200)
Subject: avoid busy looping on incoming notify storm
X-Git-Tag: auth-4.0.8^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a1c2476aefba4a4d422e30e20c04118d201b91f0;p=thirdparty%2Fpdns.git

avoid busy looping on incoming notify storm
---

diff --git a/pdns/communicator.cc b/pdns/communicator.cc
index 48f481dcf5..d47360eb7e 100644
--- a/pdns/communicator.cc
+++ b/pdns/communicator.cc
@@ -120,7 +120,10 @@ void CommunicatorClass::mainloop(void)
 
         if(rc)
           Utility::sleep(1);
-        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