Stop daemons using 100% CPU and hammering the DB server when the queue is empty (DBQueueManager-based only)

1 files changed, 3 insertions, 1 deletions

diff --git a/lib/dbqueuemanager.php b/lib/dbqueuemanager.php
index a37a8ffdf..1df5af6c1 100644
--- a/lib/dbqueuemanager.php
+++ b/lib/dbqueuemanager.php
@@ -88,7 +88,9 @@ class DBQueueManager extends QueueManager
 
         do {
             $qi = Queue_item::top($queue);
-            if (!empty($qi)) {
+            if (empty($qi)) {
+	    	sleep(1);
+            } else {
                 $notice = Notice::staticGet('id', $qi->notice_id);
                 if (!empty($notice)) {
                     $result = $notice;