Preventing the event processing from looping endlessly when an event

reraised itself during execution of its handlers.

testing/btest/Baseline/core.recursive-event/output

@@ -0,0 +1 @@
+10

testing/btest/core/recursive-event.bro

@@ -0,0 +1,31 @@
+# @TEST-EXEC: bro %INPUT 2>&1 | grep -v termination | sort | uniq | wc -l >output
+# @TEST-EXEC: btest-diff output
+
+# In old version, the event would keep triggering endlessely, with the network
+# time not moving forward and Bro not terminating. 
+# 
+# Note that the output will be 10 (not 20) because we still execute two rounds
+# of events every time we drain.
+
+redef exit_only_after_terminate=T;
+
+global c = 0;
+
+event test()
+        {
+	c += 1;
+
+	if ( c == 20 ) 
+		{
+		terminate();
+		return;
+		}
+	
+        print network_time();
+        event test();
+        }
+
+event bro_init()
+        {
+        event test();
+        }