handleIfSimEnd causes infinite concurrent access exceptions

[tpr1]

Version information

ed6255e

Observed behavior

After receiving SimEnd, a C++ federate will get stuck in a loop where it tries to send the Federate Resign Interaction. All attempts to send this interaction will lead to a ConcurrentAccessAttempted / currently ticking exception.

Expected behavior

The federate should exit without error.

Steps to reproduce issue

Run a C++ federate and then terminate the simulation using SimEnd.

---

The problem is that handleIfSimEnd is called during receiveInteraction:

cpswt-cpp/foundation/SynchronizedFederate/src/main/include/SynchronizedFederate.hpp

Lines 372 to 390 in 9bbac67

	virtual void receiveInteraction(
	RTI::InteractionClassHandle theInteraction,
	const RTI::ParameterHandleValuePairSet& theParameters,
	const RTI::FedTime& theTime,
	const char *theTag,
	RTI::EventRetractionHandle theHandle
	)
	throw ( RTI::InteractionClassNotKnown, RTI::InteractionParameterNotKnown, RTI::InvalidFederationTime, RTI::FederateInternalError) {
	if ( getMoreATRs() ) {
	InteractionRoot::SP interactionRootSP = InteractionRoot::create_interaction( theInteraction, theParameters, theTime );
	if ( !unmatchingFedFilterProvided(interactionRootSP) ) {
	RTIfedTime rtitime(theTime);
	double ltime = rtitime.getTime();
	handleIfSimEnd(interactionRootSP, ltime);
	addInteraction( interactionRootSP );
	interactionRootSP->createLog( ltime, false );
	}
	}
	}

It should be called like the Java equivalent after a time grant to ensure the RTI is not ticking:
https://github.com/SimIntToolkit/cpswt-core/blob/06a66ec3e390c037594b0ad6813641bff85ddf38/cpswt-core/federate-base/src/main/java/org/cpswt/hla/SynchronizedFederate.java#L1036-L1040