So here we need to copy this code and paste in the existing codes of Dyna Example for cCoroutine header.

Code for Server.cc:

#include “DynaPacket_m.h”

#include “omnetpp/ccoroutine.h”

using namespace omnetpp;

class Server : public cSimpleModule

{

  private:

    cModuleType *srvProcType;

    int counter = 0;

    cCoroutine coroutine; // Coroutine instance

    void logCoroutineActivity(const std::string& message);

  protected:

    virtual void initialize() override;

    virtual void handleMessage(cMessage *msg) override;

    static void serverProcess(void *arg);

};

Define_Module(Server);

void Server::initialize()

{

    srvProcType = cModuleType::find(“ServerProcess”);

    coroutine.setup(serverProcess, this, 1024 * 1024); // 1 MB stack size

}

void Server::handleMessage(cMessage *msg)

{

    DynaPacket *pk = check_and_cast<DynaPacket *>(msg);

    if (pk->getKind() == DYNA_CONN_REQ) {

        std::string name = opp_stringf(“conn-%d”, ++counter);

        cModule *mod = srvProcType->createScheduleInit(name.c_str(), this);

        EV << “DYNA_CONN_REQ: Created process ID=” << mod->getId() << endl;

        sendDirect(pk, mod, “in”);

        cCoroutine::switchTo(&coroutine);

    }

    else {

        int serverProcId = pk->getServerProcId();

        EV << “Redirecting msg to process ID=” << serverProcId << endl;

        cModule *mod = getSimulation()->getModule(serverProcId);

        if (!mod) {

            EV << ” That process already exited, deleting msg\n”;

            delete pk;

        }

        else {

            sendDirect(pk, mod, “in”);

        }

    }

}

void Server::logCoroutineActivity(const std::string& message)

{

    EV << message << endl;

}

void Server::serverProcess(void *arg)

{

    Server *server = static_cast<Server *>(arg);

    server->logCoroutineActivity(“Coroutine is running for connection handling.”);

    cCoroutine::switchToMain();

}