How to Implement Network PID Management in OMNeT++
To implement the Network Process ID (PID) management in OMNeT++ that means to handle the distinctive identifiers for processes or services running on network nodes. We have to simulate the concept familiar to PID management by generating unique identifiers for network processes or services on each node because OMNeT++ doesn’t handle OS level PIDs. It is very useful in situation where multiple processes or applications running on the same or several nodes required be distinctively detecting and handling. To set up Network PID Management in the OMNeT++ tool, omnet-manual.com will provide you with full guidance.
Below we provided the details on how you can simulate basic PID management in OMNeT++ using the INET framework:
Step-by-Step Implementation:
- Set Up OMNeT++ and INET Framework
- Install OMNeT++: Make certain to install the OMNeT++ on your system.
- Install INET Framework: Download and install the INET framework that has models for network protocols, nodes, and more.
- Define the Network Topology
Start by describing a network topology that has several nodes. Each node can imitate multiple processes or services, each recognised by a unique PID.
Example NED File (PIDManagementNetwork.ned):
package mynetwork;
import inet.node.inet.StandardHost;
import inet.node.inet.Router;
network PIDManagementNetwork
{
parameters:
int numNodes = default(3); // Number of nodes in the network
submodules:
node[numNodes]: StandardHost {
@display(“p=100,100;is=square,red”);
}
router: Router {
@display(“p=300,200”);
}
connections allowunconnected:
for i = 0..numNodes-1 {
node[i].ethg++ <–> ethernetLine <–> router.ethg++;
}
}
- Create a PID Management Protocol
We can generate a custom protocol that allots and manages PIDs for several processes on each node. This protocol will mimics the assignment of PIDs and permit for communication amongst processes based on their PIDs.
Example: PID Management Protocol (PIDManagementProtocol.ned)
package mynetwork;
import inet.applications.base.ApplicationBase;
simple PIDManagementProtocol extends ApplicationBase
{
gates:
input upperLayerIn;
output upperLayerOut;
input lowerLayerIn;
output lowerLayerOut;
}
PIDManagementProtocol.cc (Basic Implementation)
#include “inet/common/INETDefs.h”
#include “inet/applications/base/ApplicationBase.h”
Define_Module(PIDManagementProtocol);
void PIDManagementProtocol::initialize(int stage) {
ApplicationBase::initialize(stage);
if (stage == INITSTAGE_LOCAL) {
currentPID = 1000; // Start PIDs from 1000
pidMap = new std::map<int, std::string>(); // PID to process name mapping
}
}
int PIDManagementProtocol::assignPID(const std::string& processName) {
int pid = currentPID++;
(*pidMap)[pid] = processName;
EV << “Assigned PID ” << pid << ” to process ” << processName << “\n”;
return pid;
}
void PIDManagementProtocol::handleMessageWhenUp(cMessage *msg) {
if (msg->getArrivalGate() == upperLayerIn) {
handleUpperMessage(msg);
} else {
handleLowerMessage(msg);
}
}
void PIDManagementProtocol::handleUpperMessage(cMessage *msg) {
// Simulate a process starting and being assigned a PID
std::string processName = msg->getName();
int pid = assignPID(processName);
// Send a response back with the assigned PID
cMessage *response = new cMessage(std::to_string(pid).c_str());
send(response, “upperLayerOut”);
delete msg;
}
void PIDManagementProtocol::handleLowerMessage(cMessage *msg) {
// Handle messages based on the PID
int pid = std::stoi(msg->getName());
if (pidMap->find(pid) != pidMap->end()) {
EV << “Received message for process ” << (*pidMap)[pid] << ” with PID ” << pid << “\n”;
} else {
EV << “Received message for unknown PID ” << pid << “\n”;
}
delete msg;
}
void PIDManagementProtocol::finish() {
delete pidMap;
}
In this sample:
- currentPID: Finds the next available PID.
- pidMap: Maps PIDs to process names or identifiers.
- assignPID(): Allots a unique PID to a process.
- handleUpperMessage(): Simulates a process requesting a PID and receiving one.
- handleLowerMessage(): Manages messages routed to a certain PID.
- Configure the Simulation
Set up the simulation in the omnetpp.ini file to use the custom PID management protocol.
Example Configuration in omnetpp.ini:
network = PIDManagementNetwork
**.node[*].applications[0].typename = “PIDManagementProtocol”
- Run the Simulation
Run the simulation and monitor how PIDs are allocated and handled on each node. You can simulate communication amongst processes on numerous nodes by sending messages that has PIDs as their identifiers.
Example Configuration to Simulate Process Communication:
network = PIDManagementNetwork
**.node[0].numApps = 2
**.node[0].app[0].typename = “PIDManagementProtocol”
**.node[0].app[1].typename = “UdpBasicApp”
**.node[0].app[1].destAddr = “192.168.1.2”
**.node[0].app[1].destPort = 1000
**.node[1].numApps = 1
**.node[1].app[0].typename = “PIDManagementProtocol”
- Verify PID Management
After running the simulation, certify that PIDs are properly allocated and that processes can communicate using these PIDs. Check the store to make sure that messages are routed to the correct processes based on their PIDs.
- Extend the PID Management Protocol
You can extend the PID management protocol to contain features like:
- Process Termination: Allocate processes to release their PIDs when they terminate.
- PID Reuse: Execute logic to reuse PIDs after processes terminate.
- Inter-Process Communication (IPC): Mimic communication amongst processes on the same or various nodes using PIDs.
Example: Process Termination and PID Reuse
void PIDManagementProtocol::terminateProcess(int pid) {
if (pidMap->find(pid) != pidMap->end()) {
EV << “Terminating process ” << (*pidMap)[pid] << ” with PID ” << pid << “\n”;
pidMap->erase(pid); // Remove the process from the map
} else {
EV << “Attempted to terminate unknown PID ” << pid << “\n”;
}
}
int PIDManagementProtocol::assignPID(const std::string& processName) {
if (!freePIDs.empty()) {
int pid = *freePIDs.begin();
freePIDs.erase(freePIDs.begin());
(*pidMap)[pid] = processName;
EV << “Reassigned PID ” << pid << ” to process ” << processName << “\n”;
return pid;
} else {
int pid = currentPID++;
(*pidMap)[pid] = processName;
EV << “Assigned new PID ” << pid << ” to process ” << processName << “\n”;
return pid;
}
}
- Document and Report Findings
Once completing the simulations, document the PID management strategies tested, the results achieved, and any enhancements made. This will help in understanding how PID management influences process communication and resource allocation in the simulated network.
In this step-by-step demonstration, we comprehensively concentrate and make you understand the implementation of Network PID management in OMNeT+ by using INET framework’s protocols. If you need any extra information of this topic, we will provide you.