C++ Program To Implement Stop and Wait Flow Control Protocol

In this strategy for flow control, the sender sends a single frame to receiver and waits for an affirmation. • The following frame is sent by sender just when affirmation of past frame is gotten. • This process of sending a frame and waiting for an affirmation proceeds as long as the sender has data to send. • To finish up the transmission sender transmits end of transmission (EOT) frame. • The fundamental favorable position of stop and wait protocols is its precision. Next frame is transmitted just when the principal frame is recognized. So there is zero chance of frame being lost. • The fundamental drawback of this technique is that it is wasteful. It makes the transmission process moderate.

C++ program to Implement Stop and Wait Flow Control Protocol

#include<iostream>

#include <time.h>

#include <cstdlib>

#include<ctime>

#include <unistd.h>

using namespace std;

class timer {

   private:

   unsigned long begTime;

   public:

   void start() {

   begTime = clock();

   }

unsigned long elapsedTime() {

   return ((unsigned long) clock() - begTime) / CLOCKS_PER_SEC;

  }

  bool isTimeout(unsigned long seconds) {

   return seconds >= elapsedTime();

   }

};

int main()

{

int frames[] = {1,2,3,4,5,6,7,8,9,10};

unsigned long seconds = 5;

srand(time(NULL));

timer t;

cout<<"Sender has to send frames : ";

for(int i=0;i<10;i++)

    cout<<frames[i]<<" ";

cout<<endl;

int count = 0;

bool delay = false;

cout<<endl<<"Sender\t\t\t\t\tReceiver"<<endl;

do

{

    bool timeout = false;

    cout<<"Sending Frame : "<<frames[count];

    cout.flush();

    cout<<"\t\t";

    t.start();

    if(rand()%2)

    {

        int to = 24600 + rand()%(64000 - 24600)  + 1;

        for(int i=0;i<64000;i++)

            for(int j=0;j<to;j++) {}

    }

    if(t.elapsedTime() <= seconds)

    {

        cout<<"Received Frame : "<<frames[count]<<" ";

        if(delay)

        {

            cout<<"Duplicate";

            delay = false;

        }

        cout<<endl;

        count++;

    }

    else

    {

        cout<<"---"<<endl;

        cout<<"Timeout"<<endl;

        timeout = true;

    }

    t.start();

    if(rand()%2 || !timeout)

    {

        int to = 24600 + rand()%(64000 - 24600)  + 1;

        for(int i=0;i<64000;i++)

            for(int j=0;j<to;j++) {}

        if(t.elapsedTime() > seconds )

        {

            cout<<"Delayed Ack"<<endl;

            count--;

            delay = true;

        }

        else if(!timeout)

            cout<<"Acknowledgement : "<<frames[count]-1<<endl;

    }

}while(count!=10);

return 0;

}

OUTPUT

Sender has to send frames : 1 2 3 4 5 6 7 8 9 10

Sender    Receiver

Sending Frame : 1    Received Frame : 1

Acknowledgement : 1

Sending Frame : 2    ---

Timeout

Sending Frame : 2    Received Frame : 2

Acknowledgement : 2

Sending Frame : 3    Received Frame : 3

Acknowledgement : 3

Sending Frame : 4    Received Frame : 4

Acknowledgement : 4

Sending Frame : 5    Received Frame : 5

Acknowledgement : 5

Sending Frame : 6    Received Frame : 6

Acknowledgement : 6

Sending Frame : 7    Received Frame : 7

Delayed Ack

Sending Frame : 7    Received Frame : 7 Duplicate

Delayed Ack

Sending Frame : 7    ---

Timeout

Sending Frame : 7    Received Frame : 7 Duplicate

Acknowledgement : 7

Sending Frame : 8    ---

Timeout

Delayed Ack

Sending Frame : 7    Received Frame : 7

Acknowledgement : 7

Sending Frame : 8    Received Frame : 8

Acknowledgement : 8

Sending Frame : 9    Received Frame : 9

Delayed Ack

Sending Frame : 9    ---

Timeout

Sending Frame : 9    Received Frame : 9 Duplicate

Delayed Ack

Sending Frame : 9    Received Frame : 9 Duplicate

Acknowledgement : 9

Sending Frame : 10    ---

Timeout

Sending Frame : 10    Received Frame : 10

Acknowledgement : 10

You must be also searching for these programming languages :

• C++ Program To Implement Manchester and Differential Manchester Encoding

• C++ Program To Implement Go Back N

• C++  Program To Implement Cyclic Redundancy Code

• C++ Program To Implement Hamming Code

tags : C++ ,programs of C++ , C++ programs , C++ tutorials , tutorialspoint, stop and flow control ,learn C++.computer networks, learn programming. packets.