can anyone provide me with stop-and-wait protocol working code in c or c++ language

hi!
i have one c code that i have persnolly tried and it works it uses
com1 port to communicate
the code as below

/* Stop and Wait Protocol ( Flow Control ) */
#include<stdio.h>
#include<bios.h>
#include<conio.h>
#define COM1 0
#define SETTINGS 0x82
#define DTR 0x100
void main()
{
 int ch,status,i=0,true=1;
 char msg[100],ack,rec;
 clrscr();
 bioscom(0,SETTINGS,COM1);
 printf("\n 1.Transmit\n 2.Receive");
 printf("\n\n Enter the operation code : ");
 scanf("%d",&ch);
 switch(ch)
 {
  case 1 : printf("\n Enter the Message \n ");
   	     scanf("%s",&msg);
	     while(msg[i]!='\0')
	     {
	      bioscom(1,msg[i],COM1);
	      printf("\n%c",msg[i]);
	      do
	      {
	       while(1)
	       {
	        status=bioscom(3,0,COM1);
	        if(status & DTR)
	        {
	         ack=bioscom(2,0,COM1) & 0x7F;
	         if(ack=='0')
	         {
		    bioscom(1,msg[i],COM1);
		    printf("\n%c - retransmitted ",msg[i]);
	         }
	         break;
	        }
	       }
	      }while(ack!='1');
	      i++;
	     }
	     break;
  case 2 : printf("\n Receiver \t Press Escape to quit\n\n");
  	     do
	     {
	      status=bioscom(3,0,COM1);
	      if(status & DTR)
	      {
	       rec=bioscom(2,0,COM1);
	       printf("\n%c  -- Enter ACK(1 for +ve, 0 for -ve) :",rec);
	       ack=getche();
	       bioscom(1,ack,COM1);
	      }
	      if(kbhit())
	       if(getch()=='\x1b')
	        true=0;
	     }while(true);
	     break;
  default : printf("\n Invalid Selection");
 }
} 

if u have any doubts u can contact me at bipinramesh@gmail.com

You can use WaitForSingleObject() API call on windows for that
purpose. Use INFINITE as the last parameter if you want to wait
indefinitely. The function takes an object handle up on wich it waits.
It could be a signal, mutex or could be its own handle. In this case,
it would wait for ever.