/**********************************************************************	    Project 2: Multiprogramming   By:      Jeff Hollingsworth  e-mail:      hollings@cs.umd.edu  File:        proc2.c  Created on:  3/6/1996  Contents:    User Processes to be run concurrently	  1.    Init() : Initial process, creates other ones & terminates	  2..4  Long() , Ping() , and Pong() are three examplar processes	  that are to be run concurently.  Long() is a CPU intensive          job, while Ping() and Pong() bounce back between one another.	  5.    Wait() : busy wait for a key to be pressed  Simon Hawkin <cema@cs.umd.edu> 03/16/1998      - Added progress monitoring output in Long().  Jeff Hollingsworth <hollings@cs.umd.edu> 2/19/02      - Re-written for the new project  David Hovemeyer <daveho@cs.umd.edu> 2/27/04      - Update for GeekOS 0.2.0  [2] An enclosed test ("proc2.c", or "encl2.c").**********************************************************************/#include <conio.h>#include <process.h>#include <sched.h>#include <sema.h>#include <string.h>#if !defined (NULL)#define NULL 0#endifint main(int argc , char ** argv){  int policy = -1;  int start;  int elapsed;  int quantum;  int scr_sem;			/* sid of screen semaphore */  int id1, id2, id3;    	/* ID of child process */  if (argc == 3) {      if (!strcmp(argv[1], "rr")) {          policy = 0;      } else if (!strcmp(argv[1], "mlf")) {          policy = 1;      } else {	  Print("usage: %s [rr|mlf] <quantum>\n", argv[0]);	  Exit(1);      }      quantum = atoi(argv[2]);      Set_Scheduling_Policy(policy, quantum);  } else {      Print("usage: %s [rr|mlf] <quantum>\n", argv[0]);      Exit(1);  }  start = Get_Time_Of_Day();  scr_sem = Create_Semaphore ("screen" , 1)  ;  P (scr_sem) ;  Print ("************* Start Workload Generator *********\n");  V (scr_sem) ;  id1 = Spawn_Program ("/c/long.exe", "/c/long.exe"  ) ;  P (scr_sem) ;  Print ("Process Long has been created with ID = %d\n",id1);  V (scr_sem) ;  id2 = Spawn_Program ("/c/ping.exe", "/c/ping.exe"  ) ;  P (scr_sem) ;  Print ("Process Ping has been created with ID = %d\n",id2);  V (scr_sem) ;  id3 = Spawn_Program ("/c/pong.exe", "/c/pong.exe"  ) ;  P (scr_sem) ;  Print ("Process Pong has been created with ID = %d\n",id3);  V (scr_sem) ;  Wait(id1);  Wait(id2);  Wait(id3);  elapsed = Get_Time_Of_Day() - start;  Print ("\nTests Completed at %d\n", elapsed) ;  return 0;}