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// system.h  
//  All global variables used in Nachos are defined here. 
// 
// Copyright (c) 1992-1993 The Regents of the University of California. 
// All rights reserved.  See copyright.h for copyright notice and limitation  
// of liability and disclaimer of warranty provisions. 
 
#ifndef SYSTEM_H 
#define SYSTEM_H 
 
#include "copyright.h" 
#include "utility.h" 
#include "thread.h" 
#include "scheduler.h" 
#include "interrupt.h" 
#include "stats.h" 
#include "timer.h" 
#include "Alarm.h" 
 
 
 
// Initialization and cleanup routines 
extern void Initialize(int argc, char **argv);  // Initialization, 
                        // called before anything else 
extern void Cleanup();              // Cleanup, called when 
                        // Nachos is done. 
 
extern Thread *currentThread;           // the thread holding the CPU 
extern Thread *threadToBeDestroyed;         // the thread that just finished 
extern Scheduler *scheduler;            // the ready list 
extern Interrupt *interrupt;            // interrupt status 
extern Statistics *stats;           // performance metrics 
extern Timer *timer;                // the hardware alarm clock 
extern Alarm *alarmclock; 
 
#ifdef USER_PROGRAM 
#include "machine.h" 
extern Machine* machine;    // user program memory and registers 
#endif 
 
#ifdef FILESYS_NEEDED       // FILESYS or FILESYS_STUB  
#include "filesys.h" 
extern FileSystem  *fileSystem; 
#endif 
 
#ifdef FILESYS 
#include "synchdisk.h" 
extern SynchDisk   *synchDisk; 
#endif 
 
#ifdef NETWORK 
#include "post.h" 
extern PostOffice* postOffice; 
#endif 
 
#endif // SYSTEM_H