system.h

本次实验的目的在于掌握使用nachos中的线程序解决较为复杂的并发问题。实验内容分三部分：实现事件栅栏原语并进行正确性测试；实现闹钟原语并进行正确性测试；利用事件栅栏和闹钟原语来解决电梯问题（详细内容

// 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