pcb.h

用VC编写的一个微型操作系统

// PCB.h: interface for the PCB class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_PCB_H__28D33ED1_7D0C_492D_915B_4230FB64975A__INCLUDED_)
#define AFX_PCB_H__28D33ED1_7D0C_492D_915B_4230FB64975A__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
const int PCBMAX = 8;
#include "JCB.h"
struct pcbtype;
struct iorbtype
{
	pcbtype *pcb;
	iorbtype *link;
};
struct pcbtype
{
	int  pid;//proc ID
	int  mode;//user|kernel
	int  flag;//ready|run|sleep
	int  step;//for system proc
	char regpc[2];//PC
	char regc;//C
	char regr[4];//R
	char regptr[4];//PTR
	int  cputime;//record proc time
	int  io;//io times
	int  errn;//record error
	iorbtype* iorbp;//link to iorb
	int  outp;//track No. for output
	int  olimit;//max out
	int  resultline;
	int  inp;//track No.for input
	int  ilimit;//max in
	jcbtype *jcb;
	pcbtype *next;
};
class PCB  
{
public:
	PCB();
	virtual ~PCB();
public:
	pcbtype  PcbTab[PCBMAX];
	pcbtype* curr_pcb;//当前进程
	pcbtype* readypcbhead;//就绪队列
	pcbtype* readypcbtail;
	pcbtype* waitpcb_head;//等PCB    P2
	pcbtype* waitmem_head;//等memory P1
	pcbtype* waitout_head;//等输出   P3
	pcbtype* waitjcb_head;//等JCB表  P2
	pcbtype* jcbnull_head;//等作业   P2
	pcbtype* kbend_head;//等提交作业 P1
	pcbtype* restkb_head;
	pcbtype* restdsk_head;
	pcbtype* restprt_head;
	pcbtype* restkb_tail;
	pcbtype* restdsk_tail;
	pcbtype* restprt_tail;
	pcbtype* dsk_head;
	pcbtype* dsk_tail;
	pcbtype* pcb_free_head;
	pcbtype* pcb_free_tail;
	int      free_pcb_count;
};
#endif // !defined(AFX_PCB_H__28D33ED1_7D0C_492D_915B_4230FB64975A__INCLUDED_)