mos_io.cpp

用VC编写的一个微型操作系统

// Mos_io.cpp: implementation of the CMos_io class.
// Author:biti_zx  Released:March,2002.
// Copyright (c) By biti_zx 2002.
// All rights reserved.
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Mos.h"
#include "Mos_io.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CMos_io m_io;
extern PCB m_pcb;
extern CVCS m_cpu;
extern CMos_stor m_stor;
CMos_io::CMos_io()
{

}

CMos_io::~CMos_io()
{

}

void CMos_io::ioreq(int chno)
{
	CString str;
	iorbtype* iorb = new iorbtype;
	iorb->pcb = m_pcb.curr_pcb;
	m_pcb.curr_pcb->iorbp = iorb;
	mos_proc.sleep(chno);
	m_cpu.CHST[chno-1] = BUSY;
	m_UI.DealWithUI(_T("BUSY"),IDC_STATIC_KBS+chno-KB);
	if(CHHEAD[chno-1] == NULL)
	{
		CHHEAD[chno-1] = CHTAIL[chno-1] = iorb;
		iorb->link = NULL;
		if(chno < 3)
			m_cpu.CHCOUNT[chno-1] = 3;
		else m_cpu.CHCOUNT[chno-1] = 1;
		str.Format("%d",m_cpu.CHCOUNT[chno-1]);
		m_UI.DealWithUI(str,IDC_STATIC_IOKB-chno+KB);
	}
	else{
			CHTAIL[chno-1]->link = iorb;
			CHTAIL[chno-1] = CHTAIL[chno-1]->link;
			iorb->link = NULL;
	}
}

void CMos_io::wdsk(int n,char *buffer,int rec1,int &rec2)//返回－1为已经写完
{
	if(n>10||rec1>99||rec1<0||dsk==NULL) return;//错误情况
	m_UI.FillList(rec1,buffer,IDC_LIST2);
	fseek(dsk,rec1*sizeof(word)*10,SEEK_SET);//转到所要到的页
	fwrite(buffer,sizeof(word),n,dsk);//写入信息
	if(m_stor.DSKMTB[rec1].forwp==NULL)//写入的下一磁道
		rec2=-1;
	else
		rec2=(m_stor.DSKMTB[rec1].forwp)->index;
	m_cpu.io++;
	ioreq(IORESTDSK);
}

void CMos_io::wdsk(int n,char *buffer,int rec1)
{
	if(n>10||rec1>99||rec1<0||dsk==NULL) return;//错误情况
	m_UI.FillList(rec1,buffer,IDC_LIST2);
	fseek(dsk,rec1*sizeof(word)*10,SEEK_SET);//转到所要到的页
	fwrite(buffer,sizeof(word),n,dsk);//写入信息
	m_cpu.io++;
	ioreq(IORESTDSK);
}

void CMos_io::wprtln(char *buffer)
{
	if(print!=NULL)
	{
		fwrite(buffer,sizeof(char),strlen(buffer),print);
		fwrite("\n",sizeof(char),1,print);
		m_cpu.io++;
		ioreq(IORESTPRT);
	}
}

void CMos_io::rdsk(int n,char *buffer,int rec1,int &rec2)
{
	if(n>10||rec1>99||rec1<0||dsk==NULL) return;
	fseek(dsk,rec1*sizeof(word)*10,SEEK_SET);
	fread(buffer,sizeof(word),n,dsk);
	if(m_stor.DSKMTB[rec1].forwp==NULL)
		rec2=-1;
	else
		rec2=(m_stor.DSKMTB[rec1].forwp)->index;
	m_cpu.io++;
	ioreq(IORESTDSK);
}

void CMos_io::rkbln(char *buffer)
{
	if(kb!=NULL)
	{
		fgets(buffer,40,kb);
		int length=strlen(buffer)-1;//备用
		m_cpu.io++;
		ioreq(IORESTKB);
	}
}