优先级调度算法如何用JAVA实现

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#include time.h

#include dos.h

#include math.h

#include conio.h

#include stdio.h

#include stdlib.h

#include time.h

#include graphics.h

#define ESC 0x1b

#define ENTER 0x0d

#define TRUE 1

#define FALSE 0

/*每隔TIME秒就变换一次优先级*/

#define TIME 5

/*数据结构*/

/****************************************************************/

enum _Status/*进程状态枚举*/

{

READY =0,/*就绪*/

RUN,/*执行中*/

SUSPEND,/*挂起*/

};

typedef enum _Status Status;

/****************************************************************/

struct _Pcb/*进程结构*/

{

int PID;/*进程ID，ID为负数的进程为系统后备队列的作业*/

int Time;/*进程运行需要的时间*/

int Prior;/*进程的优先级，越大越优先*/

Status Sts;/*状态*/

struct _Pcb *Next;/*指向本进程队列中下个进程的PCB*/

};

typedef struct _Pcb PCB;

/****************************************************************/

struct _Batch/*多道处理中的道结构*/

{

PCB *pcb;/*该道当前正在处理的进程*/

struct _Batch *Next;/*下一道*/

};

typedef struct _Batch Batch;

/****************************************************************/

/*多道系统相关全局变量*/

PCB *ProcQueue = NULL;/*进程链表，按优先级从大到小排列*/

Batch *BatchQueue = NULL;/*系统多道链表*/

/****************************************************************/

/*动态优先权抢占式调度算法及相关函数声明*/

/****************************************************************/

int InitBatchs(int n);/*初始化多道系统，n为道数*/

int InsertProc(int prior, int time);/*向进程链表中按优先级大小插入一个新进程*/

int InsertIDLE();/*向进程队列中加入后备进程，当系统空闲时将被调入*/

int SortProcQueue();/*将进程链表按优先级从大到小排列*/

int AddBatch();/*增加系统道数*/

int DeleteBatch();/*减少系统道数*/

int UnSuspendProc(int id);/*解除ID为id的进程的挂起状态*/

int UpdateBatchs();/*多道系统根据进程链表进行更新，并将执行完毕的进程删除*/

int PassSeconds(int n);/*系统经过n秒后计算数据并进行优先级调度*/

/****************************************************************/

/*各函数的定义*/

/****************************************************************/

int InitBatchs(int n)

{

int i;

for (i=0; in; ++i)

{

AddBatch();

}

return (UpdateBatchs());

}

int InsertProc(int prior, int time)

{

static int sysid = 0;/*该系统已经加入过多少进程，此值将是新进程的ID*/

PCB *last,*now,*pcb;

pcb = (PCB*)malloc(sizeof(PCB));

if (pcb == NULL) return FALSE;

pcb-Prior = prior;

pcb-Time = time;

pcb-PID = (++sysid);

pcb-Sts = READY;

if (ProcQueue == NULL)/*如果进程队列为空*/

{

ProcQueue = pcb;

pcb-Next = NULL;

return TRUE;

}

last = ProcQueue;

now = last-Next;

if (pcb-Prior last-Prior)/*pcb将排在队头*/

{

pcb-Next = ProcQueue;

ProcQueue = pcb;

return TRUE;

}

while ((now != NULL) (pcb-Prior now-Prior))/*寻找插入位置*/

{

last = now;

now = last-Next;

}

last-Next = pcb;

pcb-Next = now;

return TRUE;

}

int InsertIDLE()

{

PCB *now = ProcQueue;

PCB *idle = (PCB*)malloc(sizeof(PCB));

if (idle == NULL) return FALSE;

idle-PID = -1;

idle-Prior = -1;

idle-Sts = SUSPEND;

idle-Time = -1;

idle-Next = NULL;

if (ProcQueue == NULL)

{

ProcQueue = idle;

return TRUE;

}

while(now-Next != NULL)

{

now = now-Next;

}

now-Next = idle;

return TRUE;

}

int SortProcQueue()

{ /*冒泡排序*/

PCB *last, *now;

int b = FALSE;/*上次遍历是否无交换产生*/

if (ProcQueue==NULL || ProcQueue-Next==NULL)/*如果链表中无进程或只有一个进程*/

return FALSE;

while (!b)

{

b = TRUE;

last=ProcQueue;

now=last-Next;

if (last-Prior now-Prior)

{

ProcQueue = now;

last-Next = now-Next;

now-Next = last;

b = FALSE;

last = ProcQueue;

now = last-Next;

}

while (now-Next!=NULL)

{

if ((now-Prior)(now-Next-Prior))

{

last-Next = now-Next;

now-Next = now-Next-Next;

last-Next-Next = now;

b = FALSE;

}

else

last = last-Next;

now = last-Next;

}

}

return TRUE;

}

int AddBatch()

{

Batch *bt = (Batch*)malloc(sizeof(Batch));

if (bt==NULL) return FALSE;

bt-Next = BatchQueue;

BatchQueue = bt;

bt-pcb = NULL;

return (InsertIDLE());

}

int DeleteBatch()

{

Batch *bt = BatchQueue;

PCB *last, *now;

if (BatchQueue==NULL || BatchQueue-Next==NULL)/*如果只剩最后一道则不删除*/

return FALSE;

if (ProcQueue==NULL || ProcQueue-Next==NULL)/*如果只有最后一个后备空闲进程*/

return FALSE;/**/

last = ProcQueue;

now = last-Next;

while (now-Next != NULL)/*查找到最后一个进程，该进程必定是后备空闲进程*/

{

last = now;

now = last-Next;

}

if (now==NULL || now-PID=0)/*未查找到后备进程*/

return FALSE;/**/

free(now);

last-Next = NULL;

BatchQueue = BatchQueue-Next;

free(bt);

return TRUE;

}

int UnSuspendProc(int id)

{

PCB *now = ProcQueue;

if (ProcQueue==NULL) return FALSE;

while (now != NULL)

{

if (now-PID == id)

{

now-Sts = READY;

return TRUE;

}

}

return FALSE;

}

int UpdateBatchs()

{

Batch *bt = BatchQueue;

PCB *last = ProcQueue, *now;

while (bt != NULL)

{

bt-pcb = NULL;

bt = bt-Next;

}

if (ProcQueue == NULL) return TRUE;

while (last-Sts==RUN last-PID=0 last-Time=0)

{

ProcQueue = ProcQueue-Next;

free(last);

last = ProcQueue;

}

now = last-Next;

while (now != NULL)

{

if (now-Sts==RUN now-PID=0 now-Time=0)/*如果该进程是运行中的一般进程并已执行完毕*/

{

last-Next = now-Next;

free(now);

}

else

last = last-Next;

now = last-Next;

}

bt = BatchQueue;

now = ProcQueue;

while (bt != NULL now != NULL)

{

bt-pcb = now;

now-Sts = RUN;

bt = bt-Next;

now = now-Next;

}

while (now != NULL)

{

if (now-Sts == RUN)

{

now-Sts = SUSPEND;

}

now = now-Next;

}

return TRUE;

}

int PassSeconds(int n)

{

static int time = 0;

int i=0, ProcEnd = FALSE;

PCB *pcb = ProcQueue;

Batch *bt = BatchQueue;

if (bt == NULL) return FALSE;

time += n;

if (time=TIME)

{

i = time/TIME;/*经过多少时间段*/

time = time%TIME;

}

while (bt != NULL)/*更新进程运行时间*/

{

if (bt-pcb-PID=0)

{

bt-pcb-Time -= n;

if (bt-pcb-Time = 0)/*进程结束*/

{

ProcEnd = TRUE;

}

}

bt = bt-Next;

}

if (i 0)

{

while (pcb != NULL)/*更新进程优先权（动态优先权）*/

{

if (pcb-Sts == RUN pcb-PID=0)/*运行的进程优先权降低*/

{

pcb-Prior -= i;

if (pcb-Prior 0)

pcb-Prior = 0;

}

else if (pcb-Sts == SUSPEND pcb-PID=0)/*挂起的进程优先权升高*/

pcb-Prior += i;

pcb = pcb-Next;

}

}

if (i0)

SortProcQueue();/*如果优先级有变动则重新排序*/

if (ProcEnd || i0)

{

UpdateBatchs();/*更新多道进程*/

}

return TRUE;

}

/****************************************************************/

/*图形界面相关函数*/

/****************************************************************/

/*表格的单位宽度和高度*/

#define WIDTH 64

#define HEIGHT 12

void *black=NULL;/*背景色方格，使用它擦出表格中的图形*/

int InitGraph()/*初始化图形界面*/

{

int GraphDriver; /* The Graphics device driver */

int GraphMode; /* The Graphics mode value */

int ErrorCode;

GraphDriver = DETECT; /* Request auto-detection */

initgraph( GraphDriver, GraphMode, "" );

ErrorCode = graphresult(); /* Read result of initialization*/

if( ErrorCode != grOk )

{ /* Error occured during init */

printf(" Graphics System Error: %s\n", grapherrormsg( ErrorCode ) );

getch();

return FALSE;

}

cleardevice();

black = (void*)malloc(imagesize(1,1,WIDTH-1,HEIGHT-1));

getimage(1,1,WIDTH-1,HEIGHT-1,black);

DrawFrame();

DrawData();

return TRUE;

}

int DrawFrame()/*画边框和表头*/

{

settextjustify(CENTER_TEXT, CENTER_TEXT);

gprintf(320, HEIGHT/2-1, "Multi-Batch System Emulation");

settextjustify(LEFT_TEXT, TOP_TEXT);

moveto(0,HEIGHT);

lineto(0,479);

lineto(639,479);

lineto(639,HEIGHT);

lineto(0,HEIGHT);

line(WIDTH*4,HEIGHT,WIDTH*4,479);

line(WIDTH*7,HEIGHT,WIDTH*7,479);

line(0,HEIGHT*2,639,HEIGHT*2);

line(0,HEIGHT*3,639,HEIGHT*3);

gprintf(HEIGHT*0+2,HEIGHT*1+2,"System Batchs");/*系统多道列表头*/

gprintf(HEIGHT*0+2,HEIGHT*2+2,"Batch");

gprintf(WIDTH*1+2,HEIGHT*2+2,"ProcID");

gprintf(WIDTH*2+2,HEIGHT*2+2,"Time");

gprintf(WIDTH*3+2,HEIGHT*2+2,"Prior");

gprintf(WIDTH*4+2,HEIGHT*1+2,"Suspended Processes");/*挂起队列列表头*/

gprintf(WIDTH*4+2,HEIGHT*2+2,"ProcID");

gprintf(WIDTH*5+2,HEIGHT*2+2,"Time");

gprintf(WIDTH*6+2,HEIGHT*2+2,"Prior");

gprintf(WIDTH*7+2,HEIGHT*1+2,"Ready Processes");/*就绪队列列表头*/

gprintf(WIDTH*7+2,HEIGHT*2+2,"ProcID");

gprintf(WIDTH*8+2,HEIGHT*2+2,"Time");

gprintf(WIDTH*9+2,HEIGHT*2+2,"Prior");

}

int DrawData()/*绘制系统数据*/

{

int numRun=0, numSus=0, numRed=0;/*运行挂起和就绪的进程各有多少*/

PCB* now = ProcQueue;

int x=0, y=0;

while (now != NULL)

{

switch(now-Sts)

{

case RUN:

x = WIDTH*1;

y = HEIGHT*(3+(numRun++));

break;

case SUSPEND:

x = WIDTH*4;

y = HEIGHT*(3+(numSus++));

break;

case READY:

x = WIDTH*7;

y = HEIGHT*(3+(numRed++));

break;

}

if (now-Sts==RUN)/*该进程为正在运行的进程*/

{

putimage(x-WIDTH+1,y+1,black,COPY_PUT);

gprintf(x-WIDTH+2,y+2,"%d",numRun);

}

if (now-PID=0)/*该进程不是后备进程*/

{

putimage(x+1,y+1,black,COPY_PUT);

gprintf(x+2,y+2,"%d",now-PID);

putimage(x+1+WIDTH,y+1,black,COPY_PUT);

gprintf(x+WIDTH+2,y+2,"%d",now-Time);

putimage(x+1+WIDTH*2,y+1,black,COPY_PUT);

gprintf(x+WIDTH*2+2,y+2,"%d",now-Prior);

}

else

{

putimage(x+1,y+1,black,COPY_PUT);

putimage(x+1+WIDTH,y+1,black,COPY_PUT);

putimage(x+1+WIDTH*2,y+1,black,COPY_PUT);

gprintf(x+2,y+2,"system idle process");

}

now = now-Next;

}

}

int DlgGetNum(char *buf,int l,int t,int r,int b,int gettime)

{

char ch;

int pos=0;

bar(l,t,r,b);

gprintf(l+10,t+5,"Add new Process");

if (gettime)

gprintf(l+10,t+20,"input the time:");

else

gprintf(l+10,t+20,"input the priority:");

while (1)

{

ch = getch();

if (ch == ENTER)/*如果输入了回车键*/

{

if(pos!=0)/*如果位置不在第一位(回车键不准第一个输入)*/

{

buf[pos]='\0';

break;

}

}

else if (ch='0' ch='9')

{

buf[pos++]=ch;

buf[pos]='\0';

}

else if (ch == ESC)

{

return FALSE;

}

else/*其他按键均按BackSpace处理*/

{

--pos;

buf[pos]='\0';

}

if (pos0)

{ pos=0; buf[pos]='\0';}

else if (pos4)/*最多输入4位数*/

{ pos=4; buf[pos]='\0';}

bar(l,t+35,r,t+47);

gprintf(l+50,t+35,buf);

}

return TRUE;

}

int NewProcDlg()

{

int l=200,t=150,r=380,b=200,pos=0,prior=0,time=0;

char buf[5],ch;

PCB *pcb;

void* bg = (void*)malloc(imagesize(l,t,r,b));

getimage(l,t,r,b,bg);

setfillstyle(1,2);

flushall();

/*******输入优先级**********/

if (!DlgGetNum(buf,l,t,r,b,FALSE))

goto exit;

prior = atoi(buf);

/*******输入时间**********/

pos=0;

buf[pos]='\0';

if (!DlgGetNum(buf,l,t,r,b,TRUE))

goto exit;

time = atoi(buf);

InsertProc(prior, time);

exit:

putimage(l,t,bg,COPY_PUT);

free(bg);

return TRUE;

}

int gprintf( int xloc, int yloc, char *fmt, ... )/*图形系统中的格式输出*/

{

va_list argptr; /* Argument list pointer */

char str[140]; /* Buffer to build sting into */

int cnt; /* Result of SPRINTF for return */

va_start( argptr, format ); /* Initialize va_ functions */

cnt = vsprintf( str, fmt, argptr ); /* prints string to buffer */

outtextxy( xloc, yloc, str ); /* Send string in graphics mode */

va_end( argptr ); /* Close va_ functions */

return( cnt ); /* Return the conversion count */

}

/****************************************************************/

/*main函数*/

int main()

{

clock_t start=0, end=0;

char kb;

InitBatchs(3);/*初始化为3道系统*/

InitGraph();

while (1)

{

start = end = clock();

while (!kbhit())

{

start = clock();

if ((start-end)/18.2 = 1)/*时间过了一秒*/

{

start = end = clock();

PassSeconds(1);

cleardevice();

DrawFrame();

DrawData();

}

}

kb = getch();

switch (kb)

{

case ESC:

closegraph();

return 0;

case 'w':

AddBatch();

UpdateBatchs();

cleardevice();

DrawFrame();

DrawData();

break;

case 's':

DeleteBatch();

UpdateBatchs();

cleardevice();

DrawFrame();

DrawData();

break;

case 'i':

NewProcDlg();

UpdateBatchs();

DrawFrame();

DrawData();

break;

}

}

return 0;

}

进程调度算法模拟程序设计

public class PrivilegeProcess {

public static void main(String[] args) {

MyQueue myqueue = new MyQueue();//声明队列

PCB[] pcb = {new PCB(001,8,1),new PCB(002,7,9),new PCB(003,3,8),new PCB(004,1,7),new PCB(005,7,4)};

PCB para = new PCB();

for(int i=0;ipcb.length;i++){//初始化后首先执行一次排序，这里使用的是选择排序，优先级高的先入队

for(int j=i;jpcb.length;j++){

if(pcb[i].privilege pcb[j].privilege){

para = pcb[i];

pcb[i] = pcb[j];

pcb[j] = para;

}

}

}

System.out.println("初次入队后各进程的顺序：");

for(int i=0;ipcb.length;i++){

System.out.println("初次入队后 # processname : " + pcb[i].name + " totaltime : " + pcb[i].totaltime + " privilege :" + pcb[i].privilege);

}

System.out.println();

myqueue.start(pcb);

}

}

class MyQueue {

int index = 0;

PCB[] pc = new PCB[5];

PCB[] pc1 = new PCB[4];

PCB temp = new PCB();

public void enQueue(PCB process){//入队算法

if(index==5){

System.out.println("out of bounds !");

return;

}

pc[index] = process;

index++;

}

public PCB deQueue(){//出队算法

if(index==0)

return null;

for(int i=0;ipc1.length;i++){

pc1[i] = pc[i+1];

}

index--;

temp = pc[0];

for(int i=0;ipc1.length;i++){

pc[i] = pc1[i];

}

return temp;

}

public void start(PCB[] pc){//显示进程表算法

while(pc[0].isNotFinish==true||pc[1].isNotFinish==true||pc[2].isNotFinish==true||pc[3].isNotFinish==true||pc[4].isNotFinish==true){

//*注意：||运算符，所有表达式都为false结果才为false,否则为true

for(int i=0;ipc.length;i++){

pc[i].run(this);

}

System.out.println();

for(int i=0;ipc.length;i++){//所有进程每执行完一次时间片长度的运行就重新按优先级排列一次

for(int j=i;jpc.length;j++){

if(pc[i].privilege pc[j].privilege){

temp = pc[i];

pc[i] = pc[j];

pc[j] = temp;

}

}

}

}

}

}

class PCB {//声明进程类

int name,totaltime,runtime,privilege;

boolean isNotFinish;

public PCB(){

}

public PCB(int name, int totaltime, int privilege){

this.name = name;//进程名

this.totaltime = totaltime;//总时间

this.privilege = privilege;//优先级别

this.runtime = 2;//时间片，这里设值为2

this.isNotFinish = true;//是否执行完毕

System.out.println("初始值： processname : " + name + " totaltime : " + totaltime + " privilege :" + privilege );

System.out.println();

}

public void run (MyQueue mq){//进程的基于时间片的执行算法

if(totaltime1){

totaltime-=runtime;//在总时间大于1的时候，总时间=总时间-时间片

privilege--;

System.out.println(" processname : " + name + " remaintime : " + totaltime + " privilege :" + privilege );

}else if(totaltime==1){

totaltime--;//在总时间为1时，执行时间为1

privilege--;

System.out.println(" processname : " + name + " remaintime : " + totaltime + " privilege :" + privilege );

}else{

isNotFinish = false;//总时间为0，将isNotFinish标记置为false

}

if(isNotFinish==true){

mq.deQueue();

mq.enQueue(this);

}

}

}

用c语言或者Java设计出一个任务调度器。。。

公众:类PrivilegeProcess {

公共静态无效的主要(字串[] args){

MyQueue的MyQueue的新MyQueue的();/ /声明队列

印刷电路板[PCB = {新的PCB(001 ，8,1)，新的PCB(002,7,9)，新的PCB(003,3,8)，新的PCB(004,1,7)，新的PCB(005,7,4)};

PCB段=新的PCB();

(INT I = 0; pcb.length; + +){/ /初始化先进行排序，选择排序这里使用的是高优先级的一线队

(J =我; pcb.length; J + +){

(PCB [I]。特权PCB [J]。特权){

段= PCB [1];

PCB [I] = PCB [J];

PCB [J] =段;

}

}

}

体系。通过out.println(“入队后第一时间的进程的顺序:”);

(INT I = 0; pcb.length; + +){

的System.out调用println(第一次入队#程序名称:“+ PCB [我]。名称+ totaltime:”+ PCB [I]。totaltime +“的”特权“+ PCB [我]。特权); }

();

myqueue.start(PCB);

}

}

类MyQueue的{

INT指数= 0;

PCB [] PC =新的PCB [5];

PCB [] PC1 =新的PCB [4];

PCB温度=新的PCB() BR /公共无效排队(PCB工艺){/ /排队算法

(指数== 5){

(“出界!”);

返回

}

PC [索引] =进程;

指数+ +;

}

公共:PCB DEQUEUE(){/ /出队算法(索引== 0)

返回空;

(INT I = 0; pc1.length; + +){

PC1 [I] = PC [ +1];

}

指数 -

温度= PC [0];

(INT I = 0; pc1.length; + +){ BR / PC [I] = PC1 [I];

}

回报条件;

}

公共无效启动(PCB [] PC){/ /进程表算法

(PC [0]。isNotFinish ==真| | PC [1 isNotFinish ==真| | PC [2 isNotFinish ==真| | PC [3]。时isNotFinish ==真| | PC [4]。isNotFinish ==){

/ / *注:| |运算符都是假的，所有的表达式结果为假，否则真

(INT I = 0; PC长度; + +){

PC [I]。运行(这一点); /} 的System.out.println();

(INT I = 0; pc.length; + +){/ /处理每个运行一次运行的时间片的长度重新排序优先一旦

(J =我; pc.length; J + +){

如果(PC [I]特权PC [J]。特权){

温度= PC [I];

PC [I] = PC [J];

PC [J] =温度;

}

}

}

}

}

}

类PCB {/ /声明过程级

和int名，totaltime ，运行时特权;

布尔isNotFinish的;

公众PCB(){

}

公开PCB(名称，诠释totaltime特权){

this.name =的名称;/ /进程名

this.totaltime = totaltime ;/ /

this.privilege =特权;/ /总时间优先 this.runtime = 2 ;/ /时间片值是2

this.isNotFinish =真;/ /是否执行完成

(“初始值:程序名称:”+名+“totaltime:”+ totaltime +“特权”+特权);

System.out的。调用println();

}

MyQueue的MQ公共无效的run(){/ /处理的基础上实施的时间片算法

(totalTime 1){ totaltime =运行;/ /总时间大于1，总时间=总时间 - 时间片

特权 -

(“程序名称:”+姓名+“ remaintime:“+ +”特权“+特权); totaltime

的} else if(totaltime == 1){

totaltime - ;/ /总时间为1时，执行时间为1

特权 -

(“程序名称:”+姓名+“remaintime:”+ totaltime +“特权”+特权);

}其他{

isNotFinish =假;/ / 0，将isNotFinish标志设置为假

}

如果(isNotFinish ==真){br mq.deQueue(); mq.enQueue(本); }

}

}

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