代码2.cpp

一个很好的银行家算法

#include<iostream.h>
#include<fstream.h>
#include<stdlib.h>
#include "windows.h"
#define MAX_PROCESS 32                 //最大进程数
#define MAX_COURCE 64                   //最大资源类别
int MAX_FACT_PROCESS;                    //实际总进程数
int MAX_FACT_COURCE;                     //实际资源类别数
int Available[MAX_COURCE];                 //可利用资源向量
int Max[MAX_PROCESS][MAX_COURCE];          //最大需求矩阵
int Allocation[MAX_PROCESS][MAX_COURCE];   //分配矩阵
int Need[MAX_PROCESS][MAX_COURCE];         //需求矩阵
int Request_PROCESS;                       //发出请求的进程
int Request_COURCE;                        //被请求资源类别
int Request_COURCE_NEMBER;                 //请求资源数
struct COMP{
int value;
int num;
int next;
};
int flag=0;
void Read_Initiate(void){                             //读入初始化文档
ifstream infile("Initiate.txt");
   if(!infile){
cout<<"不能打开输入文件:"<<"Initiate.txt"<<'\n';
exit(1);
}
cout<<"开始读入初始化文档"<<'\n';
int ch;
int Array[MAX_PROCESS*MAX_COURCE*2];
int num=0;
while(infile>>ch)
    Array[num++]=ch;
num=0;
   MAX_FACT_COURCE=Array[num++];
   for(int j=0;j<MAX_FACT_COURCE;j++)
Available[j]=Array[num++];
   MAX_FACT_PROCESS=Array[num++];
for(int i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
Max[i][j]=Array[num++];
}
infile.close();
}
void Write_Initiate(void){                                  //写入初始化文档(分配资源
ofstream outfile("Initiate.txt");
if(!outfile){
cout<<"不能打开初始化文档："<<'\n';
exit(1);
}
int Array[MAX_PROCESS*MAX_COURCE*2];
int num=0;
Array[num++]=MAX_FACT_COURCE;
   for(int i=0;i<MAX_FACT_COURCE;i++)
Array[num++]=Available[i];
Array[num++]=MAX_FACT_PROCESS;
for(i=0;i<MAX_FACT_PROCESS;i++)
for(int j=0;j<MAX_FACT_COURCE;j++)
Array[num++]=Max[i][j];
num=0;
outfile<<Array[num++]<<" ";
for(i=0;i<MAX_FACT_COURCE;i++)
outfile<<Array[num++]<<" ";
outfile<<'\n'<<Array[num++]<<endl;
for(i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
outfile<<Array[num++]<<" ";
outfile<<endl;
}
DWORD m_delay=3000;
Sleep(m_delay);
outfile.close();
cout<<"修改初始化文档成功!"<<endl;
}
void Allocated_list(void){                         //读入已分配资源列表
ifstream infile("Allocated_list.txt");
   if(!infile){
cout<<"不能打开输入文件:"<<"Allocated_list.txt"<<'\n';
exit(1);
}
cout<<"开始读入已分配资源列表"<<'\n';
int ch,num=0;
int Array[MAX_PROCESS*MAX_COURCE];
while(infile>>ch)
Array[num++]=ch;
num=0;
for(int i=0;i<MAX_FACT_PROCESS;i++)
for(int j=0;j<MAX_FACT_COURCE;j++)
Allocation[i][j]=Array[num++];
infile.close();
}
void Set_Need(void){                        //设置需求矩阵
cout<<"设置需求矩阵"<<'\n';
for(int i=0;i<MAX_FACT_PROCESS;i++)
for(int j=0;j<MAX_FACT_COURCE;j++)
Need[i][j]=Max[i][j]-Allocation[i][j];
}
void Read_Request(void){                           //读入请求向量
ifstream infile("Request_list.txt");
   if(!infile){
cout<<"不能打开输入文件:"<<"Request_list.txt"<<'\n';
exit(1);
}
   cout<<"开始读入请求向量"<<'\n';
int Array[3];
int num=0,ch;
while(infile>>ch)
    Array[num++]=ch;
   Request_PROCESS=Array[0];
   Request_COURCE=Array[1];
   Request_COURCE_NEMBER=Array[2];
infile.close();
}
void Write_Allocation(void){                         //修改资源分配列表(资源分配)
ofstream outfile("Allocated_list.txt");
if(!outfile){
cout<<"不能打开资源分配列表："<<'\n';
exit(1);
}
for(int i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
outfile<<Allocation[i][j]<<" ";
outfile<<endl;
}
   DWORD m_delay=3000;
Sleep(m_delay);
cout<<"修改资源分配列表成功!"<<endl;
outfile.close();
}
void Allocate_Source(void){                       //开始分配(已通过扫描和安全性检测)
cout<<'\n'<<"开始给第"<<Request_PROCESS<<"个进程分配第"<<Request_COURCE
<<"类资源"<<Request_COURCE_NEMBER<<"个"<<endl;
Write_Initiate();
Write_Allocation();
DWORD m_delay=3000;
Sleep(m_delay);
cout<<'\n'<<"祝贺您，资源分配已成功!"<<endl;
}
void Test_Safty(){                         //安全性检测
cout<<'\n'<<"进入安全性检测!"<<endl;
   int Work[MAX_COURCE];
for(int i=0;i<MAX_FACT_COURCE;i++){
Work[i]=Available[i];
}
   bool Finish[MAX_PROCESS][MAX_COURCE];
for(i=0;i<MAX_FACT_PROCESS;i++)
for(int j=0;j<MAX_FACT_COURCE;j++)
Finish[i][j]=false;
COMP Array[32];
for(i=0;i<MAX_FACT_PROCESS;i++)
{
Array[i].value=Need[i][Request_COURCE-1];
       Array[i].num=i;
}
for(i=0;i<MAX_FACT_PROCESS;i++)
for(int j=i+1;j<MAX_FACT_PROCESS;j++){
if(Array[i].value>=Array[j].value){
int t;
t=Array[j].value;
               Array[j].value=Array[i].value;
Array[i].value=t;
t=Array[j].num;
               Array[j].num=Array[i].num;
               Array[i].num=t;
}
else continue;
}
DWORD m_delay=3000;
Sleep(m_delay);
/*for(i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
cout<<Need[i][j]<<'\t';
cout<<endl;
}
*/
if(Finish[Request_PROCESS-1][Request_COURCE-1]==false&&Need[Request_PROCESS-1][Request_COURCE-1]<=Work[Request_COURCE-1])
{
Work[Request_COURCE-1]=Work[Request_COURCE-1]+Allocation[Request_PROCESS-1][Request_COURCE-1];
       Finish[Request_PROCESS-1][Request_COURCE-1]=true;
}
else
{
cout<<"未通过安全性测试，不与以分配"<<endl;
exit(0);
}
   for(i=0;i<MAX_FACT_PROCESS;i++){
if(Array[i].num==Request_PROCESS-1)
continue;
if(Array[i].num!=Request_PROCESS-1&&Finish[Array[i].num][Request_COURCE-1]==false&&Need[Array[i].num][Request_COURCE-1]<=Work[Request_COURCE-1]){
Work[Request_COURCE-1]=Work[Request_COURCE-1]+Allocation[Array[i].num][Request_COURCE-1];
               Finish[Array[i].num][Request_COURCE-1]=true;
}
}
   for(i=0;i<MAX_FACT_PROCESS;i++)
{
if(Finish[i][Request_COURCE-1]==true)
continue;
else
{
cout<<"未通过安全性测试，不与以分配"<<endl;
   exit(0);
}
}
cout<<'\n'<<"找到一个安全序列:"<<"P"<<Request_PROCESS<<"--->";
   for(i=0;i<MAX_FACT_PROCESS;i++){
if(Array[i].num==Request_PROCESS)
continue;
else
cout<<"P"<<Array[i].num<<"--->";
}
cout<<'\n'<<"已通过安全性测试!"<<endl;
Allocate_Source();
}
void RUN(void){                                        //执行银行家算法
   cout<<"*************************************************"<<'\n'<<"点击1执行!"
<<'\n'<<"点击2退出!"
<<'\n'<<"*************************************************"<<endl;
cin>>flag;
if(flag==2)
exit(0);
if(flag==1)
{
cout<<"开始扫描请求信息!"<<endl;
DWORD m_delay=3000;
Sleep(m_delay);
if(Request_COURCE_NEMBER>Need[Request_PROCESS-1][Request_COURCE-1])
{
cout<<'\n'<<"第"<<Request_PROCESS<<"个进程请求第"<<Request_COURCE<<"类资源"<<Request_COURCE_NEMBER<<"个"<<endl;
       cout<<"可是已超出该进程尚需的该类资源的最大数量,所以不予以分配!!"<<endl;
exit(0);
}
if(Request_COURCE_NEMBER>Available[Request_COURCE-1])
{
cout<<'\n'<<"第"<<Request_PROCESS<<"个进程请求第"<<Request_COURCE<<"类资源"<<Request_COURCE_NEMBER<<"个"<<endl;
       cout<<"可是系统中尚无足够的资源,所以进入等待队列!!"<<endl;
exit(0);
}
   else{
Available[Request_COURCE-1]=Available[Request_COURCE-1]-Request_COURCE_NEMBER;
       Allocation[Request_PROCESS-1][Request_COURCE-1]=Allocation[Request_PROCESS-1][Request_COURCE-1]+Request_COURCE_NEMBER;
       Need[Request_PROCESS-1][Request_COURCE-1]=Need[Request_PROCESS-1][Request_COURCE-1]-Request_COURCE_NEMBER;
cout<<"扫描通过"<<endl;
Sleep(m_delay);
Test_Safty();
}
}
else {
cout<<"输入错误,请重新输入!"<<'\n';
RUN();
}
}
 
void main(void){
   Read_Initiate();
cout<<MAX_FACT_COURCE<<'\t';
for(int i=0;i<MAX_FACT_COURCE;i++)
cout<<Available[i]<<'\t';
cout<<endl<<MAX_FACT_PROCESS<<endl;
for(i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
cout<<Max[i][j]<<'\t';
cout<<endl;
}
DWORD m_delay=3000;
Sleep(m_delay);
cout<<"读入成功"<<'\n';
Allocated_list();
for(i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
cout<<Allocation[i][j]<<'\t';
cout<<endl;
}
Sleep(m_delay);
cout<<"读入成功"<<'\n';
Set_Need();
   for(i=0;i<MAX_FACT_PROCESS;i++){
for(int j=0;j<MAX_FACT_COURCE;j++)
cout<<Need[i][j]<<'\t';
cout<<endl;
}
   Sleep(m_delay);
cout<<"设置成功"<<'\n';
   Read_Request();
cout<<'\n'<<"第"<<Request_PROCESS<<"个进程请求第"<<Request_COURCE<<"类资源"<<Request_COURCE_NEMBER<<"个"<<endl;
cout<<'\n'<<"读入成功"<<'\n';
RUN();
}