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📄 算法.txt

📁 银行家算法在vvc下的实现
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#include "malloc.h"
  #include "stdio.h"
  #include "stdlib.h"
  #define alloclen sizeof(struct allocation)
  #define maxlen sizeof(struct max)
  #define avalen sizeof(struct available)
  #define needlen sizeof(struct need)
  #define finilen sizeof(struct finish)
  #define pathlen sizeof(struct path)
  struct allocation
  {
  int value;
  struct allocation *next;
  };
  struct max
  {
  int value;
  struct max *next;
  };
  struct available /*可用资源数*/
  {
  int value;
  struct available *next;
  };
  struct need /*需求资源数*/
  {
  int value;
  struct need *next;
  };
  struct path
  {
  int value;
  struct path *next;
  };
  struct finish
  {
  int stat;
  struct finish *next;
  };
  int main()
  {
  int row,colum,status=0,i,j,t,temp,processtest;
  struct allocation *allochead,*alloc1,*alloc2,*alloctemp;
  struct max *maxhead,*maxium1,*maxium2,*maxtemp;
  struct available *avahead,*available1,*available2,*workhead,*work1,*work2,*worktemp,*worktemp1;
  struct need *needhead,*need1,*need2,*needtemp;
  struct finish *finihead,*finish1,*finish2,*finishtemp;
  struct path *pathhead,*path1,*path2;
  printf("\n请输入系统资源的种类数:");
  scanf("%d",&colum);
  printf("请输入现时内存中的进程数:");
  scanf("%d",&row);
  printf("请输入已分配资源矩阵:\n");
  for(i=0;i<row;i++)
  {
  for (j=0;j<colum;j++)
  {
  printf("请输入已分配给进程 p%d 的 %c 种系统资源:",i,'A'+j);
  if(status==0)
  {
  allochead=alloc1=alloc2=(struct allocation*)malloc(alloclen);
  alloc1->next=alloc2->next=NULL;
  scanf("%d",&allochead->value);
  status++;
  }
  else
  {
  alloc2=(struct allocation *)malloc(alloclen);
  scanf("%d,%d",&alloc2->value);
  if(status==1)
  {
  allochead->next=alloc2;
  status++;
  }
  alloc1->next=alloc2;
  alloc1=alloc2;
  }
  }
  }
  alloc2->next=NULL;
  status=0;
  printf("请输入最大需求矩阵:\n");
  for(i=0;i<row;i++)
  {
  for (j=0;j<colum;j++)
  {
  printf("请输入进程 p%d 种类 %c 系统资源最大需求:",i,'A'+j);
  if(status==0)
  {
  maxhead=maxium1=maxium2=(struct max*)malloc(maxlen);
  maxium1->next=maxium2->next=NULL;
  scanf("%d",&maxium1->value);
  status++;
  }
  else
  {
  maxium2=(struct max *)malloc(maxlen);
  scanf("%d,%d",&maxium2->value);
  if(status==1)
  {
  maxhead->next=maxium2;
  status++;
  }
  maxium1->next=maxium2;
  maxium1=maxium2;
  }
  }
  }
  maxium2->next=NULL;
  status=0;
  printf("请输入现时系统剩余的资源矩阵:\n");
  for (j=0;j<colum;j++)
  {
  printf("种类 %c 的系统资源剩余:",'A'+j);
  if(status==0)
  {
  avahead=available1=available2=(struct available*)malloc(avalen);
  workhead=work1=work2=(struct available*)malloc(avalen);
  available1->next=available2->next=NULL;
  work1->next=work2->next=NULL;
  scanf("%d",&available1->value);
  work1->value=available1->value;
  status++;
  }
  else
  {
  available2=(struct available*)malloc(avalen);
  work2=(struct available*)malloc(avalen);
  scanf("%d,%d",&available2->value);
  work2->value=available2->value;
  if(status==1)
  {
  avahead->next=available2;
  workhead->next=work2;
  status++;
  }
  available1->next=available2;
  available1=available2;
  work1->next=work2;
  work1=work2;
  }
  }
  available2->next=NULL;
  work2->next=NULL;
  status=0;
  alloctemp=allochead;
  maxtemp=maxhead;
  for(i=0;i<row;i++)
  for (j=0;j<colum;j++)
  {
  if(status==0)
  {
  needhead=need1=need2=(struct need*)malloc(needlen);
  need1->next=need2->next=NULL;
  need1->value=maxtemp->value-alloctemp->value;
  status++;
  }
  else
  {
  need2=(struct need *)malloc(needlen);
  need2->value=(maxtemp->value)-(alloctemp->value);
  if(status==1)
  {
  needhead->next=need2;
  status++;
  }
  need1->next=need2;
  need1=need2;
  }
  maxtemp=maxtemp->next;
  alloctemp=alloctemp->next;
  }
  need2->next=NULL;
  status=0;
  for(i=0;i<row;i++)
  {
  if(status==0)
  {
  finihead=finish1=finish2=(struct finish*)malloc(finilen);
  finish1->next=finish2->next=NULL;
  finish1->stat=0;
  status++;
  }
  else
  {
  finish2=(struct finish*)malloc(finilen);
  finish2->stat=0;
  if(status==1)
  {
  finihead->next=finish2;
  status++;
  }
  finish1->next=finish2;
  finish1=finish2;
  }
  }
  finish2->next=NULL; /*Initialization compleated*/
  status=0;
  processtest=0;
  for(temp=0;temp<row;temp++)
  {
  alloctemp=allochead;
  needtemp=needhead;
  finishtemp=finihead;
  worktemp=workhead;
  for(i=0;i<row;i++)
  {
  worktemp1=worktemp;
  if(finishtemp->stat==0)
  {
  for(j=0;j<colum;j++,needtemp=needtemp->next,worktemp=worktemp->next)
  if(needtemp->value<=worktemp->value)
  processtest++;
  if(processtest==colum)
  {
  for(j=0;j<colum;j++)
  {
  worktemp1->value+=alloctemp->value;
  worktemp1=worktemp1->next;
  alloctemp=alloctemp->next;
  }
  if(status==0)
  {
  pathhead=path1=path2=(struct path*)malloc(pathlen);
  path1->next=path2->next=NULL;
  path1->value=i;
  status++;
  }
  else
  {
  path2=(struct path*)malloc(pathlen);
  path2->value=i;
  if(status==1)
  {
  pathhead->next=path2;
  status++;
  }
  path1->next=path2;
  path1=path2;
  }
  finishtemp->stat=1;
  }
  else
  {
  for(t=0;t<colum;t++)
  alloctemp=alloctemp->next;
  finishtemp->stat=0;
  }
  }
  else
  for(t=0;t<colum;t++)
  {
  needtemp=needtemp->next;
  alloctemp=alloctemp->next;
  }
  processtest=0;
  worktemp=workhead;
  finishtemp=finishtemp->next;
  }
  }
  path2->next=NULL;
  finishtemp=finihead;
  for(temp=0;temp<row;temp++)
  {
  if(finishtemp->stat==0)
  {
  printf("\n系统处于非安全状态!\n");
  exit(0);
  }
  finishtemp=finishtemp->next;
  }
  printf("\n系统处于安全状态.\n");
  printf("\n安全序列为: \n");
  do
  {
  printf("p%d ",pathhead->value);
  }
  while(pathhead=pathhead->next);
  printf("\n");
  return 0;
  } 









#include "string.h" 
#include <stdio.h> 
#include <stdlib.h> 
#define M 5 
#define N 3 
#define FALSE 0 
#define TRUE 1 

/*M个进程对N类资源最大资源需求量*/ 
int MAX[M][N]={{7,5,3},{3,2,2},{9,0,2},{2,2,2},{4,3,3}}; 
/*系统可用资源数*/ 
int AVAILABLE[N]={10,5,7}; 
/*M个进程对N类资源最大资源需求量*/ 
int ALLOCATION[M][N]={{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,0}}; 
/*M个进程已经得到N类资源的资源量 */ 
int NEED[M][N]={{7,5,3},{3,2,2},{9,0,2},{2,2,2},{4,3,3}}; 
/*M个进程还需要N类资源的资源量*/ 
int Request[N]={0,0,0}; 


void main() 
{ 
int i=0,j=0; 
char flag='Y'; 
void showdata(); 
void changdata(int); 
void rstordata(int); 
int chkerr(int); 
showdata(); 
while(flag=='Y'||flag=='y') 
{ 
i=-1; 
while(i<0||i>=M) 
{ 
printf("请输入需申请资源的进程号(从0到"); 
printf("%d",M-1); 
printf(",否则重输入!):"); 
scanf("%d",&i); 
if(i<0||i>=M)printf("输入的进程号不存在,重新输入!\n"); 
} 
printf("请输入进程"); 
printf("%d",i); 
printf("申请的资源数\n"); 
for (j=0;j<N;j++) 
{ 
printf("资源"); 
printf("%d",j); 
printf(":"); 
scanf("%d",&Request[j]); 
if(Request[j]>NEED[i][j]) 
{ 
printf("进程"); 
printf("%d",i); 
printf("申请的资源数大于进程"); 
printf("%d",i); 
printf("还需要"); 
printf("%d",j); 
printf("类资源的资源量!申请不合理,出错!请重新选择!\n"); 
/*printf("申请不合理,出错!请重新选择!\n");*/ 
flag='N'; 
break; 
} 
else 
{ 
if(Request[j]>AVAILABLE[j]) 
{ 
printf("进程"); 
printf("%d",i); 
printf("申请的资源数大于系统可用"); 
printf("%d",j); 
printf("类资源的资源量!申请不合理,出错!请重新选择!\n"); 
/*printf("申请不合理,出错!请重新选择!\n");*/ 
flag='N'; 
break; 
} 
} 
} 
if(flag=='Y'||flag=='y') 
{ 
changdata(i); 
if(chkerr(i)) 
{ 
rstordata(i); 
showdata(); 
} 
else 
showdata(); 
} 
else 
showdata(); 
printf("\n"); 
printf("是否继续银行家算法演示,按'Y'或'y'键继续,按'N'或'n'键退出演示: "); 
scanf("%c",&flag); 
} 
} 

void showdata() 
{ 
int i,j; 
printf("系统可用的资源数为:\n"); 
printf(" "); 
for (j=0;j<N;j++){ 
printf(" 资源"); 
printf("%d",j); 
printf(":"); 
printf("%d",AVAILABLE[j]); 
/*printf("\n");*/ 
/* cout<<endl; 
// cout<<"各进程资源的最大需求量:"<<endl<<endl; 
// for (i=0;i<M;i++) 
// { 
// cout<<"进程"<<i<<":"; 
// for (j=0;j<N;j++)cout<<" 资源"<<j<<": "<<MAX[i][j]; 
// cout<<endl; 
*/ } 
printf("\n"); 
printf("各进程还需要的资源量:\n"); 
for (i=0;i<M;i++) 
{ 
printf(" 进程"); 
printf("%d",i); 
printf(":"); 
for (j=0;j<N;j++){ 
printf("资源"); 
printf("%d",j); 
printf(":"); 
printf("%d",NEED[i][j]); 
/*printf("\n");*/ 
} 
printf("\n"); 
} 
printf("各进程已经得到的资源量: \n"); 
for (i=0;i<M;i++) 
{ 
printf(" 进程"); 
printf("%d",i); 
/*printf(":\n");*/ 
for (j=0;j<N;j++){ 
printf("资源"); 
printf("%d",j); 
printf(":"); 
printf("%d",ALLOCATION[i][j]); 
/*printf("\n");*/ 
} 
printf("\n"); 
} 
} 

void changdata(int k) 
{ 
int j; 
for (j=0;j<N;j++) 
{ 
AVAILABLE[j]=AVAILABLE[j]-Request[j]; 
ALLOCATION[k][j]=ALLOCATION[k][j]+Request[j]; 
NEED[k][j]=NEED[k][j]-Request[j]; 
} 
}; 
void rstordata(int k) 
{ 
int j; 
for (j=0;j<N;j++) 
{ 
AVAILABLE[j]=AVAILABLE[j]+Request[j]; 
ALLOCATION[k][j]=ALLOCATION[k][j]-Request[j]; 
NEED[k][j]=NEED[k][j]+Request[j]; 
} 
}; 
int chkerr(int s) 
{ 
int WORK,FINISH[M],temp[M]; 
int i,j,k=0; 
for(i=0;i<M;i++)FINISH[i]=FALSE; 
for(j=0;j<N;j++) 
{ 
WORK=AVAILABLE[j]; 
i=s; 
while(i<M) 
{ 
if (FINISH[i]==FALSE&&NEED[i][j]<=WORK) 
{ 
WORK=WORK+ALLOCATION[i][j]; 
FINISH[i]=TRUE; 
temp[k]=i; 
k++; 
i=0; 
} 
else 
{ 
i++; 
} 
} 
for(i=0;i<M;i++) 
if(FINISH[i]==FALSE) 
{ 
printf("\n"); 
printf("系统不安全!!! 本次资源申请不成功!!!\n"); 
printf("\n"); 
return 1; 
} 
} 
printf("\n"); 
printf("经安全性检查,系统安全,本次分配成功。\n"); 
printf("\n"); 
printf(" 本次安全序列:"); 
for(i=0;i<M;i++){ 
printf("进程"); 
printf("%d",temp[i]); 
printf("->"); 
} 
printf("\n"); 
return 0; 
}

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