操作系统课程设计-莫黎(5)

block, finish };

struct pcb{ char name[4]; int priority; int cputime; int needtime; int count; int round; state process; pcb * next; };

pcb * get_process(); pcb * get_process(){ pcb *q; pcb *t; pcb *p; int i=0;

cout<<\

while (i

q=(struct pcb *)malloc(sizeof(pcb)); cin>>q->name; cin>>q->needtime; q->cputime=0;

q->priority=P_TIME-q->needtime; q->process=ready; q->next=NULL; if (i==0){ p=q;

t=q; } else{

t->next=q; t=q; } i++; } //while return p; }

void display(pcb *p){

cout<<\ \ \ \ while(p){

cout<name; cout<<\ \ cout<cputime; cout<<\ \ cout<needtime; cout<<\ \ cout<priority; cout<<\ \ switch(p->process){

case ready:cout<<\ case execute:cout<<\ case block:cout<<\ case finish:cout<<\ } p=p->next; }

\

}

int process_finish(pcb *q){ int bl=1; while(bl&&q){

bl=bl&&q->needtime==0; q=q->next; } return bl; }

void cpuexe(pcb *q){ pcb *t=q; int tp=0; while(q){

if (q->process!=finish){ q->process=ready; if(q->needtime==0){ q->process=finish; } }

if(tppriority&&q->process!=finish){ tp=q->priority; t=q; } q=q->next; }

if(t->needtime!=0){ t->priority-=3; t->needtime--; t->process=execute;

t->cputime++; } }

void priority_cal(){ pcb * p; p=get_process(); int cpu=0;

while(!process_finish(p)){ cpu++;

cout<<\ cpuexe(p); display(p); }

printf(\ getch(); }

void display_menu(){

cout<<\ cout<<\ cout<<\ cout<<\}

pcb * get_process_round(){ pcb *q; pcb *t; pcb *p; int i=0;

cout<<\

while (i

q=(struct pcb *)malloc(sizeof(pcb)); cin>>q->name; cin>>q->needtime; q->cputime=0; q->round=0; q->count=0; q->process=ready; q->next=NULL; if (i==0){ p=q; t=q; } else{

t->next=q; t=q; } i++; } //while return p; }

void cpu_round(pcb *q){ q->cputime+=2; q->needtime-=2; if(q->needtime<0) { q->needtime=0; }

q->count++; q->round++; q->process=execute;

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