先來先服務(wù)調(diào)度算法

1、FCFS先來先服務(wù)調(diào)度算法:#include#include#include#include#define MAX_POSSIBILITY 100 using namespace std;typedef struct PCBint sum;int PID;char Pname;bool state;int arrive_time;int start_time;int serve_time;int finish_time;創(chuàng)建進程PCB/頭結(jié)點用于存放進程的總個數(shù)進程號進程名進程運行狀態(tài)/進程到達時間進程開始時間進場服務(wù)時間進程完成時間float turn_around_time; /進程周轉(zhuǎn)時

2、間float weight_turn_around_time; 進程帶權(quán)周轉(zhuǎn)時間 PCB *next;PCB;void InitHead(PCB *p)(PCB *q = p;q-PID=-1;q-Pname=-1;q-state=false;q-arrive_time=0;/指向下一個進程/ true代表未被執(zhí)行初始化到達時間q-serve_time=0;隨機產(chǎn)生進程服務(wù)時間q-start_time=0;有待于計算的時間q-finish_time=0;q-turn_around_time=0;q-weight_turn_around_time=0;q-next=NULL;void Creat

3、ePCB(PCB *p)隨機創(chuàng)建進程int N,pid=0,arrive_time=0;char pname=A;cinN;創(chuàng)建的進程數(shù)PCB *head=p;head-sum=N;srand( (unsigned)time( NULL );設(shè)置隨機數(shù)種子while(N-)PCB *q=(PCB *)malloc(sizeof(PCB);q-PID=pid;q-Pname=pname;q-state=true;/ true 代表未被執(zhí)行q-arrive_time=arrive_time;初始化到達時間q-serve_time=rand() % MAX_POSSIBILITY; /隨機產(chǎn)生進程服

4、務(wù)時間q-start_time=0;有待于計算的時間q-finish_time=0;q-turn_around_time=0;q-weight_turn_around_time=0;q-next=NULL;head-next=q;head=head-next;pid+;pname+;arrive_time+;void Run_FCFS(PCB *p)PCB *head=p;head-state=false;表示已經(jīng)執(zhí)行while(head-start_timearrive_time)head-start_time+;head-finish_time=head-start_time+head-s

5、erve_time;完成時間=開始時間+服務(wù)時間 head-turn_around_time=head-finish_time-head-arrive_time;/凋 轉(zhuǎn)時間=完成-到達 head-weight_turn_around_time=head-turn_around_time/head-serve_time;if(head-next)head-next-start_time=head-finish_time; /下一個進程開始=這個進程的完成 cout進程號進程名運行狀態(tài)到達時間服務(wù)時間開始時間完成時間周轉(zhuǎn)時間帶權(quán)周轉(zhuǎn)時間endl;cout PIDt Pnamet statet arrive_timet serve_timet start_timet finish_timetturn_around_timetweight_turn_around_timetnnext; while(head) if(head-state) Run_FCFS(head); head=head-next; void main() PCB *