# round robin Loop.... help plz

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Ayda il 23 Apr 2012
Modificato: Walter Roberson il 11 Mag 2018
Good morning\evening ppl =)
i wrote a code for round robin algorithm i had a small problem in the loop and i don't know how to fix it
my code
clc
numOfJobs=5
CPUTime=[10 6 2 4 8]
CPUTime_copy=CPUTime;
CPUTime_copy2=CPUTime;
quantum=1;
totalCPUtime= sum(CPUTime)
total_temp=totalCPUtime;
complete_RR=[];
start=[];
wait=[];
while (totalCPUtime ~= 0)
for i=1:1:numOfJobs
if CPUTime(i)>0
if(CPUTime(i)>quantum)
CPUTime(i)=CPUTime(i)-1;
total_temp=total_temp-1;
else
CPUTime(i)=CPUTime(i)-1;
total_temp=total_temp-1;
complete_RR(i)=totalCPUtime-total_temp;
end
end
start(i)=i;
wait(i)=totalCPUtime-total_temp-CPUTime_copy(i);
end
end
start
wait
complete_RR
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### Risposta accettata

Richard Brown il 23 Apr 2012
You're never updating totalCPUtime so your while loop never exits
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Ayda il 24 Apr 2012
thanxs
i should do this while (total_temp ~= 0)

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### Più risposte (1)

Jamal Nasir il 11 Mag 2018
Modificato: Walter Roberson il 11 Mag 2018
%%%this code for Calculate Average waiting Time in Round Robin and Average Turn around Time
%%%%by Jamal Nasir %%%%University of Almustansiryah %%%Iraq
clc
clear all
j=3;
job=randperm(10,j);
jobi=job;
flag=job>0;
Quant=2;
tw=sum(job);
job1=[];
x=1:j;
x1=[];
n=0;
f1=[];
while tw>0
n=n+1;
job1=[job1,job];
for i=1:j
if flag(i)>0
if job(i)>Quant
job(i)=job(i)-Quant;
else
job(i)=0;
flag(i)=0;
end
end
end
tw=sum(job);
x1=[x1,x];
f1=[f1,flag];
end
k=length(f1);
for m=1:j
to=0;wt=0;
for i=1:k
if x1(i)~=m
if job1(i)>=Quant
t=Quant;
else
t=job1(i);
end
wt=wt+t;
else
if job1(i)>=Quant
t1=Quant;
else
t1=job1(i);
end
if t1<job1(i)
to=to+t1;
else
break;
end
end
end
wait(m)=wt;
end
AvWaitTime=mean(wait)
AvTurnAroundTime=mean(wait+jobi)
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