int Program::exec()
{
std::vector<unsigned int> positions;
Random rand;
for (unsigned long r = ReadsCount_; r > 0; r--)
positions.push_back(rand.next(1, Config_.getInt("Head", "MaxPos", 1) - 1));
DS_.add(positions);
Disk fcfs(Config_.getInt("Head", "InitPos", 1));
Disk sstf(Config_.getInt("Head", "InitPos", 1));
Disk scan(Config_.getInt("Head", "InitPos", 1));
CSCANDisk cscan(Config_.getInt("Head", "InitPos", 1), Config_.getInt("Head", "MaxPos", 1));
std::cout << "FCFS \t\t SSTF \t\t SCAN \t\t CSCAN" << std::endl;
do
{
fcfs.setNextPosition(DS_.popFCFS());
sstf.setNextPosition(DS_.popSSTF());
scan.setNextPosition(DS_.popSCAN());
cscan.setNextPosition(DS_.popCSCAN());
std::string str = "";
str += fcfs.toString() + " \t ";
str += sstf.toString() + " \t ";
str += scan.toString() + " \t ";
str += cscan.toString();
std::cout << str << std::endl;
Log_.out(str);
}
while (!DS_.done());
std::cin.get();
return 0;
}
void choice()
{
clrscr();
i=nor;
movt=0;
int ch;
cout<<"1.FCFS\n2.SSTF\n3.SCAN\n4.LOOK\n5.CSCAN\n6.CLOOK\n7.Exit\nEnter Choice : ";
cin>>ch;
switch(ch)
{
case 1:fcfs();
break;
case 2:sstf();
break;
case 3:scan();
break;
case 4:look();
break;
case 5:cscan();
break;
case 6:clook();
break;
default:exit(1);
}
}
int main()
{
input();
printf("%d\n\n\n",clook());
printf("%d\n\n\n",cscan());
printf("%d\n\n\n",fcfs());
printf("%d\n\n\n",look());
printf("%d\n\n\n",scan());
printf("%d\n\n\n",sstf());
return 0;
}
void main()
{
printf("Enter The no. of tasks per cylinder :");
scanf("%d",&task);
printf("Enter the current head position: ");
scanf("%d",&hand);
for(i=0;i<task;i++)
{
printf("Enter the track no. %d: ",(i+1));
scanf("%d",&track[i][0]);
}
//fcfs();
cscan();
}
IO_PAIR mmu_NRU::locate_event()
{
IO_PAIR temp;
if(mmutype=='f')
{
temp=*readylist.begin();
readylist.erase(readylist.begin());
return temp;
}
else if(mmutype=='s')
{
vector<IO_PAIR>::iterator it=readylist.begin();
for (it = readylist.begin() ; it != readylist.end(); ++it)
{
it->priority=abs(it->track_number-current_position);
}
sort(readylist.begin(),readylist.end(),my_priority);
temp=*readylist.begin();
readylist.erase(readylist.begin());
return temp;
}
else if(mmutype=='S')
{
if(direction==true)
{
temp=up();
return temp;
}
else
{
temp=down();
return temp;
}
}
else if(mmutype=='C')
{
temp=cscan();
return temp;
}
else
{
printf("prameter error! Please check the parameter for -s option\n");
exit(0);
}
}
int setup_scheduler(const char* input_file, const char* scheduler, int sec_to_sec_seek, int end_to_end_seek){
char** tokens = read_input(input_file);
int len = array_len(tokens);
access_data* data[len];
char* tok;
char* line;
int i = 0;
while (i < len){
line = tokens[i];
tok = strtok(line," ");
int arrival_time = atoi((const char*)tok);
tok = strtok(NULL," ");
int sector = atoi((const char*)tok);
access_data* a = malloc(sizeof(access_data));
new_data(a, arrival_time, sector);
data[i] = a;
i++;
}
//show_data(data, len);
if (strcmp(scheduler, "FCFS") == 0){
fcfs(data, len, sec_to_sec_seek);
}
else if (strcmp(scheduler, "SSTN") == 0){
sstn(data, len, sec_to_sec_seek);
}
else if (strcmp(scheduler, "SCAN") == 0){
scan(data, len, sec_to_sec_seek);
}
else if (strcmp(scheduler, "CSCAN") == 0){
cscan(data, len, sec_to_sec_seek);
}
else{
fprintf(stderr, "%s\n","Invalid scheduling algorithm.");
exit(EXIT_FAILURE);
}
free_access_data(data, len);
free(tokens);
return 0;
}
/*
**policy_handler select the corresponding function to handle the request sequence
**@ncylinder is the total number of cylinders
**@ipolicy is the index if policy
**@ifile is the file pointer to the input_file
**@result is a pointer to dynamic array for store execute sequence and their travel_num
**@travel is the total travel number
*/
void policy_handler(int ncylinder, int ipolicy, FILE *ifile, int **result, int *travel)
{
int *list = NULL;
init_sequence(ncylinder, ifile, &list);
init_result(result);
item *sorted = NULL;
int first = list[0];
//sort the request according to there distance to the head of disk
if (ipolicy == 2 || ipolicy == 3 || ipolicy == 4)
sorted = sort(ncylinder, list);
if (ipolicy == 1)
*travel = fcfs(ncylinder, list, *result);
else if (ipolicy == 2)
*travel = sstf(first, sorted, *result);
else if (ipolicy == 3)
*travel = cscan(ncylinder, first, sorted, *result);
else if (ipolicy == 4)
*travel = look(ncylinder, first, sorted, *result);
}