modified and updated
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44e766514e
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6 changed files with 674 additions and 7 deletions
234
OS/C/Week11/qq1.c
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234
OS/C/Week11/qq1.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <limits.h>
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void sstf(int requests[], int n, int head) {
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int total_seek = 0;
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int completed = 0;
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int visited[100] = {0};
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int current = head;
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printf("\nSSTF Disk Scheduling\n");
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printf("Seek Sequence: %d", head);
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while (completed < n) {
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int min_distance = INT_MAX;
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int min_index = -1;
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for (int i = 0; i < n; i++) {
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if (!visited[i]) {
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int distance = abs(requests[i] - current);
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if (distance < min_distance) {
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min_distance = distance;
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min_index = i;
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}
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}
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}
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visited[min_index] = 1;
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current = requests[min_index];
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total_seek += min_distance;
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completed++;
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printf(" -> %d", current);
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}
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printf("\nTotal Seek Time: %d\n", total_seek);
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}
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void scan(int requests[], int n, int head, int disk_size) {
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int total_seek = 0;
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int direction = 1; // 1 for moving right, 0 for moving left
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int current = head;
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printf("\nSCAN Disk Scheduling\n");
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printf("Seek Sequence: %d", head);
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// Sort requests
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for (int i = 0; i < n; i++) {
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for (int j = 0; j < n - i - 1; j++) {
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if (requests[j] > requests[j + 1]) {
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int temp = requests[j];
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requests[j] = requests[j + 1];
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requests[j + 1] = temp;
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}
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}
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}
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// Find position of head in sorted array
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int index;
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for (index = 0; index < n; index++) {
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if (requests[index] >= head)
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break;
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}
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// Move right
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for (int i = index; i < n; i++) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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// Move to the end of disk
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printf(" -> %d", disk_size - 1);
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total_seek += abs(disk_size - 1 - head);
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head = disk_size - 1;
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// Move left
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for (int i = index - 1; i >= 0; i--) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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printf("\nTotal Seek Time: %d\n", total_seek);
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}
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void cscan(int requests[], int n, int head, int disk_size) {
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int total_seek = 0;
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int current = head;
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printf("\nC-SCAN Disk Scheduling\n");
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printf("Seek Sequence: %d", head);
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// Sort requests
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for (int i = 0; i < n; i++) {
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for (int j = 0; j < n - i - 1; j++) {
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if (requests[j] > requests[j + 1]) {
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int temp = requests[j];
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requests[j] = requests[j + 1];
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requests[j + 1] = temp;
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}
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}
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}
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// Find position of head in sorted array
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int index;
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for (index = 0; index < n; index++) {
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if (requests[index] >= head)
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break;
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}
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// Move right
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for (int i = index; i < n; i++) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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// Move to the end of disk
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printf(" -> %d", disk_size - 1);
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total_seek += abs(disk_size - 1 - head);
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// Move to the beginning
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printf(" -> 0");
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total_seek += disk_size - 1;
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head = 0;
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// Move right again
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for (int i = 0; i < index; i++) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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printf("\nTotal Seek Time: %d\n", total_seek);
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}
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void clook(int requests[], int n, int head) {
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int total_seek = 0;
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int current = head;
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printf("\nC-LOOK Disk Scheduling\n");
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printf("Seek Sequence: %d", head);
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// Sort requests
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for (int i = 0; i < n; i++) {
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for (int j = 0; j < n - i - 1; j++) {
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if (requests[j] > requests[j + 1]) {
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int temp = requests[j];
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requests[j] = requests[j + 1];
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requests[j + 1] = temp;
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}
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}
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}
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// Find position of head in sorted array
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int index;
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for (index = 0; index < n; index++) {
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if (requests[index] >= head)
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break;
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}
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// Move right
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for (int i = index; i < n; i++) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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// Move to first request
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for (int i = 0; i < index; i++) {
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current = requests[i];
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printf(" -> %d", current);
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total_seek += abs(current - head);
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head = current;
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}
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printf("\nTotal Seek Time: %d\n", total_seek);
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}
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int main() {
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int requests[100], n, head, disk_size, choice;
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printf("Enter the number of disk requests: ");
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scanf("%d", &n);
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printf("Enter the disk requests: ");
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for (int i = 0; i < n; i++) {
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scanf("%d", &requests[i]);
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}
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printf("Enter the initial head position: ");
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scanf("%d", &head);
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printf("Enter the disk size (0 to size-1): ");
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scanf("%d", &disk_size);
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do {
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printf("\n\nDisk Scheduling Algorithms\n");
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printf("1. SSTF (Shortest Seek Time First)\n");
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printf("2. SCAN\n");
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printf("3. C-SCAN\n");
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printf("4. C-LOOK\n");
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printf("5. Exit\n");
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printf("Enter your choice: ");
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scanf("%d", &choice);
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switch (choice) {
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case 1:
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sstf(requests, n, head);
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break;
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case 2:
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scan(requests, n, head, disk_size);
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break;
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case 3:
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cscan(requests, n, head, disk_size);
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break;
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case 4:
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clook(requests, n, head);
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break;
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case 5:
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printf("Exiting program...\n");
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break;
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default:
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printf("Invalid choice!\n");
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}
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} while (choice != 5);
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return 0;
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}
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