与clook类似的算法

与CLOOK类似的磁盘调度算法是LOOK算法。

LOOK算法也是一种循环扫描算法，类似于CSCAN算法，但不是强制性地到达磁盘的另一端。它会根据请求队列中的磁道位置的分布情况，动态地改变移动方向。

具体工作流程如下：
1. 根据当前磁头位置和请求队列中的磁道位置，确定移动方向（向外或向内）。
2. 沿着移动方向扫描磁道，依次处理请求。
3. 如果扫描过程中没有请求，即请求队列为空，则停止扫描。
4. 如果到达请求队列中最边缘的磁道（最大或最小磁道），则改变移动方向。
5. 重复步骤2至步骤4，直到处理完所有的请求。

相比于CSCAN算法，LOOK算法不需要强制性地到达磁盘的另一端，可以根据实际情况更加高效地处理请求。

相关问题

用C语言编写Cscan算法、look调度算法、Clook调度算法

1. C语言实现Cscan算法：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define MAX 100

void sort(int n, int arr[]) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (arr[j] > arr[j + 1]) {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
}

int main() {
    int n, head, i, j, seek_time = 0, max, disk[MAX], left[MAX], right[MAX];

    printf("Enter the number of disk requests: ");
    scanf("%d", &n);

    printf("Enter the requests: ");
    for (i = 0; i < n; i++) {
        scanf("%d", &disk[i]);
    }

    printf("Enter the initial head position: ");
    scanf("%d", &head);

    // Divide the requests into left and right of the head
    int left_cnt = 0, right_cnt = 0;
    for (i = 0; i < n; i++) {
        if (disk[i] < head) {
            left[left_cnt++] = disk[i];
        } else {
            right[right_cnt++] = disk[i];
        }
    }

    // Sort the left and right requests in ascending order
    sort(left_cnt, left);
    sort(right_cnt, right);

    // Calculate seek time
    for (i = 0; i < 2; i++) {
        if (i == 0) {
            max = left[left_cnt - 1];
            for (j = left_cnt - 2; j >= 0; j--) {
                seek_time += abs(max - left[j]);
                max = left[j];
            }
            seek_time += max - 0;
        } else {
            max = right[0];
            for (j = 1; j < right_cnt; j++) {
                seek_time += abs(max - right[j]);
                max = right[j];
            }
            seek_time += 199 - max;
        }
    }

    printf("Total seek time: %d\n", seek_time);

    return 0;
}

2. C语言实现look调度算法：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define MAX 100

void sort(int n, int arr[]) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (arr[j] > arr[j + 1]) {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
}

int main() {
    int n, head, i, j, seek_time = 0, max, disk[MAX];

    printf("Enter the number of disk requests: ");
    scanf("%d", &n);

    printf("Enter the requests: ");
    for (i = 0; i < n; i++) {
        scanf("%d", &disk[i]);
    }

    printf("Enter the initial head position: ");
    scanf("%d", &head);

    // Sort the requests in ascending order
    sort(n, disk);

    // Find the index of the head position in the requests
    int index = 0;
    for (i = 0; i < n; i++) {
        if (disk[i] == head) {
            index = i;
            break;
        }
    }

    // Move the head from the initial position towards the end
    for (i = index; i < n - 1; i++) {
        seek_time += abs(disk[i + 1] - disk[i]);
    }

    // If there are requests after the head position, move the head to the last request
    if (index != n - 1) {
        seek_time += abs(disk[n - 1] - disk[index]);
    }

    // Move the head from the last request towards the beginning
    for (i = n - 1; i > 0; i--) {
        seek_time += abs(disk[i] - disk[i - 1]);
    }

    printf("Total seek time: %d\n", seek_time);

    return 0;
}

3. C语言实现Clook调度算法：

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

#define MAX 100

void sort(int n, int arr[]) {
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (arr[j] > arr[j + 1]) {
                int temp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }
    }
}

int main() {
    int n, head, i, j, seek_time = 0, max, disk[MAX], left[MAX], right[MAX];

    printf("Enter the number of disk requests: ");
    scanf("%d", &n);

    printf("Enter the requests: ");
    for (i = 0; i < n; i++) {
        scanf("%d", &disk[i]);
    }

    printf("Enter the initial head position: ");
    scanf("%d", &head);

    // Divide the requests into left and right of the head
    int left_cnt = 0, right_cnt = 0;
    for (i = 0; i < n; i++) {
        if (disk[i] < head) {
            left[left_cnt++] = disk[i];
        } else {
            right[right_cnt++] = disk[i];
        }
    }

    // Sort the left and right requests in ascending order
    sort(left_cnt, left);
    sort(right_cnt, right);

    // Calculate seek time
    max = right[0];
    for (i = 1; i < right_cnt; i++) {
        seek_time += abs(max - right[i]);
        max = right[i];
    }
    seek_time += abs(max - left[0]);
    max = left[0];
    for (i = 1; i < left_cnt; i++) {
        seek_time += abs(max - left[i]);
        max = left[i];
    }

    printf("Total seek time: %d\n", seek_time);

    return 0;
}

用C语言编写一个包含scan算法、Cscan算法、look调度算法、Clook调度算法的程序

好的，下面是一个包含scan算法、Cscan算法、look调度算法、Clook调度算法的C语言程序的示例：

#include <stdio.h>
#include <stdlib.h>

#define MAX 1000

void scan(int queue[], int head, int size){
    int distance = 0;
    int current = head;
    for(int i = 0; i < size; i++){
        if(queue[i] >= current){
            distance += queue[i] - current;
            current = queue[i];
        }
    }
    printf("SCAN Algorithm:\nTotal Head Movement = %d\n", distance);
}

void cscan(int queue[], int head, int size){
    int distance = 0;
    int current = head;
    int max = MAX - 1;
    for(int i = 0; i < size; i++){
        if(queue[i] >= current){
            distance += queue[i] - current;
            current = queue[i];
        }
    }
    distance += max - current;
    current = 0;
    for(int i = 0; i < size; i++){
        if(queue[i] >= current){
            distance += queue[i] - current;
            current = queue[i];
        }
    }
    printf("CSCAN Algorithm:\nTotal Head Movement = %d\n", distance);
}

void look(int queue[], int head, int size){
    int distance = 0;
    int current = head;
    int max = MAX - 1;
    for(int i = 0; i < size; i++){
        if(queue[i] >= current){
            distance += queue[i] - current;
            current = queue[i];
        }
    }
    for(int i = size - 1; i >= 0; i--){
        if(queue[i] < current){
            distance += current - queue[i];
            current = queue[i];
        }
    }
    printf("LOOK Algorithm:\nTotal Head Movement = %d\n", distance);
}

void clook(int queue[], int head, int size){
    int distance = 0;
    int current = head;
    for(int i = 0; i < size; i++){
        if(queue[i] >= current){
            distance += queue[i] - current;
            current = queue[i];
        }
    }
    for(int i = size - 1; i >= 0; i--){
        if(queue[i] < current){
            distance += current - queue[i];
            current = queue[i];
        }
    }
    printf("CLOOK Algorithm:\nTotal Head Movement = %d\n", distance);
}

int main(){
    int queue[] = {98, 183, 37, 122, 14, 124, 65, 67};
    int size = sizeof(queue) / sizeof(queue[0]);
    int head = 53;
    scan(queue, head, size);
    cscan(queue, head, size);
    look(queue, head, size);
    clook(queue, head, size);
    return 0;
}

这个程序中，我定义了四个函数：`scan()`、`cscan()`、`look()`、`clook()`，分别对应SCAN算法、CSCAN算法、LOOK算法和CLOOK算法。这些函数接收一个整数数组表示磁盘访问队列、一个整数表示磁头的起始位置、一个整数表示队列的长度。函数中实现了对应算法，并打印出总的磁头移动距离。

在`main()`函数中，我定义了一个整数数组表示磁盘访问队列，一个整数表示磁头的起始位置，然后分别调用四个函数计算总的磁头移动距离，并打印出来。

这只是一个简单的示例程序，你可以根据自己的需求进行修改和扩展。