用c语言实现处理机调度

处理机调度是指操作系统利用处理机资源，按照一定的规则和策略，将任务分配给不同的进程或线程，以达到高效利用处理机资源的目的。在C语言中，可以使用调度算法来进行处理机调度。常用的调度算法包括先来先服务 (FCFS)、短作业优先 (SJF)、轮转法 (RR)等。实现这些算法的思路是，通过设置进程的优先级、长度、到达时间等参数，对待执行的进程进行排序和调度，然后将处理机资源分配给能够获得优先权的进程。具体的实现方法需要根据算法的不同，了解进程管理、线程同步等相关知识。

相关问题

处理机调度c语言

处理机调度是操作系统中的一个重要功能，其作用是决定在何时执行哪个进程。C语言可以用来实现处理机调度算法。以下是一个简单的处理机调度程序实现，使用了Round Robin算法。

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

#define MAX 1000

struct Process {
    int pid;
    int burst_time;
    int remaining_time;
    int arrival_time;
};

int main() {
    int n, quantum_time;
    struct Process p[MAX];
    int waiting_time[MAX], turnaround_time[MAX];
    int total_waiting_time = 0, total_turnaround_time = 0, total_burst_time = 0;
    int i, j, time = 0;

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

    printf("Enter time quantum: ");
    scanf("%d", &quantum_time);

    for(i = 0; i < n; i++) {
        p[i].pid = i+1;
        printf("Enter burst time for process %d: ", i+1);
        scanf("%d", &p[i].burst_time);
        p[i].remaining_time = p[i].burst_time;
        printf("Enter arrival time for process %d: ", i+1);
        scanf("%d", &p[i].arrival_time);
        total_burst_time += p[i].burst_time;
    }

    while(total_burst_time > 0) {
        for(i = 0; i < n; i++) {
            if(p[i].remaining_time == 0) continue;
            if(p[i].remaining_time > quantum_time) {
                p[i].remaining_time -= quantum_time;
                total_burst_time -= quantum_time;
                time += quantum_time;
            } else {
                total_burst_time -= p[i].remaining_time;
                time += p[i].remaining_time;
                p[i].remaining_time = 0;
                turnaround_time[i] = time - p[i].arrival_time;
                waiting_time[i] = turnaround_time[i] - p[i].burst_time;
                total_waiting_time += waiting_time[i];
                total_turnaround_time += turnaround_time[i];
            }
        }
    }

    printf("\nPID\tBurst Time\tArrival Time\tWaiting Time\tTurnaround Time\n");
    for(i = 0; i < n; i++) {
        printf("%d\t%d\t\t%d\t\t%d\t\t%d\n", p[i].pid, p[i].burst_time, p[i].arrival_time, waiting_time[i], turnaround_time[i]);
    }

    printf("\nAverage waiting time: %.2f", (float)total_waiting_time/n);
    printf("\nAverage turnaround time: %.2f", (float)total_turnaround_time/n);

    return 0;
}

在此程序中，用户输入了进程的数量和时间片大小，然后输入每个进程的到达时间和执行时间。程序根据Round Robin算法执行，并计算出每个进程的等待时间和周转时间。最后，程序打印出每个进程的执行数据和平均等待时间和周转时间。

用c语言的时间片转轮调度算法实现单处理机系统的进程调度

以下是使用C语言实现时间片转轮调度算法的单处理机系统进程调度的示例代码：

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

#define MAX_PROCESSES 10
#define TIME_QUANTUM 4

struct process {
    int pid;
    int arrival_time;
    int burst_time;
    int remaining_time;
    int waiting_time;
    int turnaround_time;
};

int n;
struct process processes[MAX_PROCESSES];

void read_processes() {
    printf("Enter the number of processes: ");
    scanf("%d", &n);

    for (int i = 0; i < n; i++) {
        printf("Enter arrival time and burst time of process %d: ", i+1);
        scanf("%d%d", &processes[i].arrival_time, &processes[i].burst_time);
        processes[i].pid = i+1;
        processes[i].remaining_time = processes[i].burst_time;
    }
}

void print_processes() {
    printf("Process\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n");
    for (int i = 0; i < n; i++) {
        printf("%d\t%d\t\t%d\t\t%d\t\t%d\n", processes[i].pid, processes[i].arrival_time,
               processes[i].burst_time, processes[i].waiting_time, processes[i].turnaround_time);
    }
}

void schedule_processes() {
    int current_time = 0;
    int completed_processes = 0;

    while (completed_processes < n) {
        for (int i = 0; i < n; i++) {
            if (processes[i].arrival_time <= current_time && processes[i].remaining_time > 0) {
                int remaining_time = processes[i].remaining_time;
                if (remaining_time > TIME_QUANTUM) {
                    remaining_time = TIME_QUANTUM;
                }
                current_time += remaining_time;
                processes[i].remaining_time -= remaining_time;

                if (processes[i].remaining_time == 0) {
                    processes[i].waiting_time = current_time - processes[i].arrival_time - processes[i].burst_time;
                    processes[i].turnaround_time = current_time - processes[i].arrival_time;
                    completed_processes++;
                }
            }
        }
    }
}

int main() {
    read_processes();
    schedule_processes();
    print_processes();
    return 0;
}

该代码首先读取用户输入的进程数量和每个进程的到达时间和执行时间。然后，它使用时间片转轮调度算法来调度进程，并计算每个进程的等待时间和周转时间。最后，它打印出所有进程的详细信息，包括它们的到达时间、执行时间、等待时间和周转时间。