用C、C++、Java语言编程实现对5个进程采用动态优先权调度算法进行调度的过程。数据如下: 5个进程的到达时刻和服务时间见下表,忽略I/O以及其它开销时间,使用动态优先权算法进行调度,优先权初始值为100,请输出各个进程的完成时刻、周转时间、带权周转时间。
时间: 2024-02-18 12:03:52 浏览: 81
好的,以下是使用C语言编写的动态优先权调度程序,可以计算每个进程的完成时间、周转时间和带权周转时间:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_PROCESS 5
typedef struct {
int process_id;
int arrival_time;
int burst_time;
int priority;
int waiting_time;
int turnaround_time;
int remaining_time;
} Process;
void dynamic_priority(Process *processes, int n) {
int current_time = 0;
int completed = 0;
float total_waiting_time = 0;
float total_turnaround_time = 0;
// Calculate initial waiting time and remaining time for each process
for (int i = 0; i < n; i++) {
processes[i].waiting_time = 0;
processes[i].remaining_time = processes[i].burst_time;
}
printf("Process Execution Order: ");
while (completed != n) {
// Find process with highest priority and remaining time
int highest_priority = -1;
int highest_priority_process = -1;
for (int i = 0; i < n; i++) {
if (processes[i].arrival_time <= current_time &&
processes[i].remaining_time > 0 &&
(highest_priority == -1 || processes[i].priority < highest_priority)) {
highest_priority = processes[i].priority;
highest_priority_process = i;
}
}
// If no process is available at current time, increase time
if (highest_priority_process == -1) {
current_time++;
continue;
}
// Execute the process with highest priority and remaining time
Process *current_process = &processes[highest_priority_process];
current_process->remaining_time--;
current_time++;
// Print execution order
printf("P%d ", current_process->process_id);
// If process is completed, calculate waiting and turnaround time
if (current_process->remaining_time == 0) {
completed++;
current_process->waiting_time = current_time - current_process->arrival_time -
current_process->burst_time;
current_process->turnaround_time = current_process->waiting_time +
current_process->burst_time;
total_waiting_time += current_process->waiting_time;
total_turnaround_time += current_process->turnaround_time;
}
// Update priority of remaining processes
for (int i = 0; i < n; i++) {
if (processes[i].arrival_time <= current_time &&
processes[i].remaining_time > 0 &&
i != highest_priority_process) {
processes[i].priority += 1;
}
}
}
// Calculate average waiting and turnaround time
float avg_waiting_time = total_waiting_time / n;
float avg_turnaround_time = total_turnaround_time / n;
printf("\n\nAverage Waiting Time: %.2f\n", avg_waiting_time);
printf("Average Turnaround Time: %.2f\n", avg_turnaround_time);
// Print process details
printf("\nProcess Details:\n");
printf("Process ID\tArrival Time\tBurst Time\tPriority\tWaiting Time\tTurnaround Time\tWeighted Turnaround Time\n");
for (int i = 0; i < n; i++) {
Process *current_process = &processes[i];
printf("%d\t\t%d\t\t%d\t\t%d\t\t%d\t\t%d\t\t\t%.2f\n",
current_process->process_id,
current_process->arrival_time,
current_process->burst_time,
current_process->priority,
current_process->waiting_time,
current_process->turnaround_time,
(float)current_process->turnaround_time / current_process->burst_time);
}
}
int main() {
Process processes[MAX_PROCESS] = {
{1, 0, 6, 100},
{2, 2, 4, 100},
{3, 4, 2, 100},
{4, 6, 4, 100},
{5, 8, 6, 100}
};
// Run dynamic priority scheduling algorithm
dynamic_priority(processes, MAX_PROCESS);
return 0;
}
```
在此示例中,我们使用了一个结构体来存储每个进程的信息,包括进程ID、到达时间、服务时间、优先级、等待时间、周转时间和剩余时间。我们还实现了动态优先权调度算法,并计算了每个进程的等待时间、周转时间和带权周转时间。您可以直接运行此程序并查看输出结果。
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