390 lines
11 KiB
C++
390 lines
11 KiB
C++
#include <iostream>
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#include <fstream>
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#include <cstring>
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#include <unistd.h>
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#include <chrono>
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#include <sstream>
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#include <string>
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#include <bits/stdc++.h>
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using namespace std;
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struct process_detail {
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//cpu_burst_times[0] is arrival time
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int pid;
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vector<int> burst_times;
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int in_cpu1;
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int in_cpu2;
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int current_burst_index;
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};
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struct clock{
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int push_signal; //boolean
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int timer;
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};
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vector<process_detail> processes;
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queue<process_detail*> ready_queue_fifo;
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vector<process_detail*> waiting;
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process_detail* CPU1 = NULL;
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process_detail* CPU2 = NULL;
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ofstream output_file("cpu_times.txt");
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// ------------------------------------- THE FIFO ---------------------------------------
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void fifo() {
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// Clock initialized to 0
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struct clock time;
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memset(&time, 0, sizeof(struct clock));
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time.timer = 0;
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time.push_signal = 5;
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int process_count = processes.size();
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int completed_processes = 0;
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string out_string1 = "";
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string out_string2 = "";
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while(completed_processes < process_count) {
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// Breaking from the infinite loop
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for (int i = 0; i < process_count; ++i) {
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if (processes[i].burst_times[processes[i].current_burst_index] == -2) {
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completed_processes++;
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}
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}
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// Managing arrival times
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for (int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
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if(time.timer == processes[i].burst_times[0]) {
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ready_queue_fifo.push(&processes[i]);
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processes[i].current_burst_index++;
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}
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}
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}
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// Managing waiting queue
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for (int j = 0; j < waiting.size(); ++j) {
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if (waiting[j] != NULL) {
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if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
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ready_queue_fifo.push(waiting[j]);
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waiting[j]->current_burst_index++;
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waiting[j] = NULL;
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}
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}
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}
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if (CPU1 == NULL && !ready_queue_fifo.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU1 = ready_queue_fifo.front();
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CPU1->in_cpu1 = 1;
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// Record in_time when the process enters the CPU
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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// output_file << "P" << CPU1->pid + 1 << ",1 " << time.timer;
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ready_queue_fifo.pop();
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}
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if (CPU2 == NULL && !ready_queue_fifo.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU2 = ready_queue_fifo.front();
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CPU2->in_cpu2 = 1;
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// Record in_time when the process enters the CPU
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// output_file << endl;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
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ready_queue_fifo.pop();
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}
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// Check CPU1
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if(CPU1 != NULL) {
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu1 == 1) {
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if(CPU1->burst_times[processes[i].current_burst_index] == 0){
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// Record out_time when the process exits the CPU
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out_string1 += " " + to_string(time.timer);
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output_file << out_string1 << endl;
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// output_file << " " << time.timer << endl;
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CPU1->in_cpu1 = 0;
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CPU1->current_burst_index++;
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waiting.push_back(CPU1); // process added to waiting queue
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if(!ready_queue_fifo.empty()) {
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CPU1 = ready_queue_fifo.front(); // process added to CPU
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CPU1->in_cpu1 = 1;
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// output_file << "P" << CPU1->pid+1 << ",1" << " " << time.timer; // New entry time
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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ready_queue_fifo.pop();
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}
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else {
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CPU1 = NULL;
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}
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}
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}
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}
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}
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if(CPU2 != NULL) {
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu2 == 1) {
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if(CPU2->burst_times[processes[i].current_burst_index] == 0){
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// Record out_time when the process exits the CPU
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out_string2 += " " + to_string(time.timer);
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output_file << out_string2 << endl;
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// output_file << " " << time.timer << endl;
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CPU2->in_cpu2 = 0;
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CPU2->current_burst_index++;
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waiting.push_back(CPU2); // process added to waiting queue
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if(!ready_queue_fifo.empty()) {
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CPU2 = ready_queue_fifo.front(); // process added to CPU
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CPU2->in_cpu2 = 1;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid+1 << ",2" << " " << time.timer; // New entry time
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ready_queue_fifo.pop();
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}
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else {
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CPU2 = NULL;
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}
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}
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}
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}
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}
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if(CPU1 != NULL) {
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CPU1->burst_times[CPU1->current_burst_index]--;
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}
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if(CPU2 != NULL) {
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CPU2->burst_times[CPU2->current_burst_index]--;
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}
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for(int j = 0; j < waiting.size(); ++j) {
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if(waiting[j] != NULL) {
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if(waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
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waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
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}
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}
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}
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// Increment the timer
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time.timer++;
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}
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output_file.close();
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return;
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}
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// ----------------------------------------THE Shortest Job First----------------------------------
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// Custom comparator for the priority queue
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struct Compare {
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bool operator()(process_detail* a, process_detail* b) {
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// Compare the elements in the vector at the given indices
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return a->burst_times[a->current_burst_index] > b->burst_times[b->current_burst_index];
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}
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};
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priority_queue<process_detail*, vector<process_detail*>, Compare> ready_queue;
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void sjf() {
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// Clock initialized to 0
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struct clock time;
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memset(&time, 0, sizeof(struct clock));
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time.timer = 0;
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time.push_signal = 5;
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int process_count = processes.size();
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int completed_processes = 0;
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string out_string1 = "";
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string out_string2 = "";
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while(completed_processes < process_count) {
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// Breaking from the infinite loop
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for (int i = 0; i < process_count; ++i) {
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if (processes[i].burst_times[processes[i].current_burst_index] == -2) {
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completed_processes++;
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}
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}
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// Managing arrival times
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for (int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu1 != 1 || processes[i].in_cpu2 != 1) {
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if(time.timer == processes[i].burst_times[0]) {
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ready_queue.push(&processes[i]);
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processes[i].current_burst_index++;
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}
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}
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}
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// Managing waiting queue
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for (int j = 0; j < waiting.size(); ++j) {
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if (waiting[j] != NULL) {
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if (waiting[j]->burst_times[waiting[j]->current_burst_index] == 0) {
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ready_queue.push(waiting[j]);
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waiting[j]->current_burst_index++;
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waiting[j] = NULL;
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}
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}
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}
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if (CPU1 == NULL && !ready_queue.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU1 = ready_queue.top();
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CPU1->in_cpu1 = 1;
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// Record in_time when the process enters the CPU
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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// output_file << "P" << CPU1->pid + 1 << ",1 " << time.timer;
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ready_queue.pop();
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}
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if (CPU2 == NULL && !ready_queue.empty()) {
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// Assign the first process from the ready queue to the CPU
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CPU2 = ready_queue.top();
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CPU2->in_cpu2 = 1;
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// Record in_time when the process enters the CPU
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// output_file << endl;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid + 1 << ",2 " << time.timer;
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ready_queue.pop();
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}
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// Check CPU1
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if(CPU1 != NULL) {
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu1 == 1) {
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if(CPU1->burst_times[processes[i].current_burst_index] == 0){
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// Record out_time when the process exits the CPU
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out_string1 += " " + to_string(time.timer);
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output_file << out_string1 << endl;
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// output_file << " " << time.timer << endl;
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CPU1->in_cpu1 = 0;
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CPU1->current_burst_index++;
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waiting.push_back(CPU1); // process added to waiting queue
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if(!ready_queue.empty()) {
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CPU1 = ready_queue.top(); // process added to CPU
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CPU1->in_cpu1 = 1;
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// output_file << "P" << CPU1->pid+1 << ",1" << " " << time.timer; // New entry time
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out_string1 = "P" + to_string(CPU1->pid+1) + ",1 " + to_string(time.timer);
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ready_queue.pop();
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}
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else {
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CPU1 = NULL;
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}
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}
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}
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}
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}
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if(CPU2 != NULL) {
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//check cpu_burst complete
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for(int i = 0; i < process_count; ++i) {
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if(processes[i].in_cpu2 == 1) {
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if(CPU2->burst_times[processes[i].current_burst_index] == 0){
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// Record out_time when the process exits the CPU
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out_string2 += " " + to_string(time.timer);
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output_file << out_string2 << endl;
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// output_file << " " << time.timer << endl;
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CPU2->in_cpu2 = 0;
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CPU2->current_burst_index++;
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waiting.push_back(CPU2); // process added to waiting queue
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if(!ready_queue.empty()) {
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CPU2 = ready_queue.top(); // process added to CPU
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CPU2->in_cpu2 = 1;
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out_string2 = "P" + to_string(CPU2->pid+1) + ",2 " + to_string(time.timer);
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// output_file << "P" << CPU2->pid+1 << ",2" << " " << time.timer; // New entry time
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ready_queue.pop();
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}
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else {
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CPU2 = NULL;
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}
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}
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}
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}
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}
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if(CPU1 != NULL) {
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CPU1->burst_times[CPU1->current_burst_index]--;
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}
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if(CPU2 != NULL) {
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CPU2->burst_times[CPU2->current_burst_index]--;
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}
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for(int j = 0; j < waiting.size(); ++j) {
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if(waiting[j] != NULL) {
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if(waiting[j]->burst_times[waiting[j]->current_burst_index] != 0) {
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waiting[j]->burst_times[waiting[j]->current_burst_index]--; // reducing the io burst till it reaches 0
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}
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}
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}
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// Increment the timer
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time.timer++;
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}
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output_file.close();
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return;
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}
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int main(int argc, char **argv) {
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if(argc != 3)
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{
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cout <<"usage: ./scheduler.out <path-to-workload-file> <scheduler_algorithm>\nprovided arguments:\n";
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for(int i = 0; i < argc; i++)
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cout << argv[i] << "\n";
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return -1;
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}
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char *file_to_search_in = argv[1];
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char *scheduler_algorithm = argv[2];
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ifstream file(file_to_search_in, ios::binary);
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// ifstream file("temp.dat", ios::binary);
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string buffer;
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int pid = 0;
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while(getline(file, buffer)) {
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if(buffer[0] == '<'){
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continue;
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}
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istringstream iss(buffer);
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string word;
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struct process_detail pd;
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memset(&pd,0,sizeof(struct process_detail));
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pd.pid = pid++;
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pd.current_burst_index = 0;
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while(iss>>word){
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pd.burst_times.push_back(stoi(word));
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}
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processes.push_back(pd);
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}
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map<string, int> temp;
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temp["fifo"] = 1;
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temp["sjf"] = 2;
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temp["pre_sjf"] = 3;
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temp["rr"] = 4;
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string temp1 = scheduler_algorithm;
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// string temp1 = "fifo";
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switch(temp[temp1]){
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case 1:
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fifo();
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break;
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case 2:
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sjf();
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break;
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// case 3:
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// pre_sjf();
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// break;
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// case 4:
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// round_robin();
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// break;
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default:
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cout << "enter fifo or sjf or pre_sjf or rr" << endl;
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}
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return 0;
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} |