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OS-Lab-Scheduler/simulator.c

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8.9 KiB
C
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#include <stdlib.h>
#include <stdio.h>
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#include <string.h>
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#define RR_QUANTUM 2
#define CNTXT_SWITCH 1
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#define MAX_PROCESSES 10
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enum pstate {
WAITING,
READY,
FINISHED
};
struct pinfo {
int id;
int arrival_time;
int execution_time;
int priority;
int wait_time;
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int turnaround_time;
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int remaining_time;
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int nb_time_pre_empted; // Ajouté pour compter les préemptions
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enum pstate state;
struct pinfo * next_pinfo;
};
struct perf_info {
int total_time;
int total_nr_ctxt_switch;
int total_time_ctxt_switch;
};
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void print_perf(struct perf_info * perf) {
printf("Total time: %d\n", perf->total_time);
printf("Total number of context switches: %d\n", perf->total_nr_ctxt_switch);
printf("Total time spent on context switching: %d\n", perf->total_time_ctxt_switch);
}
void print_pinfo(struct pinfo * info) {
printf("<Process {\n");
printf(" PID: %d\n", info->id);
printf(" Arrival time: %d\n", info->arrival_time);
printf(" Execution time: %d\n", info->execution_time);
printf(" Priority: %d\n", info->priority);
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printf(" Wait time: %d\n", info->wait_time);
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printf(" Turnaround time: %d\n", info->turnaround_time);
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printf(" Remaining time: %d\n", info->remaining_time);
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printf(" NEXT -> %p\n", info->next_pinfo);
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printf("}>\n");
}
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void print_processes(struct pinfo * processes) {
while (processes != NULL) {
print_pinfo(processes);
processes = processes->next_pinfo;
}
}
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struct pinfo * create_process(int id, int arrival_time, int execution_time, int priority) {
struct pinfo * info = malloc(sizeof(struct pinfo));
info->id = id;
info->arrival_time = arrival_time;
info->execution_time = execution_time;
info->priority = priority;
info->wait_time = 0;
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info->turnaround_time = 0;
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info->remaining_time = execution_time;
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info->nb_time_pre_empted = 0; // Initialiser le nombre de préemptions
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info->state = WAITING;
info->next_pinfo = NULL;
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return info;
}
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// Méthode de planification FCFS
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struct perf_info schedule_FCFS(struct pinfo * processes) {
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int current_time = 0;
struct pinfo * process = processes;
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struct perf_info perf = {0, 0, 0};
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while (process != NULL) {
int wait_time = current_time - process->arrival_time;
if (wait_time < 0) {
wait_time = 0;
}
process->wait_time = wait_time;
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process->turnaround_time = process->execution_time + process->wait_time;
current_time = process->arrival_time + process->turnaround_time;
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process = process->next_pinfo;
}
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perf.total_time = current_time;
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return perf;
}
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struct perf_info schedule_RR(struct pinfo *processes) { // Déclaration de la fonction schedule_RR qui prend un pointeur vers une liste de processus
struct perf_info perf = {0, 0, 0}; // Initialisation de la structure de performance avec des valeurs à zéro
int current_time = 0; // Variable pour suivre le temps actuel
int finished_processes = 0; // Compteur pour le nombre de processus terminés
while (finished_processes < MAX_PROCESSES) { // Boucle principale jusqu'à ce que tous les processus soient terminés
int process_found = 0; // Indicateur pour savoir si un processus prêt a été trouvé
struct pinfo *current_process = processes; // Pointeur pour parcourir la liste des processus
while (current_process != NULL) { // Boucle pour parcourir tous les processus
// Vérifiez si le processus est prêt à s'exécuter
if (current_process->state != FINISHED && current_process->arrival_time <= current_time) { // Vérifie si le processus n'est pas fini et est arrivé
process_found = 1; // Un processus prêt à s'exécuter a été trouvé
int time_slice = (current_process->remaining_time < RR_QUANTUM) ? current_process->remaining_time : RR_QUANTUM; // Calcule la tranche de temps à exécuter
// Simuler l'exécution
current_time += time_slice; // Incrémente le temps actuel par la tranche de temps
current_process->remaining_time -= time_slice; // Diminue le temps restant du processus
// Calculer les temps d'attente pour les autres processus
struct pinfo *other_process = processes; // Pointeur pour parcourir à nouveau la liste des processus
while (other_process != NULL) { // Boucle pour parcourir tous les autres processus
if (other_process->state != FINISHED && other_process != current_process && other_process->arrival_time <= current_time) { // Vérifie si l'autre processus est prêt
other_process->wait_time += time_slice; // Augmente le temps d'attente des autres processus
}
other_process = other_process->next_pinfo; // Passe au processus suivant
}
// Gérer les statistiques de préemption
if (current_process->remaining_time == 0) { // Vérifie si le processus est terminé
current_process->state = FINISHED; // Met à jour l'état du processus à fini
finished_processes++; // Incrémente le compteur de processus terminés
current_process->turnaround_time = current_time - current_process->arrival_time; // Calcule le temps de turnaround
} else {
// Incrémenter le nombre de préemptions
current_process->nb_time_pre_empted++; // Incrémente le compteur de préemptions pour le processus actuel
perf.total_nr_ctxt_switch++; // Incrémente le nombre total de commutations de contexte
}
// Débogage : Afficher les informations du processus
printf("Processus %d: remaining_time=%d, nb_time_pre_empted=%d\n", // Affiche les informations de débogage pour le processus actuel
current_process->id, current_process->remaining_time, current_process->nb_time_pre_empted);
}
current_process = current_process->next_pinfo; // Passe au processus suivant dans la liste
}
if (!process_found) { // Vérifie si aucun processus prêt n'a été trouvé
// Aucun processus prêt, avancer le temps
current_time++; // Incrémente le temps actuel si aucun processus n'est prêt
}
}
perf.total_time = current_time; // Enregistre le temps total écoulé dans la structure de performance
return perf; // Renvoie la structure de performance
}
void write_file(struct pinfo * process, struct perf_info * perf) {
FILE *myStream_execution = fopen("executionRR.csv", "w");
FILE *myStream_performance = fopen("performanceRR.csv", "w");
if (myStream_execution == NULL || myStream_performance == NULL) {
perror("Erreur à l'ouverture des fichiers");
return;
}
while (process != NULL) {
fprintf(myStream_execution, "%d,%d,%d,%d\n",
process->id,
process->turnaround_time,
process->wait_time,
process->nb_time_pre_empted);
process = process->next_pinfo;
}
fclose(myStream_execution);
fprintf(myStream_performance, "%d,%d,%d\n",
perf->total_time,
perf->total_nr_ctxt_switch,
perf->total_time_ctxt_switch);
fclose(myStream_performance);
}
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struct pinfo * read_file() {
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FILE * file = fopen("tasks.csv", "r");
unsigned long buf_size = sizeof(char) * 64;
char * line = (char *) malloc(buf_size);
char * pid_str;
char * arrival_str;
char * execution_str;
char * prio_str;
struct pinfo * first = NULL;
struct pinfo * last = NULL;
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struct pinfo * process;
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while (fgets(line, buf_size, file)) {
pid_str = strtok(line, " ");
arrival_str = strtok(NULL, " ");
execution_str = strtok(NULL, " ");
prio_str = strtok(NULL, " ");
process = create_process(
atoi(pid_str),
atoi(arrival_str),
atoi(execution_str),
atoi(prio_str)
);
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// Si la liste n'est pas initialisée
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if (first == NULL) {
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first = process;
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}
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// Si un élément est déjà dans la liste
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if (last != NULL) {
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last->next_pinfo = process;
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}
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last = process;
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print_pinfo(process);
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}
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free(line);
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fclose(file);
return first;
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}
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void free_processes(struct pinfo * next) {
struct pinfo * cur;
while (next != NULL) {
cur = next;
next = cur->next_pinfo;
free(cur);
}
}
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int main() {
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struct pinfo * processes = read_file();
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//struct perf_info perf = schedule_FCFS(processes); // Remise en place de FCFS
struct perf_info perf = schedule_RR(processes);
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write_file(processes, &perf);
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free_processes(processes);
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return 0;
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}