Merge branch 'main' of https://git.kb28.ch/HEL/OS-Lab-Scheduler

executionSRTF.csv

@@ -0,0 +1,10 @@
+1,10,0,0
+2,72,32,2
+3,21,1,0
+4,11,1,0
+5,62,32,0
+6,22,2,0
+7,133,83,1
+8,42,12,0
+9,11,1,0
+10,93,33,0

performanceSRTF.csv

@@ -0,0 +1 @@
+293,3,3

simulator.c

@@ -184,6 +184,81 @@ void prio_list_print(struct prio_list * list) {
     printf("\n");
 }
 
+struct remtime_list {
+    struct pinfo ** proc;
+    int length;
+};
+
+/**
+ * Pops and returns the last element (shortest remaining time) of the given remtime list
+ * 
+ * Returns NULL if the list is empty
+ */
+struct pinfo * remtime_list_pop(struct remtime_list * list) {
+    if (list->length == 0) {
+        return NULL;
+    }
+
+    list->length--;
+    return *(list->proc + list->length);
+}
+
+/**
+ * Adds the given process in the remtime list at
+ * the appropriate place (according to its remaining time)
+ */
+void remtime_list_add(struct remtime_list * list, struct pinfo * proc) {
+    struct pinfo * proc2;
+    int idx = 0;
+
+    // Find first element (from the right) with longer remaining time
+    for (int i=list->length-1; i>=0; i--) {
+        proc2 = *(list->proc + i);
+        if (proc2->remaining_time > proc->remaining_time) {
+            idx = i+1;
+            break;
+        }
+    }
+    // Shift elements
+    for (int j=list->length-1; j>=idx; j--) {
+        *(list->proc + j + 1) = *(list->proc + j);
+    }
+    *(list->proc + idx) = proc;
+    list->length++;
+}
+
+/**
+ * Creates a new remtime list
+ */
+struct remtime_list * create_remtime_list(int max_size) {
+    struct pinfo ** processes = (struct pinfo **) malloc(sizeof(struct pinfo *) * max_size);
+    struct remtime_list * list = (struct remtime_list *) malloc(sizeof(struct remtime_list));
+    list->length = 0;
+    list->proc = processes;
+    return list;
+}
+
+/**
+ * Returns the last element (shortest remaining time) of the given remtime list
+ */
+struct pinfo * remtime_list_last(struct remtime_list * list) {
+    return *(list->proc + list->length - 1);
+}
+
+/**
+ * Prints the pids of the processes in the given remtime list
+ */
+void remtime_list_print(struct remtime_list * list) {
+    printf("queue: ");
+    for (int i=0; i < list->length; i++) {
+        if (i != 0) {
+            printf(", ");
+        }
+        printf("%d", (*(list->proc + i))->id);
+    }
+    printf("\n");
+}
+
 struct perf_info schedule_Pr(struct pinfo * processes) {
     struct perf_info perf = {0, 0, 0};
 
@@ -372,10 +447,128 @@ struct perf_info schedule_RR(struct pinfo *processes) {
     return perf;
 }
 
+struct perf_info schedule_SRTF(struct pinfo *processes) {
+    struct perf_info perf = {0, 0, 0};
+
+    int current_time = 0;
+    struct pinfo * current = NULL;
+    struct pinfo * next = processes;
+
+    int N = n_processes(processes);
+    printf("N = %d\n", N);
+
+    struct remtime_list * queue = create_remtime_list(N);
+    
+    int finished = 0;
+
+    while (finished != N) {
+        printf("\nCurrent time: %d / ", current_time);
+        if (current != NULL) {
+            printf("Current: %d / ", current->id);
+        } else {
+            printf("Current: none / ");
+        }
+        if (next != NULL) {
+            printf("Next: %d\n", next->id);
+        } else {
+            printf("Next: none\n");
+        }
+
+        if (current == NULL) {
+            printf("No running process: running %d\n", next->id);
+            current = next;
+            current->state = RUNNING;
+            next = next->next_pinfo;
+        
+        } else if (next != NULL) {
+            next->state = READY;
+            remtime_list_print(queue);
+            printf("Processing next process (%d)\n", next->id);
+            int delta = next->arrival_time - current_time;
+
+            // If current finished before next
+            while (current != NULL && current->remaining_time <= delta) {
+                printf("  (%d) Process %d finished before next\n", current_time, current->id);
+                current->state = FINISHED;
+                current_time += current->remaining_time;
+                delta = next->arrival_time - current_time;
+                current->turnaround_time = current_time - current->arrival_time;
+                current->remaining_time = 0;
+                finished++;
+                current = remtime_list_pop(queue);
+            }
+
+            if (current != NULL) {
+                printf("Removing time from current process (%d)\n", current->id);
+                current->remaining_time -= delta;
+                current->state = RUNNING;
+                printf("  New remaining time %d\n", current->remaining_time);
+            }
+            if (next->arrival_time > current_time) {
+                current_time = next->arrival_time;
+            }
+            next->state = READY;
+            
+
+            // If no running process, immediately run next process
+            if (current == NULL) {
+                printf("Queue is empty, running next process %d\n", next->id);
+                current = next;
+                current->state = RUNNING;
+                next = next->next_pinfo;
+
+            } else if (next->remaining_time < current->remaining_time) {
+                // Preempt current process
+                printf("Next process (%d) has shorter remaining time\n", next->id);
+                if (current->state == RUNNING) {
+                    printf("  Preempting current process (%d)\n", current->id);
+                    current->nb_time_pre_empted++;
+                    current->remaining_time -= next->arrival_time - current_time;
+                    current_time += CNTXT_SWITCH;
+                    perf.total_nr_ctxt_switch++;
+                }
+                current->state = READY;
+                remtime_list_add(queue, current);
+
+                // Run process with shortest remaining time
+                current = next;
+                current->state = RUNNING;
+                next = next->next_pinfo;
+            } else {
+                printf("Adding next process (%d) to list\n", next->id);
+                remtime_list_add(queue, next);
+                next = next->next_pinfo;
+            }
+            if (current != NULL) {
+                current->state = RUNNING;
+            }
+
+            
+        } else {
+            printf("No new processes, emptying queue\n");
+            while (current != NULL) {
+                printf("Completing process %d\n", current->id);
+                current->state = FINISHED;
+                current_time += current->remaining_time;
+                current->turnaround_time = current_time - current->arrival_time;
+                current->remaining_time = 0;
+                finished++;
+                current = remtime_list_pop(queue);
+                if (current != NULL) {
+                    current->state = RUNNING;
+                }
+            }
+        }
+    }
+    perf.total_time = current_time;
+    perf.total_time_ctxt_switch = perf.total_nr_ctxt_switch * CNTXT_SWITCH;
+
+    return perf;
+}
 
 void write_file(struct pinfo * process, struct perf_info * perf) {
-    FILE *myStream_execution = fopen("executionRRtest.csv", "w");
+    FILE *myStream_execution = fopen("executionSRTF.csv", "w");
-    FILE *myStream_performance = fopen("performanceRRtest.csv", "w");
+    FILE *myStream_performance = fopen("performanceSRTF.csv", "w");
 
     if (myStream_execution == NULL || myStream_performance == NULL) {
         perror("Erreur à l'ouverture des fichiers");
@@ -464,12 +657,15 @@ int main() {
     struct pinfo * processes = read_file();
 
     //struct perf_info perf = schedule_FCFS(processes);
-    struct perf_info perf = schedule_RR(processes); 
+    //struct perf_info perf = schedule_RR(processes); 
     //struct perf_info perf = schedule_Pr(processes);
+    struct perf_info perf = schedule_SRTF(processes);
 
     compute_waiting_time(processes);
 
     write_file(processes, &perf);
+    print_processes(processes);
+    print_perf(&perf);
 
     free_processes(processes);