Work on A5

Assignment5/hard_affinity.c

@@ -1,10 +1,35 @@
 #include <stdio.h>
 #include <pthread.h>
+#include <semaphore.h>
+#include <stdlib.h>
 #include "lib/queue.h"
 
+// TODO: Look into semaphore increment too much in print function, look into synchronization
+
+
 #define MAX_USERNAME_LENGTH 100
 int QUANTUM;
 int CPUS;
+int TIME = 0;
+
+// Semaphore for the print function
+sem_t print_semaphore;
+
+typedef struct ThreadArgs {
+	int cpu_id;
+	char *print_buffer;
+	Queue *summary_queue;
+	Queue *in_queue;
+} ThreadArgs;
+
+ThreadArgs *createArgs(int cpu_id, char* print_buffer, Queue *summary_queue, Queue *in_queue) {
+	ThreadArgs *args = malloc(sizeof(ThreadArgs));
+	args->cpu_id = cpu_id;
+	args->print_buffer = print_buffer;
+	args->summary_queue = summary_queue;
+	args->in_queue = in_queue;
+	return args;
+}
 
 Queue *input_queue() {
     Queue *queue = createQueue();
@@ -18,6 +43,9 @@ Queue *input_queue() {
 	scanf("%d", &CPUS);
 	while (getchar() != '\n'); // clear the newline from the buffer
 
+	// Make sure sem is init right after getting cpus
+	sem_init(&print_semaphore, 0, CPUS); // Initialize the semaphore
+
     while (getchar() != '\n'); // ignore the rest of the line, this is the table line
     // Loop through the process table and enqueue each process
     while (scanf("%99s %c %d %d %d", username, &job, &arrival_time, &duration, &affinity) != EOF) {
@@ -27,9 +55,12 @@ Queue *input_queue() {
     return queue;
 }
 
-void* print(void *print_queue_void) {
+void* print(void *args) {
-	// Cast the input queue to a Queue pointer
+	// Cast args and create local variables
-	Queue *print_queue = (Queue*) print_queue_void;
+	ThreadArgs *thread_args = (ThreadArgs*) args;
+	char *print_buffer = thread_args->print_buffer;
+	Queue *summary_queue = thread_args->summary_queue;
+	Queue *in_queue = thread_args->in_queue;
 
 	// Print the Time label as well as the CPU labels
 	printf("Time");
@@ -38,42 +69,47 @@ void* print(void *print_queue_void) {
 	}
 	printf("\n");
 
-
-
-
-}
-
-
-void* simulation(void *in_queue_void) {
-	// Cast the input queue to a Queue pointer
-	Queue *in_queue = (Queue*) in_queue_void;
-
-	// Summary creation
-    Process *process = in_queue->end;
-    Queue *summary_queue = createQueue();
 	for (int i = 0; i < in_queue->size; ++i) {
-        if (contains(summary_queue, process->username) == false) {
+		TIME++;
-            Process *copy = createProcess(process->username, process->job, process->arrival_time, process->duration, process->affinity);
+		// Allow the simulation to begin
-            enqueue(summary_queue, copy);
+		sem_post(&print_semaphore);
+
+		for (int j = 0; j < CPUS; ++j) {
+			printf("%d\t%c", TIME, print_buffer[i]);
 		}
-        process = process->prev_elem;
+		printf("\n");
 	}
 
+	// Print the summary
+	printf("\nSummary\n");
+	printList(summary_queue);
+
+	return NULL;
+}
+
+
+void* simulation(void *args) {
+	// Cast args and create local variables
+	ThreadArgs *thread_args = (ThreadArgs*) args;
+	Queue *in_queue = thread_args->in_queue;
+	Queue *summary_queue = thread_args->summary_queue;
+	char *print_buffer = thread_args->print_buffer;
+	int cpu_id = thread_args->cpu_id;
+
+
     // Loop variables
     int quantum = QUANTUM;
     int addedJobs = 0;
-    int time = 0;
+	Process *process = NULL;
 
     // Create a queue for the simulation
     Queue *sim_queue = createQueue();
-
-    printf("Time\tJob\n");
     while (true) {
-        time++;
+		sem_wait(&print_semaphore); // Wait for the print semaphore
         // Begin going through all jobs and enqueueing them if they have arrived
         process = in_queue->end;
         for (int i = 0; i < in_queue->size; i++) {
-            if (process->arrival_time == time) {
+            if (process->affinity == cpu_id && process->arrival_time == TIME) {
                 // Create copy to keep the queues separate
                 Process *copy = createProcess(process->username, process->job, process->arrival_time, process->duration, process->affinity);
                 enqueue(sim_queue, copy);
@@ -84,18 +120,18 @@ void* simulation(void *in_queue_void) {
 
         // Begin printing the current job
         process = sim_queue->end;
-        if (sim_queue->size == 0) { //If there is nothing in sim_queue, print "-"
+        if (sim_queue->size == 0) { //If there is nothing in sim_queue, put '-' in the print buffer
-            printf("%d\t-\n", time);
+            print_buffer[cpu_id] = '-';
             if (addedJobs == in_queue->size) {
                 break; // If all jobs have been added, and the simulation queue is empty, then we are done
             }
         } else {
-            printf("%d\t%c\n", time, process->job); // Print the current job
+            print_buffer[cpu_id] = process->job;
             process->duration--;
             quantum--;
             if (process->duration == 0) { // If the process is done, delete it
                 Process *temp = dequeue(sim_queue); // Store the process in a temp variable for deletion
-                search(summary_queue, temp->username)->finish_time = time; // Set the finish time for the summary queue
+                search(summary_queue, temp->username)->finish_time = TIME; // Set the finish time for the summary queue
                 destroyProcess(temp); // This should be called on every process
                 quantum = QUANTUM; // Make sure to reset the quantum when a process is done
             } else if (quantum == 0) { // If the quantum is 0, then we need to dequeue the process and enqueue it again
@@ -105,30 +141,39 @@ void* simulation(void *in_queue_void) {
             }
         }
     }
-
-    // Print the summary
-    printf("\nSummary\n");
-    printList(summary_queue);
-
     // Free memory for the simulation queue. There should be nothing left in it
     stop(sim_queue);
 
-    // We never dequeue from the summary queue, so we don't need to make sure about freeing dequeued processes
+	return NULL;
-    stop(summary_queue);
 }
 
+
 int main() {
     Queue *in_queue = input_queue(); // Create the input queue
-	Queue *print_queue = createQueue(); // Create the print queue
+	Queue *summary_queue = createQueue(); // Create the summary queue
+	char *print_buffer = malloc(sizeof(char) * CPUS); // Create the print buffer
+
+	// Summary creation
+	Process *process = in_queue->end;
+	for (int i = 0; i < in_queue->size; ++i) {
+		if (contains(summary_queue, process->username) == false) {
+			Process *copy = createProcess(process->username, process->job, process->arrival_time, process->duration, process->affinity);
+			enqueue(summary_queue, copy);
+		}
+		process = process->prev_elem;
+	}
 
 	// Create the print thread
 	pthread_t print_thread;
-	pthread_create(&print_thread, NULL, &print, print_queue);
+	ThreadArgs *print_args = createArgs(0, print_buffer, summary_queue, in_queue);
+	pthread_create(&print_thread, NULL, &print, print_args);
 
 	// Create the simulation threads
 	pthread_t threads[CPUS];
+	ThreadArgs* args[CPUS]; // Array of arguments for each thread, so we can free them later
 	for (int i = 0; i < CPUS; i++) {
-		pthread_create(&threads[i], NULL, &simulation, in_queue);
+		args[i] = createArgs(i, print_buffer, summary_queue, in_queue);
+		pthread_create(&threads[i], NULL, &simulation, args[i]);
 	}
 
 	// This should make sure all threads are done simulating, as the print function exits after simulation is done
@@ -136,7 +181,10 @@ int main() {
 	// Just to make sure all threads are done
 	for (int i = 0; i < CPUS; i++) {
 		pthread_join(threads[i], NULL);
+		free(args[i]);
 	}
     stop(in_queue); // Free memory for input queue
+	stop(summary_queue); // Free memory for summary queue
+	free(print_buffer); // Free memory for print buffer
     return 0;
 }