mmn.h

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <stdbool.h>
#include <time.h>
#include <float.h>
// Define node 
typedef struct node{
	struct node *next;
	double it;  // interarrival time
	double st;  // service time
	double at;  // arrival time
	double dt;	// departure time
	double wt;  // waiting time
	int which_server;
} node;

// Define queue
typedef struct queue{
	node *head;
	node *tail;
	int size;
	double t;	// queue time
	double dt;	// the departure timm of last person
} queue;

// Define system
typedef struct _system{
	double time; 			// Time variance
	double waiting_time;	// Waiting time in system
	double system_time; 	// Total time in system 
	double total_service_time;
	queue **servers;	
	int n; 					// N servers
	double lambda;
	double mu;
} _system;

node *node_new(double it, double st);	// Create a new node
queue *q_new(); 						// Create a new queue
_system *system_new(int n, double lambda, double mu);
bool q_insert(queue *q, node *n);		// Insert node into queue
node *q_pop(queue *q);					// Pop a node out 

double rand_exp(double lambda);			// Generate exponential RV with lambda rate
double rand_normal(double std, double mean);
void run_service(_system s);


/* Global variables */
double lambda_1, lamda_2, mu;			// Parameters for generate exp rv
double samples;							// Number of events
int count;
queue *q_system;						// Queue which stores all events

void scheduling(_system *s, node *n, queue *q_next_system, FILE *fp);
void show_system();
double get_dt(_system *s);