/* External definitions for single-server queueing system. */

#include <stdio.h>
#include <math.h>
#include "rand.h"   /* Header file for random number generator */

#define Q_LIMIT 100  /* Limit on queue length. */
#define BUSY      1  /* Mnemonics for server's being busy */
#define IDLE      0  /* and idle. */

int   next_event_type, num_custs_delayed, num_delays_required,
      num_events, num_in_q, server_status;
float area_num_in_q, area_server_status, mean_interarrival,
      mean_service, time, time_arrival[Q_LIMIT+1],
      time_last_event, time_next_event[3], total_of_delays;
FILE  *infile, *outfile;

void  initialize(void);
void  timing(void);
void  arrive(void);
void  depart(void);
void  report(void);
void  update_time_avg_stats(void);
float expon(float mean);