/* file: event.h */
/*
 * Tom Laramee
 * ECE 671 - Simulation #2 - Selective Repeat
 *
 * event.h header file 
 */



#include <stdio.h>
#include <stdlib.h>
#include <math.h>

extern struct event *evlist; 
extern struct proc *qptr[];
extern int iseed;              /* random number generator seed       */
extern double lambda;          /* Node arrival rate (main.c)         */
extern double timeNextEvent;   /* Time of next event                 */
extern double sysTime;         /* Global clock time                  */


/************************************************************************/
/*                   global data structures                             */
/************************************************************************/
struct event {
    double evtime;    /* this field used for insertion into event list */
    int evcode;       /*==0 => arrival to system, 1 is departure       */
    int nodecode;     /* nodeid at which event takes place             */
    int status;
    struct event *next;
    struct event *prev;
    };


struct proc {                  /* structure containing info about a queued job */
    long int jobid;            /* id of job arriving                           */
    double local_arrival_time; /* arrival time at this queue                   */
    double sys_arrival_time;   /* arrival time from the sourse                 */
    double attribute;
    struct proc *next;
    struct proc *prev;
    };

typedef struct proc  tProc;
typedef struct proc * tProcPtr;
typedef struct event tEvent;
typedef struct event * tEventPtr;

/* ~~~~~~~~~~~~~~~~~~~~~ prototypes ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
struct event *alloc_evrec(void);
void free_evrec(struct event *evptr);
struct event *get_nextevent(void);
struct proc *alloc_procrec(void);
void free_procrec(struct proc *procptr);
struct proc *get_firstproc(int q_id);
void insertproc(struct proc *procptr, int q_id);
void init_ptrs(void);
double uni(void);
void nextarrival( void );