/*****************************************************************
*	DVsim.c?	Distance?Vector?Routing?Simulation?Package
*
*	Event?driven?simulation?of?distributed?asynchronous?
*	distance?vector?routing.??This?file?contains?the?network
*	simulation?code?which?emulates?layer?2?and?below:?
*
*??		-?simulates?packet?tranmissions?between?two?
*		??physically?connected?nodes
*
*		-?assumes?with?no?packet?loss?or?corruption
*
*??		-?calls?initializations?routines?rtinit0?etc.?before
*????		??beginning?simulation
*
*
*	Original?code?from?Kurose?and?Ross?Computer?Networking
*
*	Modified?by?S.?Dykes?	Apr.?2000
*	1.?Changed?RNG?to?use?drand48（）?with?seed?=?getpid（）
*	2.?Replaced?999?with?INF?
*	3.?created?common?include?file?DVsim.h
*	4.?extended?to?6?node?network?
*
*---------------------------------------------------------------*/
#define		DVSIM_H
#include?	“DVsim.h“
#include????“time.h“

#define?	FROM_layer2?????2
#define?	link_CHANGE?????10

/*----------------------------------------
*?	Event?list?and?possible?events
*---------------------------------------*/
struct?event?
{
???double	evtime;?????????/*?event?time?*/
???int?		evtype;?????????/*?event?type?code?*/
???int?		eventity;???????/*?entity?where?event?occurs?*/
???struct?rtpkt?*rtpktptr;?	/*?ptr?to?packet?（if?any）?assoc?w/?this?event?*/
???struct?event?*prev;
???struct?event?*next;
};
struct?event?*evlist?=?NULL;???

/*--------------------------------
*?	Simulation?clock
*-------------------------------*/
double	clocktime?=?0.000;
double	get_clock（）?{?return?clocktime;?}

/*--------------------------------
*?	Function?prototypes
*-------------------------------*/
void?	init（）;
void?	insertevent?（struct?event?*）;
void?	printevlist（）;
void?	tolayer2?（struct?rtpkt?）;

/*-------------------------------
*	MAIN
*-------------------------------*/
main（）
{
	int?i;
???struct?event?*eventptr;
???
???/*----------------------------------------
???*?	Loop?until?we?run?out?of?events
???*---------------------------------------*/
???init（）;
???while?（1）?
???{
	/*----------------------------------------
	*	Get?next?event?from?top?of?list
	*???????Done?if?event?list?is?empty
	*---------------------------------------*/
????????if?（!?（eventptr?=?evlist）?）?break;????????????
????????evlist?=?evlist->next;????????
????????if?（evlist）?evlist->prev=NULL;

	/*----------------------------------------
	*	Trace?info
	*---------------------------------------*/
????????if?（TRACE>1）?{
???????????printf（“\nMAIN:?rcv?event?t=%.3f?at?%d“?	
			eventptr->evtime?eventptr->eventity）;
???????????if?（eventptr->evtype?==?FROM_layer2?）?{
	??????printf（“?src:%2d“??eventptr->rtpktptr->sourceid）;
??????????????printf（“?dest:%2d“?eventptr->rtpktptr->destid）;
??????????????printf（“?contents:?“）;
	??????for?（i=0;?irtpktptr->mincost[i]）;
??????????????printf（“\n“）;
	???}
????????}
	/*----------------------------------------
	*	Update?clock?to?next?event?time
	*-----------------------------

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????2421??2009-11-18?12:51??node3.c

?????文件??????11669??2009-11-18?12:21??DVsim.c

?????文件???????2812??2009-11-18?12:43??DVsim.h

?????文件???????3967??2009-11-18?12:33??node0.c

?????文件???????2421??2009-11-18?12:51??node1.c

?????文件???????2583??2009-11-18?12:51??node2.c

-----------?---------??----------?-----??----

????????????????25873????????????????????6