int main(int argc, char **argv)
{
struct event *eventptr;
struct msg msg2give;
struct pkt pkt2give;
int i,j;
char c;
int opt;
int seed;
//Check for number of arguments
if(argc != 5){
fprintf(stderr, "Missing arguments\n");
printf("Usage: %s -s SEED -w WINDOWSIZE\n", argv[0]);
return -1;
}
/*
* Parse the arguments
* http://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html
*/
while((opt = getopt(argc, argv,"s:w:")) != -1){
switch (opt){
case 's': if(!isNumber(optarg)){
fprintf(stderr, "Invalid value for -s\n");
return -1;
}
seed = atoi(optarg);
break;
case 'w': if(!isNumber(optarg)){
fprintf(stderr, "Invalid value for -w\n");
return -1;
}
WINSIZE = atoi(optarg);
break;
case '?': break;
default: printf("Usage: %s -s SEED -w WINDOWSIZE\n", argv[0]);
return -1;
}
}
init(seed);
A_init();
B_init();
while (1) {
eventptr = evlist; /* get next event to simulate */
if (eventptr==NULL)
goto terminate;
evlist = evlist->next; /* remove this event from event list */
if (evlist!=NULL)
evlist->prev=NULL;
if (TRACE>=2) {
printf("\nEVENT time: %f,",eventptr->evtime);
printf(" type: %d",eventptr->evtype);
if (eventptr->evtype==0)
printf(", timerinterrupt ");
else if (eventptr->evtype==1)
printf(", fromlayer5 ");
else
printf(", fromlayer3 ");
printf(" entity: %d\n",eventptr->eventity);
}
time_local = eventptr->evtime; /* update time to next event time */
if (nsim==nsimmax)
break; /* all done with simulation */
if (eventptr->evtype == FROM_LAYER5 ) {
generate_next_arrival(); /* set up future arrival */
/* fill in msg to give with string of same letter */
j = nsim % 26;
for (i=0; i<20; i++)
msg2give.data[i] = 97 + j;
if (TRACE>2) {
printf(" MAINLOOP: data given to student: ");
for (i=0; i<20; i++)
printf("%c", msg2give.data[i]);
printf("\n");
}
nsim++;
if (eventptr->eventity == A)
A_output(msg2give);
else
B_output(msg2give);
}
else if (eventptr->evtype == FROM_LAYER3) {
pkt2give.seqnum = eventptr->pktptr->seqnum;
pkt2give.acknum = eventptr->pktptr->acknum;
pkt2give.checksum = eventptr->pktptr->checksum;
for (i=0; i<20; i++)
pkt2give.payload[i] = eventptr->pktptr->payload[i];
if (eventptr->eventity ==A) /* deliver packet by calling */
A_input(pkt2give); /* appropriate entity */
else
B_input(pkt2give);
free(eventptr->pktptr); /* free the memory for packet */
}
else if (eventptr->evtype == TIMER_INTERRUPT) {
if (eventptr->eventity == A)
A_timerinterrupt();
else
B_timerinterrupt();
}
else {
printf("INTERNAL PANIC: unknown event type \n");
}
free(eventptr);
}
terminate:
//Do NOT change any of the following printfs
printf(" Simulator terminated at time %f\n after sending %d msgs from layer5\n",time_local,
nsim);
printf("\n");
printf("Protocol: GBN\n");
printf("[PA2]%d packets sent from the Application Layer of Sender A[/PA2]\n", A_application);
printf("[PA2]%d packets sent from the Transport Layer of Sender A[/PA2]\n", A_transport);
printf("[PA2]%d packets received at the Transport layer of Receiver B[/PA2]\n", B_transport);
printf("[PA2]%d packets received at the Application layer of Receiver B[/PA2]\n",
B_application);
printf("[PA2]Total time: %f time units[/PA2]\n", time_local);
printf("[PA2]Throughput: %f packets/time units[/PA2]\n", B_application/time_local);
return 0;
}
int main( int argc, char *argv[] ) {
struct event *eventptr;
struct msg msg2give;
struct pkt pkt2give;
int currentEntity;
int i,j;
// Do our initialization and any requested by student's Transport Layer
CallingArgc = argc;
CallingArgv = argv;
init( );
A_init();
B_init();
/* ***********************************************************************
We loop here forever. During these actions we get an event off the
event header. We analyze the action to be performed and go do it.
*************************************************************************/
while (TRUE) {
eventptr = evlist; // get next event to simulate from Q head
if (eventptr==NULL) // IF nothing to simulate, we're done
break;
evlist = evlist->next; // remove this event from event list
if (evlist != NULL) // and sort out forward and back ptrs
evlist->prev=NULL;
// Update simulation time to event time - by definition, the
// simulation time is the time of the last event.
CurrentSimTime = eventptr->evtime;
currentEntity = eventptr->eventity;
// If we've delivered the required number of messages, then we've
// fullfilled our task and are done.
if ( NumMsgs4To5 >= MaxMsgsToSimulate )
break; // all done with simulation
/* *******************************************************************
Here we've gotten a request to hand data from layer 5 to layer 4.
Generate the date we want to give to the student.
*********************************************************************/
if ( eventptr->evtype == FROM_LAYER5 ) {
// Use the sequence number as starter for the message string
j = GeneratingSeqNum[currentEntity]++;
// printf( "%X %d %d\n", &eventptr, currentEntity, j );
GetMessageString( currentEntity, j, &(msg2give.data[0]) );
/* Always print trace so we know it matches the receive */
if ( TraceLevel >= 0 ) {
//printf("%c: ", &(EntityLetter[currentEntity]) );
if ( currentEntity == AEntity )
printf("A: " );
else
printf("B: " );
printf(" %11.4f,", eventptr->evtime);
printf(" Layer 5 to 4 Message = ");
for (i=0; i<MESSAGE_LENGTH; i++)
printf("%c", msg2give.data[i]);
printf("\n");
}
// The simulation will actually end when the requested number of
// messages has been received back at layer 5. But there could be
// many packets in the system, and that total arrival could take
// a long time. We want to make sure we down't overwhelm the
// student code with messages that won't ever be delivered anyway.
//
if ( NumMsgs5To4 <= MaxMsgsToSimulate + 3 ) {
GenerateNextArrival(); // set up future arrival
NumMsgs5To4++; // # msgs from layer 5 to 4
}
if ( currentEntity == AEntity ) // Pass the data to layer 4 here
A_output(msg2give);
else
B_output(msg2give);
} /* END of event is from layer 5 */
/* *******************************************************************
This is a request to hand data from layer 3 up to student layer 4
*********************************************************************/
else if (eventptr->evtype == FROM_LAYER3 ) {
pkt2give.seqnum = eventptr->pktptr->seqnum;
pkt2give.acknum = eventptr->pktptr->acknum;
pkt2give.checksum = eventptr->pktptr->checksum;
for ( i = 0; i < MESSAGE_LENGTH; i++)
pkt2give.payload[i] = eventptr->pktptr->payload[i];
if ( TraceLevel >= 2 ) { /* Print out trace info if requested */
if ( eventptr->eventity == AEntity )
printf("A: " );
else
printf("B: " );
printf(" %11.4f,", eventptr->evtime);
printf(" Layer 3 to 4 ");
printf( "Seq/Ack/Check = %d/%d/%d: ",
eventptr->pktptr->seqnum, eventptr->pktptr->acknum,
eventptr->pktptr->checksum );
for (i=0; i<MESSAGE_LENGTH; i++)
printf("%c", eventptr->pktptr->payload[i] );
printf("\n");
}
if (eventptr->eventity == AEntity) /* deliver packet by calling */
A_input(pkt2give); /* appropriate entity */
else
B_input(pkt2give);
free(eventptr->pktptr); /* free the memory for packet */
} /* END of event is from layer 3 */
/* *******************************************************************
This is a request for a timer interrupt
*********************************************************************/
else if (eventptr->evtype == TIMER_INTERRUPT) {
if ( TraceLevel >= 2 ) { /* Print out trace info if requested */
if ( eventptr->eventity == AEntity )
printf("A: " );
else
printf("B: " );
printf(" %f,", eventptr->evtime);
printf(" Timer Interrupt\n");
}
if (eventptr->eventity == AEntity)
A_timerinterrupt();
else
B_timerinterrupt();
} /* END of event is interrupt request */
else {
printf("INTERNAL PANIC: unknown event type \n");
}
free(eventptr);
} // End of while
terminate:
printf("\n\nSimulator terminated at time %f\n after receiving %d msgs at layer5\n",
CurrentSimTime, NumMsgs4To5 );
printf( "Simulator Analysis:\n");
printf( " Number of messages sent from 5 to 4: %d\n", NumMsgs5To4 );
printf( " Number of messages received at Layer 5, side A: %d\n",
ExpectedSeqNum[0] );
printf( " Number of messages received at Layer 5, side B: %d\n",
ExpectedSeqNum[1] );
printf( " Number of messages incorrectly received at layer 5: %d\n",
NumMsgs5To4WithErr );
printf( " Number of packets entering the network: %d\n", NumMsgs4To3 );
printf( " Average number of packets already in network: %6.3f\n",
(double)NumSimutaneousMsgs / (double)NumMsgs4To3 );
printf( " Number of packets that the network lost: %d\n", NumMsgsLost );
printf( " Number of packets that the network corrupted: %d\n",
NumMsgsCorrupt );
printf( " Number of packets that the network put out of order: %d\n",
NumMsgsOutOfOrder );
return 0;
}
int _tmain(int argc, _TCHAR* argv[])
{
struct event *eventptr;
struct msg msg2give;
struct pkt pkt2give;
int i,j;
// char c;
init();
A_init();
B_init();
while (1) {
eventptr = evlist; /* get next event to simulate */
if (eventptr==NULL)
goto terminate;
evlist = evlist->next; /* remove this event from event list */
if (evlist!=NULL)
evlist->prev=NULL;
if (TRACE>=2) {
printf("\nEVENT time: %f,",eventptr->evtime);
printf(" type: %d",eventptr->evtype);
if (eventptr->evtype==0)
printf(", timerinterrupt ");
else if (eventptr->evtype==1)
printf(", fromlayer5 ");
else
printf(", fromlayer3 ");
printf(" entity: %d\n",eventptr->eventity);
}
time = eventptr->evtime; /* update time to next event time */
if (nsim==nsimmax)
break; /* all done with simulation */
if (eventptr->evtype == FROM_LAYER5 ) {
generate_next_arrival(); /* set up future arrival */
/* fill in msg to give with string of same letter */
j = nsim % 26;
for (i=0; i<20; i++)
msg2give.data[i] = 97 + j;
if (TRACE>2) {
printf(" MAINLOOP: data given to student: ");
for (i=0; i<20; i++)
printf("%c", msg2give.data[i]);
printf("\n");
}
nsim++;
if (eventptr->eventity == A)
A_output(msg2give);
else
B_output(msg2give);
}
else if (eventptr->evtype == FROM_LAYER3) {
pkt2give.seqnum = eventptr->pktptr->seqnum;
pkt2give.acknum = eventptr->pktptr->acknum;
pkt2give.checksum = eventptr->pktptr->checksum;
for (i=0; i<20; i++)
pkt2give.payload[i] = eventptr->pktptr->payload[i];
if (eventptr->eventity ==A) /* deliver packet by calling */
A_input(pkt2give); /* appropriate entity */
else
B_input(pkt2give);
delete(eventptr->pktptr); /* free the memory for packet */
}
else if (eventptr->evtype == TIMER_INTERRUPT) {
if (eventptr->eventity == A)
A_timerinterrupt();
else
B_timerinterrupt();
}
else {
printf("INTERNAL PANIC: unknown event type \n");
}
delete(eventptr);
}
terminate:
printf(" Simulator terminated at time %f\n after sending %d msgs from layer5\n",time,nsim);
return 0;
}