void
MembershipBookkeeping::SyncSourceLink::computeStats()
{
// See Appendix A.3
// compute cumulative packet lost.
setExtendedMaxSeqNum(getMaxSeqNum() + getSeqNumAccum());
uint32 expected =
(getExtendedMaxSeqNum() - getBaseSeqNum() + 1);
uint32 pc = getObservedPacketCount();
uint32 lost;
if ( 0 == pc )
lost = 0;
else
lost = expected - pc;
setCumulativePacketLost(lost);
// compute the fraction of packets lost during the last
// reporting interval.
uint32 expectedDelta = expected - expectedPrior;
expectedPrior = expected;
uint32 receivedDelta = getObservedPacketCount() -
receivedPrior;
receivedPrior = getObservedPacketCount();
uint32 lostDelta = expectedDelta - receivedDelta;
if ( expectedDelta == 0 || lostDelta <= 0 )
setFractionLost(0);
else
setFractionLost((lostDelta<<8) / expectedDelta );
}
/*add any new loss to the lossRecord*/
void updateLoss ()
{
uint64_t T_loss;
//if (higher==3) add to lossRecord;
//if (mylog->rear - mylog->front <4)
// return;
/*get the third biggest seqNum*/
uint32_t num = getMaxSeqNum(mylog,3);
uint32_t num1 = getMaxSeqNum(mylog,4);
uint32_t i;
int index,j;//index for return value of existSeqNum, j for last receive packet index
uint32_t latestNum;
/*add all packets(not received) that have exactly 3 higher packet seqNum*/
for (i=num;i>num1;i--)
//for (i=num;i>mylog->qBase[mylog->rear]->packet->seqNum;i--)
{
index = existSeqNum(mylog, i-1);
if (index == -1)
{
T_loss = T_lossCompute(i-1);
append(&lossRecord, i-1, T_loss);
countDroped++;
printf("%u lost\n\n", i-1);
latestNum = i-1;
}
else{
j = index;
break;
}
}
//if (ackNum != latestNum){
// preAckNum = ackNum;
ackNum = latestNum;
//}
}
