/
linked.go
333 lines (309 loc) · 5.88 KB
/
linked.go
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package suft
type qNode struct {
*packet
prev *qNode
next *qNode
sent int64 // last sent time
sent_1 int64 // prev sent time
miss int // sack miss count
}
type linkedMap struct {
head *qNode
tail *qNode
qmap map[uint32]*qNode
lastIns *qNode
maxCtnSeq uint32
mode int
}
const (
_QModeIn = 1
_QModeOut = 2
)
func newLinkedMap(qmode int) *linkedMap {
return &linkedMap{
qmap: make(map[uint32]*qNode),
mode: qmode,
}
}
func (l *linkedMap) get(seq uint32) (i *qNode) {
i = l.qmap[seq]
return
}
func (l *linkedMap) contains(seq uint32) bool {
_, y := l.qmap[seq]
return y
}
func (l *linkedMap) size() int32 {
return int32(len(l.qmap))
}
func (l *linkedMap) reset() {
l.head = nil
l.tail = nil
l.lastIns = nil
l.maxCtnSeq = 0
l.qmap = make(map[uint32]*qNode)
}
func (l *linkedMap) isEqualsHead(seq uint32) bool {
return l.head != nil && seq == l.head.seq
}
func (l *linkedMap) distanceOfHead(seq uint32) int32 {
if l.head != nil {
return int32(seq - l.head.seq)
} else {
return -1
}
}
func (l *linkedMap) appendTail(one *qNode) {
if l.tail != nil {
l.tail.next = one
one.prev = l.tail
l.tail = one
} else {
l.head = one
l.tail = one
}
l.qmap[one.seq] = one
}
// xxx - n - yyy
// xxx - yyy
func (l *linkedMap) deleteAt(n *qNode) {
x, y := n.prev, n.next
if x != nil {
x.next = y
} else {
l.head = y
}
if y != nil {
y.prev = x
} else {
l.tail = x
}
n.prev, n.next = nil, nil
delete(l.qmap, n.seq)
}
// delete with n <- ...n |
func (l *linkedMap) deleteBefore(n *qNode) (left *qNode, deleted int32) {
for i := n; i != nil; i = i.prev {
delete(l.qmap, i.seq)
if i.scnt != _SENT_OK {
deleted++
// only outQ could delete at here
if l.mode == _QModeOut {
bpool.Put(i.buffer)
i.buffer = nil
}
}
}
left = l.head
l.head = n.next
n.next = nil
if l.head != nil {
l.head.prev = nil
} else { // n.next is the tail and is nil
l.tail = nil
}
return
}
// xxx - ref
// xxx - one - ref
func (l *linkedMap) insertBefore(ref, one *qNode) {
x := ref.prev
if x != nil {
x.next = one
one.prev = x
} else {
l.head = one
}
ref.prev = one
one.next = ref
l.qmap[one.seq] = one
}
// ref - zzz
// ref - one - zzz
func (l *linkedMap) insertAfter(ref, one *qNode) {
z := ref.next
if z == nil { // append
ref.next = one
l.tail = one
} else { // insert mid
z.prev = one
ref.next = one
}
one.prev = ref
one.next = z
l.qmap[one.seq] = one
}
// baseHead: the left outside boundary
// if inserted, return the distance between newNode with baseHead
func (l *linkedMap) searchInsert(one *qNode, baseHead uint32) (dis int64) {
for i := l.tail; i != nil; i = i.prev {
dis = int64(one.seq) - int64(i.seq)
if dis > 0 {
l.insertAfter(i, one)
return
} else if dis == 0 {
// duplicated
return
}
}
if one.seq <= baseHead {
return 0
}
if l.head != nil {
l.insertBefore(l.head, one)
} else {
l.head = one
l.tail = one
l.qmap[one.seq] = one
}
dis = int64(one.seq) - int64(baseHead)
return
}
func (l *linkedMap) updateContinuous(i *qNode) bool {
var lastCtnSeq = l.maxCtnSeq
for ; i != nil; i = i.next {
if i.seq-lastCtnSeq == 1 {
lastCtnSeq = i.seq
} else {
break
}
}
if lastCtnSeq != l.maxCtnSeq {
l.maxCtnSeq = lastCtnSeq
return true
}
return false
}
func (l *linkedMap) isWholeContinuous() bool {
return l.tail != nil && l.maxCtnSeq == l.tail.seq
}
/*
func (l *linkedMap) searchMaxContinued(baseHead uint32) (*qNode, bool) {
var last *qNode
for i := l.head; i != nil; i = i.next {
if last != nil {
if i.seq-last.seq > 1 {
return last, true
}
} else {
if i.seq != baseHead {
return nil, false
}
}
last = i
}
if last != nil {
return last, true
} else {
return nil, false
}
}
*/
func (q *qNode) forward(n int) *qNode {
for ; n > 0 && q != nil; n-- {
q = q.next
}
return q
}
// prev of bitmap start point
func (l *linkedMap) makeHolesBitmap(prev uint32) ([]uint64, uint32) {
var start *qNode
var bits uint64
var j uint32
for i := l.head; i != nil; i = i.next {
if i.seq >= prev+1 {
start = i
break
}
}
var bitmap []uint64
// search start which is the recent successor of [prev]
Iterator:
for i := start; i != nil; i = i.next {
dis := i.seq - prev
prev = i.seq
j += dis // j is next bit index
for j >= 65 {
if len(bitmap) >= 20 { // bitmap too long
break Iterator
}
bitmap = append(bitmap, bits)
bits = 0
j -= 64
}
bits |= 1 << (j - 1)
}
if j > 0 {
// j -> (0, 64]
bitmap = append(bitmap, bits)
}
return bitmap, j
}
// from= the bitmap start point
func (l *linkedMap) deleteByBitmap(bmap []uint64, from uint32, tailBitsLen uint32) (deleted, missed int32, lastContinued bool) {
var start = l.qmap[from]
if start != nil {
// delete predecessors
if pred := start.prev; pred != nil {
_, n := l.deleteBefore(pred)
deleted += n
}
} else {
// [from] is out of bounds
return
}
var j, bitsLen uint32
var bits uint64
bits, bmap = bmap[0], bmap[1:]
if len(bmap) > 0 {
bitsLen = 64
} else {
// bmap.len==1, tail is here
bitsLen = tailBitsLen
}
// maxContinued will save the max continued node (from [start]) which could be deleted safely.
// keep the queue smallest
var maxContinued *qNode
lastContinued = true
for i := start; i != nil; j++ {
if j >= bitsLen {
if len(bmap) > 0 {
j = 0
bits, bmap = bmap[0], bmap[1:]
if len(bmap) > 0 {
bitsLen = 64
} else {
bitsLen = tailBitsLen
}
} else {
// no more pages
goto finished
}
}
if bits&1 == 1 {
if lastContinued {
maxContinued = i
}
if i.scnt != _SENT_OK {
// no mark means first deleting
deleted++
}
// don't delete, just mark it
i.scnt = _SENT_OK
} else {
// known it may be lost
if i.miss == 0 {
missed++
}
i.miss++
lastContinued = false
}
bits >>= 1
i = i.next
}
finished:
if maxContinued != nil {
l.deleteBefore(maxContinued)
}
return
}