high performance sending queue

transport/internet/kcp/sending.go

@@ -0,0 +1,60 @@
+package kcp
+
+type SendingQueue struct {
+	start uint32
+	cap   uint32
+	len   uint32
+	list  []*Segment
+}
+
+func NewSendingQueue(size uint32) *SendingQueue {
+	return &SendingQueue{
+		start: 0,
+		cap:   size,
+		list:  make([]*Segment, size),
+		len:   0,
+	}
+}
+
+func (this *SendingQueue) IsFull() bool {
+	return this.len == this.cap
+}
+
+func (this *SendingQueue) IsEmpty() bool {
+	return this.len == 0
+}
+
+func (this *SendingQueue) Pop() *Segment {
+	if this.IsEmpty() {
+		return nil
+	}
+	seg := this.list[this.start]
+	this.list[this.start] = nil
+	this.len--
+	this.start++
+	if this.start == this.cap {
+		this.start = 0
+	}
+	return seg
+}
+
+func (this *SendingQueue) Push(seg *Segment) {
+	if this.IsFull() {
+		return
+	}
+	this.list[(this.start+this.len)%this.cap] = seg
+	this.len++
+}
+
+func (this *SendingQueue) Clear() {
+	for i := uint32(0); i < this.len; i++ {
+		this.list[(i+this.start)%this.cap].Release()
+		this.list[(i+this.start)%this.cap] = nil
+	}
+	this.start = 0
+	this.len = 0
+}
+
+func (this *SendingQueue) Len() uint32 {
+	return this.len
+}