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103 lines
1.6 KiB
103 lines
1.6 KiB
package kcp
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import (
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"sync"
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"github.com/v2ray/v2ray-core/common/alloc"
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)
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const (
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NumDistro = 5
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DistroSize = 1600
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)
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type Buffer struct {
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sync.Mutex
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buffer *alloc.Buffer
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next int
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released int
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hold bool
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distro [NumDistro]*alloc.Buffer
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}
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func NewBuffer() *Buffer {
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b := &Buffer{
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next: 0,
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released: 0,
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hold: true,
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buffer: alloc.NewBuffer(),
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}
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for idx := range b.distro {
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content := b.buffer.Value[idx*DistroSize : (idx+1)*DistroSize]
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b.distro[idx] = alloc.CreateBuffer(content, b)
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}
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return b
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}
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func (this *Buffer) IsEmpty() bool {
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this.Lock()
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defer this.Unlock()
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return this.next == NumDistro
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}
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func (this *Buffer) Allocate() *alloc.Buffer {
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this.Lock()
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defer this.Unlock()
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if this.next == NumDistro {
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return nil
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}
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b := this.distro[this.next]
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this.next++
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return b
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}
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func (this *Buffer) Free(b *alloc.Buffer) {
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this.Lock()
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defer this.Unlock()
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this.released++
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if !this.hold && this.released == this.next {
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this.ReleaseBuffer()
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}
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}
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func (this *Buffer) Release() {
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this.Lock()
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defer this.Unlock()
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if this.next == this.released {
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this.ReleaseBuffer()
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}
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this.hold = false
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}
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func (this *Buffer) ReleaseBuffer() {
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this.buffer.Release()
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this.buffer = nil
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for idx := range this.distro {
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this.distro[idx] = nil
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}
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}
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var (
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globalBuffer *Buffer
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globalBufferAccess sync.Mutex
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)
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func AllocateBuffer() *alloc.Buffer {
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globalBufferAccess.Lock()
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defer globalBufferAccess.Unlock()
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if globalBuffer == nil {
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globalBuffer = NewBuffer()
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}
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b := globalBuffer.Allocate()
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if globalBuffer.IsEmpty() {
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globalBuffer.Release()
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globalBuffer = nil
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}
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return b
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}
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