mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-23 02:26:49 -05:00
103 lines
1.6 KiB
Go
103 lines
1.6 KiB
Go
package kcp
|
|
|
|
import (
|
|
"sync"
|
|
|
|
"github.com/v2ray/v2ray-core/common/alloc"
|
|
)
|
|
|
|
const (
|
|
NumDistro = 5
|
|
DistroSize = 1600
|
|
)
|
|
|
|
type Buffer struct {
|
|
sync.Mutex
|
|
buffer *alloc.Buffer
|
|
|
|
next int
|
|
released int
|
|
hold bool
|
|
distro [NumDistro]*alloc.Buffer
|
|
}
|
|
|
|
func NewBuffer() *Buffer {
|
|
b := &Buffer{
|
|
next: 0,
|
|
released: 0,
|
|
hold: true,
|
|
buffer: alloc.NewBuffer(),
|
|
}
|
|
for idx := range b.distro {
|
|
content := b.buffer.Value[idx*DistroSize : (idx+1)*DistroSize]
|
|
b.distro[idx] = alloc.CreateBuffer(content, b)
|
|
}
|
|
return b
|
|
}
|
|
|
|
func (this *Buffer) IsEmpty() bool {
|
|
this.Lock()
|
|
defer this.Unlock()
|
|
|
|
return this.next == NumDistro
|
|
}
|
|
|
|
func (this *Buffer) Allocate() *alloc.Buffer {
|
|
this.Lock()
|
|
defer this.Unlock()
|
|
if this.next == NumDistro {
|
|
return nil
|
|
}
|
|
b := this.distro[this.next]
|
|
this.next++
|
|
return b
|
|
}
|
|
|
|
func (this *Buffer) Free(b *alloc.Buffer) {
|
|
this.Lock()
|
|
defer this.Unlock()
|
|
|
|
this.released++
|
|
if !this.hold && this.released == this.next {
|
|
this.ReleaseBuffer()
|
|
}
|
|
}
|
|
|
|
func (this *Buffer) Release() {
|
|
this.Lock()
|
|
defer this.Unlock()
|
|
|
|
if this.next == this.released {
|
|
this.ReleaseBuffer()
|
|
}
|
|
this.hold = false
|
|
}
|
|
|
|
func (this *Buffer) ReleaseBuffer() {
|
|
this.buffer.Release()
|
|
this.buffer = nil
|
|
for idx := range this.distro {
|
|
this.distro[idx] = nil
|
|
}
|
|
}
|
|
|
|
var (
|
|
globalBuffer *Buffer
|
|
globalBufferAccess sync.Mutex
|
|
)
|
|
|
|
func AllocateBuffer() *alloc.Buffer {
|
|
globalBufferAccess.Lock()
|
|
defer globalBufferAccess.Unlock()
|
|
|
|
if globalBuffer == nil {
|
|
globalBuffer = NewBuffer()
|
|
}
|
|
b := globalBuffer.Allocate()
|
|
if globalBuffer.IsEmpty() {
|
|
globalBuffer.Release()
|
|
globalBuffer = nil
|
|
}
|
|
return b
|
|
}
|