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v2fly/common/alloc/buffer_pool.go

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package alloc
import (
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"os"
"strconv"
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"sync"
)
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type Pool interface {
Allocate() *Buffer
Free(*Buffer)
}
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type BufferPool struct {
chain chan []byte
allocator *sync.Pool
}
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func NewBufferPool(bufferSize, poolSize uint32) *BufferPool {
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pool := &BufferPool{
chain: make(chan []byte, poolSize),
allocator: &sync.Pool{
New: func() interface{} { return make([]byte, bufferSize) },
},
}
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for i := uint32(0); i < poolSize; i++ {
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pool.chain <- make([]byte, bufferSize)
}
return pool
}
func (p *BufferPool) Allocate() *Buffer {
var b []byte
select {
case b = <-p.chain:
default:
b = p.allocator.Get().([]byte)
}
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return CreateBuffer(b, p)
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}
func (p *BufferPool) Free(buffer *Buffer) {
rawBuffer := buffer.head
if rawBuffer == nil {
return
}
select {
case p.chain <- rawBuffer:
default:
p.allocator.Put(rawBuffer)
}
}
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const (
SmallBufferSize = 1600 - defaultOffset
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mediumBufferByteSize = 8 * 1024
BufferSize = mediumBufferByteSize - defaultOffset
largeBufferByteSize = 64 * 1024
LargeBufferSize = largeBufferByteSize - defaultOffset
PoolSizeEnvKey = "v2ray.buffer.size"
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)
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var (
smallPool = NewBufferPool(1600, 256)
mediumPool *BufferPool
largePool *BufferPool
)
func init() {
var size uint32 = 20
sizeStr := os.Getenv(PoolSizeEnvKey)
if len(sizeStr) > 0 {
customSize, err := strconv.ParseUint(sizeStr, 10, 32)
if err == nil {
size = uint32(customSize)
}
}
totalByteSize := size * 1024 * 1024
mediumPool = NewBufferPool(mediumBufferByteSize, totalByteSize/4*3/mediumBufferByteSize)
largePool = NewBufferPool(largeBufferByteSize, totalByteSize/4/largeBufferByteSize)
}