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57 lines
1.3 KiB
57 lines
1.3 KiB
package quic
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import (
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"sync"
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"v2ray.com/core/common/bytespool"
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"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/protocol"
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)
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type packetBuffer struct {
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Slice []byte
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// refCount counts how many packets the Slice is used in.
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// It doesn't support concurrent use.
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// It is > 1 when used for coalesced packet.
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refCount int
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}
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// Split increases the refCount.
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// It must be called when a packet buffer is used for more than one packet,
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// e.g. when splitting coalesced packets.
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func (b *packetBuffer) Split() {
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b.refCount++
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}
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// Release decreases the refCount.
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// It should be called when processing the packet is finished.
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// When the refCount reaches 0, the packet buffer is put back into the pool.
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func (b *packetBuffer) Release() {
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if cap(b.Slice) < 2048 {
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return
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}
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b.refCount--
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if b.refCount < 0 {
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panic("negative packetBuffer refCount")
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}
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// only put the packetBuffer back if it's not used any more
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if b.refCount == 0 {
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buffer := b.Slice[0:cap(b.Slice)]
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bufferPool.Put(buffer)
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}
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}
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var bufferPool *sync.Pool
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func getPacketBuffer() *packetBuffer {
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buffer := bufferPool.Get().([]byte)
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return &packetBuffer{
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refCount: 1,
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Slice: buffer[:protocol.MaxReceivePacketSize],
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}
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}
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func init() {
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bufferPool = bytespool.GetPool(int32(protocol.MaxReceivePacketSize))
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}
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