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device: preallocated buffers scheme

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Not useful now but quite possibly later.
This commit is contained in:
Jason A. Donenfeld 2018-09-16 23:10:19 +02:00
parent 39d6e4f2f1
commit 47d1140361
1 changed files with 26 additions and 7 deletions
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33
device.go
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@ -19,6 +19,9 @@ const (
DeviceRoutineNumberAdditional = 2
)
const preallocatedBuffers = 0
type Device struct {
isUp AtomicBool // device is (going) up
isClosed AtomicBool // device is closed? (acting as guard)
@ -66,7 +69,8 @@ type Device struct {
}
pool struct {
messageBuffers sync.Pool
messageBuffers *sync.Pool
reuseChan chan interface{}
}
queue struct {
@ -243,11 +247,19 @@ func (device *Device) SetPrivateKey(sk NoisePrivateKey) error {
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
if preallocatedBuffers == 0 {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
} else {
return (<-device.pool.reuseChan).(*[MaxMessageSize]byte)
}
}
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
device.pool.messageBuffers.Put(msg)
if preallocatedBuffers == 0 {
device.pool.messageBuffers.Put(msg)
} else {
device.pool.reuseChan <- msg
}
}
func NewDevice(tunDevice tun.TUNDevice, logger *Logger) *Device {
@ -274,10 +286,17 @@ func NewDevice(tunDevice tun.TUNDevice, logger *Logger) *Device {
device.indexTable.Init()
device.allowedips.Reset()
device.pool.messageBuffers = sync.Pool{
New: func() interface{} {
return new([MaxMessageSize]byte)
},
if preallocatedBuffers == 0 {
device.pool.messageBuffers = &sync.Pool{
New: func() interface{} {
return new([MaxMessageSize]byte)
},
}
} else {
device.pool.reuseChan = make(chan interface{}, preallocatedBuffers)
for i := 0; i < preallocatedBuffers; i += 1 {
device.pool.reuseChan <- new([MaxMessageSize]byte)
}
}
// create queues