wireguard-go/device/pools.go

/* SPDX-License-Identifier: MIT
 *
 * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
 */

package device

import "sync"

func (device *Device) PopulatePools() {
	if PreallocatedBuffersPerPool == 0 {
		device.pool.messageBufferPool = &sync.Pool{
			New: func() interface{} {
				return new([MaxMessageSize]byte)
			},
		}
		device.pool.inboundElementPool = &sync.Pool{
			New: func() interface{} {
				return new(QueueInboundElement)
			},
		}
		device.pool.outboundElementPool = &sync.Pool{
			New: func() interface{} {
				return new(QueueOutboundElement)
			},
		}
	} else {
		device.pool.messageBufferReuseChan = make(chan *[MaxMessageSize]byte, PreallocatedBuffersPerPool)
		for i := 0; i < PreallocatedBuffersPerPool; i++ {
			device.pool.messageBufferReuseChan <- new([MaxMessageSize]byte)
		}
		device.pool.inboundElementReuseChan = make(chan *QueueInboundElement, PreallocatedBuffersPerPool)
		for i := 0; i < PreallocatedBuffersPerPool; i++ {
			device.pool.inboundElementReuseChan <- new(QueueInboundElement)
		}
		device.pool.outboundElementReuseChan = make(chan *QueueOutboundElement, PreallocatedBuffersPerPool)
		for i := 0; i < PreallocatedBuffersPerPool; i++ {
			device.pool.outboundElementReuseChan <- new(QueueOutboundElement)
		}
	}
}

func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
	if PreallocatedBuffersPerPool == 0 {
		return device.pool.messageBufferPool.Get().(*[MaxMessageSize]byte)
	} else {
		return <-device.pool.messageBufferReuseChan
	}
}

func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
	if PreallocatedBuffersPerPool == 0 {
		device.pool.messageBufferPool.Put(msg)
	} else {
		device.pool.messageBufferReuseChan <- msg
	}
}

func (device *Device) GetInboundElement() *QueueInboundElement {
	if PreallocatedBuffersPerPool == 0 {
		return device.pool.inboundElementPool.Get().(*QueueInboundElement)
	} else {
		return <-device.pool.inboundElementReuseChan
	}
}

func (device *Device) PutInboundElement(elem *QueueInboundElement) {
	elem.clearPointers()
	if PreallocatedBuffersPerPool == 0 {
		device.pool.inboundElementPool.Put(elem)
	} else {
		device.pool.inboundElementReuseChan <- elem
	}
}

func (device *Device) GetOutboundElement() *QueueOutboundElement {
	if PreallocatedBuffersPerPool == 0 {
		return device.pool.outboundElementPool.Get().(*QueueOutboundElement)
	} else {
		return <-device.pool.outboundElementReuseChan
	}
}

func (device *Device) PutOutboundElement(elem *QueueOutboundElement) {
	elem.clearPointers()
	if PreallocatedBuffersPerPool == 0 {
		device.pool.outboundElementPool.Put(elem)
	} else {
		device.pool.outboundElementReuseChan <- elem
	}
}