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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"sync"
"sync/atomic"
)
type WaitPool struct {
pool sync.Pool
cond sync.Cond
lock sync.Mutex
count atomic.Uint32
max uint32
}
func NewWaitPool(max uint32, new func() any) *WaitPool {
p := &WaitPool{pool: sync.Pool{New: new}, max: max}
p.cond = sync.Cond{L: &p.lock}
return p
}
func (p *WaitPool) Get() any {
if p.max != 0 {
p.lock.Lock()
for p.count.Load() >= p.max {
p.cond.Wait()
}
p.count.Add(1)
p.lock.Unlock()
}
return p.pool.Get()
}
func (p *WaitPool) Put(x any) {
p.pool.Put(x)
if p.max == 0 {
return
}
p.count.Add(^uint32(0))
p.cond.Signal()
}
func (device *Device) PopulatePools() {
device.pool.messageBuffers = NewWaitPool(PreallocatedBuffersPerPool, func() any {
return new([MaxMessageSize]byte)
})
device.pool.inboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any {
return new(QueueInboundElement)
})
device.pool.outboundElements = NewWaitPool(PreallocatedBuffersPerPool, func() any {
return new(QueueOutboundElement)
})
}
func (device *Device) GetMessageBuffer() *[MaxMessageSize]byte {
return device.pool.messageBuffers.Get().(*[MaxMessageSize]byte)
}
func (device *Device) PutMessageBuffer(msg *[MaxMessageSize]byte) {
device.pool.messageBuffers.Put(msg)
}
func (device *Device) GetInboundElement() *QueueInboundElement {
return device.pool.inboundElements.Get().(*QueueInboundElement)
}
func (device *Device) PutInboundElement(elem *QueueInboundElement) {
elem.clearPointers()
device.pool.inboundElements.Put(elem)
}
func (device *Device) GetOutboundElement() *QueueOutboundElement {
return device.pool.outboundElements.Get().(*QueueOutboundElement)
}
func (device *Device) PutOutboundElement(elem *QueueOutboundElement) {
elem.clearPointers()
device.pool.outboundElements.Put(elem)
}
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