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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
*/
package device
import (
"math/rand"
"runtime"
"sync"
"sync/atomic"
"testing"
"time"
)
func TestWaitPool(t *testing.T) {
var wg sync.WaitGroup
trials := int32(100000)
workers := runtime.NumCPU() + 2
if workers-4 <= 0 {
t.Skip("Not enough cores")
}
p := NewWaitPool(uint32(workers-4), func() interface{} { return make([]byte, 16) })
wg.Add(workers)
max := uint32(0)
updateMax := func() {
count := atomic.LoadUint32(&p.count)
if count > p.max {
t.Errorf("count (%d) > max (%d)", count, p.max)
}
for {
old := atomic.LoadUint32(&max)
if count <= old {
break
}
if atomic.CompareAndSwapUint32(&max, old, count) {
break
}
}
}
for i := 0; i < workers; i++ {
go func() {
defer wg.Done()
for atomic.AddInt32(&trials, -1) > 0 {
updateMax()
x := p.Get()
updateMax()
time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond)
updateMax()
p.Put(x)
updateMax()
}
}()
}
wg.Wait()
if max != p.max {
t.Errorf("Actual maximum count (%d) != ideal maximum count (%d)", max, p.max)
}
}
func BenchmarkWaitPool(b *testing.B) {
var wg sync.WaitGroup
trials := int32(b.N)
workers := runtime.NumCPU() + 2
if workers-4 <= 0 {
b.Skip("Not enough cores")
}
p := NewWaitPool(uint32(workers-4), func() interface{} { return make([]byte, 16) })
wg.Add(workers)
b.ResetTimer()
for i := 0; i < workers; i++ {
go func() {
defer wg.Done()
for atomic.AddInt32(&trials, -1) > 0 {
x := p.Get()
time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond)
p.Put(x)
}
}()
}
wg.Wait()
}
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