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package clist
import (
"fmt"
mrand "math/rand"
"runtime"
"sync/atomic"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestPanicOnMaxLength(t *testing.T) {
maxLength := 1000
l := newWithMax(maxLength)
for i := 0; i < maxLength; i++ {
l.PushBack(1)
}
assert.Panics(t, func() {
l.PushBack(1)
})
}
func TestSmall(t *testing.T) {
l := New()
el1 := l.PushBack(1)
el2 := l.PushBack(2)
el3 := l.PushBack(3)
if l.Len() != 3 {
t.Error("Expected len 3, got ", l.Len())
}
// fmt.Printf("%p %v\n", el1, el1)
// fmt.Printf("%p %v\n", el2, el2)
// fmt.Printf("%p %v\n", el3, el3)
r1 := l.Remove(el1)
// fmt.Printf("%p %v\n", el1, el1)
// fmt.Printf("%p %v\n", el2, el2)
// fmt.Printf("%p %v\n", el3, el3)
r2 := l.Remove(el2)
// fmt.Printf("%p %v\n", el1, el1)
// fmt.Printf("%p %v\n", el2, el2)
// fmt.Printf("%p %v\n", el3, el3)
r3 := l.Remove(el3)
if r1 != 1 {
t.Error("Expected 1, got ", r1)
}
if r2 != 2 {
t.Error("Expected 2, got ", r2)
}
if r3 != 3 {
t.Error("Expected 3, got ", r3)
}
if l.Len() != 0 {
t.Error("Expected len 0, got ", l.Len())
}
}
// This test is quite hacky because it relies on SetFinalizer
// which isn't guaranteed to run at all.
//nolint:unused,deadcode
func _TestGCFifo(t *testing.T) {
if runtime.GOARCH != "amd64" {
t.Skipf("Skipping on non-amd64 machine")
}
const numElements = 1000000
l := New()
gcCount := new(uint64)
// SetFinalizer doesn't work well with circular structures,
// so we construct a trivial non-circular structure to
// track.
type value struct {
Int int
}
done := make(chan struct{})
for i := 0; i < numElements; i++ {
v := new(value)
v.Int = i
l.PushBack(v)
runtime.SetFinalizer(v, func(v *value) {
atomic.AddUint64(gcCount, 1)
})
}
for el := l.Front(); el != nil; {
l.Remove(el)
// oldEl := el
el = el.Next()
// oldEl.DetachPrev()
// oldEl.DetachNext()
}
runtime.GC()
time.Sleep(time.Second * 3)
runtime.GC()
time.Sleep(time.Second * 3)
_ = done
if *gcCount != numElements {
t.Errorf("expected gcCount to be %v, got %v", numElements,
*gcCount)
}
}
// This test is quite hacky because it relies on SetFinalizer
// which isn't guaranteed to run at all.
//nolint:unused,deadcode
func _TestGCRandom(t *testing.T) {
if runtime.GOARCH != "amd64" {
t.Skipf("Skipping on non-amd64 machine")
}
const numElements = 1000000
l := New()
gcCount := 0
// SetFinalizer doesn't work well with circular structures,
// so we construct a trivial non-circular structure to
// track.
type value struct {
Int int
}
for i := 0; i < numElements; i++ {
v := new(value)
v.Int = i
l.PushBack(v)
runtime.SetFinalizer(v, func(v *value) {
gcCount++
})
}
els := make([]*CElement, 0, numElements)
for el := l.Front(); el != nil; el = el.Next() {
els = append(els, el)
}
for _, i := range mrand.Perm(numElements) {
el := els[i]
l.Remove(el)
_ = el.Next()
}
runtime.GC()
time.Sleep(time.Second * 3)
if gcCount != numElements {
t.Errorf("expected gcCount to be %v, got %v", numElements,
gcCount)
}
}
func TestScanRightDeleteRandom(t *testing.T) {
const numElements = 1000
const numTimes = 100
const numScanners = 10
l := New()
stop := make(chan struct{})
els := make([]*CElement, numElements)
for i := 0; i < numElements; i++ {
el := l.PushBack(i)
els[i] = el
}
// Launch scanner routines that will rapidly iterate over elements.
for i := 0; i < numScanners; i++ {
go func(scannerID int) {
var el *CElement
restartCounter := 0
counter := 0
FOR_LOOP:
for {
select {
case <-stop:
fmt.Println("stopped")
break FOR_LOOP
default:
}
if el == nil {
el = l.FrontWait()
restartCounter++
}
el = el.Next()
counter++
}
fmt.Printf("Scanner %v restartCounter: %v counter: %v\n", scannerID, restartCounter, counter)
}(i)
}
// Remove an element, push back an element.
for i := 0; i < numTimes; i++ {
// Pick an element to remove
rmElIdx := mrand.Intn(len(els))
rmEl := els[rmElIdx]
// Remove it
l.Remove(rmEl)
// fmt.Print(".")
// Insert a new element
newEl := l.PushBack(-1*i - 1)
els[rmElIdx] = newEl
if i%100000 == 0 {
fmt.Printf("Pushed %vK elements so far...\n", i/1000)
}
}
// Stop scanners
close(stop)
// time.Sleep(time.Second * 1)
// And remove all the elements.
for el := l.Front(); el != nil; el = el.Next() {
l.Remove(el)
}
if l.Len() != 0 {
t.Fatal("Failed to remove all elements from CList")
}
}
func TestWaitChan(t *testing.T) {
l := New()
ch := l.WaitChan()
// 1) add one element to an empty list
go l.PushBack(1)
<-ch
// 2) and remove it
el := l.Front()
v := l.Remove(el)
if v != 1 {
t.Fatal("where is 1 coming from?")
}
// 3) test iterating forward and waiting for Next (NextWaitChan and Next)
el = l.PushBack(0)
done := make(chan struct{})
pushed := 0
go func() {
for i := 1; i < 100; i++ {
l.PushBack(i)
pushed++
time.Sleep(time.Duration(mrand.Intn(25)) * time.Millisecond)
}
// apply a deterministic pause so the counter has time to catch up
time.Sleep(25 * time.Millisecond)
close(done)
}()
next := el
seen := 0
FOR_LOOP:
for {
select {
case <-next.NextWaitChan():
next = next.Next()
seen++
if next == nil {
t.Fatal("Next should not be nil when waiting on NextWaitChan")
}
case <-done:
break FOR_LOOP
case <-time.After(10 * time.Second):
t.Fatal("max execution time")
}
}
if pushed != seen {
t.Fatalf("number of pushed items (%d) not equal to number of seen items (%d)", pushed, seen)
}
// 4) test iterating backwards (PrevWaitChan and Prev)
prev := next
seen = 0
FOR_LOOP2:
for {
select {
case <-prev.PrevWaitChan():
prev = prev.Prev()
seen++
if prev == nil {
t.Fatal("expected PrevWaitChan to block forever on nil when reached first elem")
}
case <-time.After(3 * time.Second):
break FOR_LOOP2
}
}
if pushed != seen {
t.Fatalf("number of pushed items (%d) not equal to number of seen items (%d)", pushed, seen)
}
}