func main() {
give := make(chan []byte)
get := make(chan []byte)
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
q.PushFront(make([]byte, 100))
}
e := q.Front()
select {
case s := <-give:
q.PushFront(s)
case get <- e.Value.([]byte):
q.Remove(e)
}
}
}()
// Gets a new buffer from the recycler.
buffer := <-get
// Give it back to the recycler.
give <- buffer
// Get the recycled buffer again.
buffer = <-get
}
func StackSpec(c Context) {
stack := new(list.List)
c.Specify("An empty stack", func() {
c.Specify("contains no elements", func() {
c.Expect(stack.Len()).Equals(0)
})
})
c.Specify("When elements are pushed onto a stack", func() {
stack.PushFront("pushed first")
stack.PushFront("pushed last")
c.Specify("then it contains some elements", func() {
c.Expect(stack.Len()).NotEquals(0)
})
c.Specify("the element pushed last is popped first", func() {
poppedFirst := stack.Remove(stack.Front())
c.Expect(poppedFirst).Equals("pushed last")
})
c.Specify("the element pushed first is popped last", func() {
stack.Remove(stack.Front())
poppedLast := stack.Remove(stack.Front())
c.Expect(poppedLast).Equals("pushed first")
})
})
}
func houseKeeping(get, give chan interface{},
factory func() interface{}) {
q := new(list.List)
for {
if q.Len() == 0 {
atomic.AddInt64(&makes, 1)
q.PushFront(queued{when: time.Now(), data: factory()})
}
element := q.Front()
timeout := time.NewTimer(time.Minute)
select {
case b := <-give:
timeout.Stop()
q.PushFront(queued{when: time.Now(), data: b})
case get <- element.Value.(queued).data:
timeout.Stop()
q.Remove(element)
case <-timeout.C:
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(queued).when) > time.Minute {
q.Remove(e)
e.Value = nil
}
e = n
}
}
}
}
func CreateObject(l *list.List, newId, protectorId *protected_objects.ObjectIdMessage,
encKey *tao.Keys, program *auth.Prin, domain *tao.Domain, newType string,
newVal []byte) error {
if !domain.Guard.IsAuthorized(*program, "CREATE", []string{protectorId.String()}) {
return errors.New("program not authorized to create requested secret")
}
_, _, err := readObjRec(l, encKey, newId)
if err == nil {
return errors.New("creating object with existing id")
}
protectorType, protectorKey, err := readObjRec(l, encKey, protectorId)
if err != nil {
return err
}
if *protectorType != "key" {
return errors.New("creating object protected by object type not key")
}
new := protected_objects.ObjectMessage{
ObjId: newId,
ObjVal: newVal,
ObjType: &newType}
pNew, err := protected_objects.MakeProtectedObject(new, *protectorId.ObjName,
*protectorId.ObjEpoch, protectorKey)
l.PushFront(*pNew)
return nil
}
func Insert(e Elem, L *list.List) int {
if L.Len() == 0 {
L.PushFront(e)
return L.Len()
}
front := L.Front()
if e.GetTime() < front.Value.(Elem).GetTime() {
L.InsertBefore(e, front)
return L.Len()
}
el := L.Back()
Loop:
for {
if el.Value.(Elem).GetTime() > e.GetTime() {
el = el.Prev()
} else {
break Loop
}
}
L.InsertAfter(e, el)
return L.Len()
}
func bufferRecycler(give, get chan *bytes.Buffer) {
q := new(list.List)
for {
//This means that we are getting more than we are giving and memory is not being
//cleaned up properly
if q.Len() > 1000 {
log.Warnf("Memory Recycler Overload (high memory use): %d", q.Len())
}
if q.Len() == 0 {
q.PushFront(&bytes.Buffer{})
}
e := q.Front()
select {
case s := <-give:
s.Reset()
q.PushFront(s)
case get <- e.Value.(*bytes.Buffer):
q.Remove(e)
}
}
}
func recycler(give, get chan []byte) {
q := new(list.List)
for {
//This means that we are getting more than we are giving and memory is not being
//cleaned up properly
if q.Len() > 1000 {
log.Warnf("Memory Recycler Overload (high memory use): %d", q.Len())
}
if q.Len() == 0 {
q.PushFront(make([]byte, defaultMemorySize))
}
e := q.Front()
select {
case s := <-give:
q.PushFront(s[:0])
case get <- e.Value.([]byte):
q.Remove(e)
}
}
}
func (server *Server) buildArgumentsTrim(arguments *list.List, params imageserver.Params) error {
trim, _ := params.GetBool("trim")
if trim {
// We must execute trim first. (order of operations)
arguments.PushFront("-trim")
}
return nil
}
func HandleResponse(r *ReplyInfo, completed *int, jobs *list.List) {
if r.OK {
//add to our completed count
*completed++
} else {
//add job back to queue, it failed.
jobs.PushFront(r.job)
}
}
func dfsrp(g *Digraph, s int, marked map[int]bool, l *list.List) {
marked[s] = true
for _, v := range g.Adj(s) {
if !marked[v.vertex] {
dfsrp(g, v.vertex, marked, l)
}
}
l.PushFront(s) // Reverse post
}
func Bish_mech(bpos pos) list.List {
options := list.List{}
// positions of the form row+i,col+i, where i is (TODO: fix this)> -min(row,col) and <
// for now lazy implementation that will have options removed as out of board later
for i := -7; i < 8; i++ {
options.PushFront(pos{bpos.row + i, bpos.col + i})
}
return options
}
func Pawn_mech(ppos pos) list.List {
options := list.List{}
// +1 fwd, TODO: +2 fwd if on homeRow
// TODO: en passant
options.PushFront(pos{ppos.row + 1, ppos.col})
// pawn attack
options.PushFront(pos{ppos.row + 1, ppos.col + 1})
options.PushFront(pos{ppos.row + 1, ppos.col - 1})
return options
}
// Add the indicated protected object to the list.
func AddObject(l *list.List, obj ObjectMessage) error {
for e := l.Front(); e != nil; e = e.Next() {
o := e.Value.(ObjectMessage)
if o.ObjId.ObjName == obj.ObjId.ObjName && o.ObjId.ObjEpoch == obj.ObjId.ObjEpoch {
return nil
}
}
l.PushFront(interface{}(obj))
return nil
}
func King_mech(kpos pos) list.List {
options := list.List{}
// TODO: casteling, requires remembering if King ever has been in check
for a := -1; a < 2; a++ {
for b := -1; b < 2; b++ {
options.PushFront(pos{kpos.row + a, kpos.col + b})
// TODO: remove no-move move, (a=0,b=0)
}
}
return options
}
func Rook_mech(rpos pos) list.List {
options := list.List{}
for newCol := 1; newCol < 9; newCol++ {
options.PushFront(pos{rpos.row, newCol})
}
for newRow := 1; newRow < 9; newRow++ {
options.PushFront(pos{newRow, rpos.col})
}
//TODO: this will include current position twice and should have current position removed from options by filtering!
return options
}
//重用client结构
func MakeMessageRecycler() (get, put chan *Message) {
get = make(chan *Message)
put = make(chan *Message)
go func() {
queue := new(list.List)
for {
if queue.Len() == 0 {
queue.PushFront(MessageQueued{
when: time.Now(),
message: &Message{},
})
}
ct := queue.Front()
timeout := time.NewTimer(time.Minute)
select {
case b := <-put:
timeout.Stop()
b.Mid = 0
b.Uid = 0
b.Content = ""
b.Type = 0
b.Time = 0
b.From = 0
b.To = 0
b.Group = 0
mq := MessageQueued{
when: time.Now(),
message: b,
}
queue.PushFront(mq)
case get <- ct.Value.(MessageQueued).message:
timeout.Stop()
queue.Remove(ct)
case <-timeout.C:
ct := queue.Front()
for ct != nil {
n := ct.Next()
if time.Since(ct.Value.(MessageQueued).when) > time.Minute {
queue.Remove(ct)
ct.Value = nil
}
ct = n
}
}
}
}()
return
}
func makeApplication(exprs *list.List) (result Expression) {
switch len := exprs.Len(); true {
case len >= 2:
x1,_ := listPopFront(exprs).(Expression);
x2,_ := listPopFront(exprs).(Expression);
exprs.PushFront(Application{x1,x2});
result = makeApplication(exprs);
case len == 1:
result,_ = listPopFront(exprs).(Expression);
}
return;
}
func TestList(t *testing.T) {
var myInstance *MyType
myInstance = new(MyType)
myInstance.name = "hello"
var myList list.List
myList.Init()
myList.PushFront(myInstance)
x := myList.Front().Value.(*MyType)
fmt.Println((*x).name)
}
//notifyExpired func
func (self *TimeWheel) notifyExpired(idx int) {
var remove *list.List
self.lock.RLock()
slots := self.wheel[idx]
for e := slots.hooks.Back(); nil != e; e = e.Prev() {
sj := e.Value.(*slotJob)
sj.ttl--
//ttl expired
if sj.ttl <= 0 {
if nil == remove {
remove = list.New()
}
//记录删除
remove.PushFront(e)
self.slotJobWorkers <- true
//async
go func() {
defer func() {
if err := recover(); nil != err {
//ignored
log.Error("TimeWheel|notifyExpired|Do|ERROR|%s\n", err)
}
<-self.slotJobWorkers
}()
sj.do()
sj.ch <- true
close(sj.ch)
// log.Debug("TimeWheel|notifyExpired|%d\n", sj.ttl)
}()
}
}
self.lock.RUnlock()
if nil != remove {
//remove
for e := remove.Back(); nil != e; e = e.Prev() {
re := e.Value.(*list.Element)
self.lock.Lock()
slots.hooks.Remove(e.Value.(*list.Element))
delete(self.hashWheel, re.Value.(*slotJob).id)
self.lock.Unlock()
}
}
}
func verifyImagesAreRemoved(imageManager *dockerImageManager, imageIds ...string) error {
var imagesNotRemovedList *list.List = list.New()
for _, imageId := range imageIds {
_, ok := imageManager.getImageState(imageId)
if ok {
imagesNotRemovedList.PushFront(imageId)
}
}
if imagesNotRemovedList.Len() > 0 {
return errors.New(fmt.Sprintf("Image states still exist for: %v", imagesNotRemovedList))
} else {
return nil
}
}
func verifyImagesAreNotRemoved(imageManager *dockerImageManager, imageIds ...string) error {
var imagesRemovedList *list.List = list.New()
for _, imageId := range imageIds {
_, ok := imageManager.getImageState(imageId)
if !ok {
imagesRemovedList.PushFront(imageId)
}
}
if imagesRemovedList.Len() > 0 {
return errors.New(fmt.Sprintf("Could not find images: %v in ImageManager", imagesRemovedList))
} else {
return nil
}
}
func bufferPool(bufsz int64) (sp *bp) {
sp = &bp{
get: make(chan []byte),
give: make(chan []byte),
quit: make(chan struct{}),
timeout: time.Minute,
sizech: make(chan int64),
}
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
q.PushFront(qb{when: time.Now(), s: make([]byte, bufsz)})
sp.makes++
}
e := q.Front()
timeout := time.NewTimer(sp.timeout)
select {
case b := <-sp.give:
timeout.Stop()
q.PushFront(qb{when: time.Now(), s: b})
case sp.get <- e.Value.(qb).s:
timeout.Stop()
q.Remove(e)
case <-timeout.C:
// free unused slices older than timeout
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(qb).when) > sp.timeout {
q.Remove(e)
e.Value = nil
}
e = n
}
case sz := <-sp.sizech: // update buffer size, free buffers
bufsz = sz
case <-sp.quit:
logger.debugPrintf("%d buffers of %d MB allocated", sp.makes, bufsz/(1*mb))
return
}
}
}()
return sp
}
func newBufferPool(bufsz int64) (np *bp) {
np = &bp{
get: make(chan *bytes.Buffer),
give: make(chan *bytes.Buffer),
quit: make(chan struct{}),
timeout: time.Minute,
}
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
size := bufsz + 100*kb // allocate overhead to avoid slice growth
q.PushFront(qBuf{when: time.Now(), buffer: bytes.NewBuffer(makeBuffer(int64(size)))})
np.makes++
}
e := q.Front()
timeout := time.NewTimer(np.timeout)
select {
case b := <-np.give:
timeout.Stop()
q.PushFront(qBuf{when: time.Now(), buffer: b})
case np.get <- e.Value.(qBuf).buffer:
timeout.Stop()
q.Remove(e)
case <-timeout.C:
// free unused buffers
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(qBuf).when) > np.timeout {
q.Remove(e)
e.Value = nil
}
e = n
}
case <-np.quit:
logger.debugPrintf("%d buffers of %d MB allocated", np.makes, bufsz/(1*mb))
return
}
}
}()
return np
}
func New(alloc func(size, acap int64) interface{}, size, acap int64, timeout time.Duration) (as *Pool) {
as = &Pool{Take: make(chan interface{}), Give: make(chan interface{}),
Size: make(chan int64), Quit: make(chan struct{}), Exit: make(chan struct{}), size: size, acap: acap}
// timeout: timeout) // size: size, acap: acap}
// start buffer manager
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
b := alloc(as.size, as.acap)
//fmt.Printf("Make: len=%d, cap=%d, cnt=%d, qlen=%d\n", len(s), cap(s), as.Cnt, q.Len())
q.PushFront(qb{when: time.Now(), b: b})
as.Cnt++
}
e := q.Front()
timeout := time.NewTimer(as.timeout)
select {
case b := <-as.Give:
timeout.Stop()
//fmt.Printf("Give: len=%d, cap=%d, cnt=%d, qlen=%d\n", len(b), cap(b), as.Cnt, q.Len())
q.PushFront(qb{when: time.Now(), b: b})
case as.Take <- e.Value.(qb).b:
//fmt.Printf("Take: cnt=%d, qlen=%d\n", as.Cnt, q.Len())
timeout.Stop()
q.Remove(e)
case <-timeout.C:
// free unused slices older than timeout
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(qb).when) > as.timeout {
q.Remove(e)
e.Value = nil
}
e = n
}
case sz := <-as.Size: // update buffer size, free buffers
as.size = sz
case <-as.Quit:
fmt.Printf("autobuf: Cnt=%d\n", as.Cnt)
as.Exit <- struct{}{}
return
}
}
}()
return as
}
/* Make the recycler. Any buffer in the pool (queue) that is older than
a minute is considered unlikely to be used again and can be
discarded */
func makeRecycler() (get, give chan []byte) {
get = make(chan []byte) // Channel to get buffers from the pool
give = make(chan []byte) // Channel to give buffers back to the pool
// Start function as a goroutine
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
// If the queue is empty, create a new buffer and add it to the queue
q.PushFront(queued{when: time.Now(), slice: makeBuffer()})
}
e := q.Front()
// Start a 1 minute long timer
timeout := time.NewTimer(time.Minute)
select {
// If there is a buffer in give, add it to the queue
case b := <-give:
timeout.Stop()
q.PushFront(queued{when: time.Now(), slice: b})
// If there is a buffer in queue, send it to the get channel
case get <- e.Value.(queued).slice:
timeout.Stop()
q.Remove(e)
// Time is up! Any buffer older than a minute is discarded.
case <-timeout.C:
// Go through list checking if creation time is more than 1 minute ago
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(queued).when) > time.Minute {
q.Remove(e)
e.Value = nil
}
e = n
}
}
}
}() // Start function as a goroutine with no params
return // Return the get and give channels (named return values)
}
func newBufferPool(bufsz int64) (np *bp) {
np = new(bp)
np.get = make(chan *bytes.Buffer)
np.give = make(chan *bytes.Buffer)
np.quit = make(chan bool)
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
size := bufsz + 100*1024 // allocate overhead to avoid slice growth
q.PushFront(qBuf{when: time.Now(), buffer: bytes.NewBuffer(makeBuffer(int64(size)))})
np.makes++
}
e := q.Front()
timeout := time.NewTimer(time.Minute)
select {
case b := <-np.give:
timeout.Stop()
q.PushFront(qBuf{when: time.Now(), buffer: b})
case np.get <- e.Value.(qBuf).buffer:
timeout.Stop()
q.Remove(e)
case <-timeout.C:
// free unused buffers
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(qBuf).when) > time.Minute {
q.Remove(e)
e.Value = nil
}
e = n
}
case <-np.quit:
debugf("%d buffers of %d MB allocated", np.makes, bufsz/(1*1024*1024))
return
}
}
}()
return np
}
// DocIdsMaker function description : DocId的内存池
// params :
// return :
func DocIdsMaker() (get, give chan []DocIdNode) {
get = make(chan []DocIdNode)
give = make(chan []DocIdNode)
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
q.PushFront(queued{when: time.Now(), slice: makeDocIdSlice()})
}
e := q.Front()
timeout := time.NewTimer(time.Minute)
select {
case b := <-give:
timeout.Stop()
//fmt.Printf("Recive Buffer...\n")
//b=b[:MAX_DOCID_LEN]
q.PushFront(queued{when: time.Now(), slice: b})
case get <- e.Value.(queued).slice[:0]:
timeout.Stop()
//fmt.Printf("Sent Buffer...\n")
q.Remove(e)
case <-timeout.C:
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(queued).when) > time.Minute {
q.Remove(e)
e.Value = nil
}
e = n
}
}
}
}()
return
}
func (p *putter) makeRecycler() (get, give chan *bytes.Buffer) {
get = make(chan *bytes.Buffer)
give = make(chan *bytes.Buffer)
go func() {
q := new(list.List)
for {
if q.Len() == 0 {
size := p.bufsz + 1*kb
q.PushFront(queued{when: time.Now(), buffer: bytes.NewBuffer(makeBuffer(int64(size)))})
//q.PushFront(queued{when: time.Now(), buffer: bytes.NewBuffer(nil)})
//log.Println("Make buffer:", size)
p.makes++
}
e := q.Front()
timeout := time.NewTimer(time.Minute)
select {
case b := <-give:
timeout.Stop()
q.PushFront(queued{when: time.Now(), buffer: b})
q_len_max = max(q_len_max, q.Len())
case get <- e.Value.(queued).buffer:
timeout.Stop()
q.Remove(e)
// free unused buffers
case <-timeout.C:
e := q.Front()
for e != nil {
n := e.Next()
if time.Since(e.Value.(queued).when) > time.Minute {
q.Remove(e)
e.Value = nil
}
e = n
}
}
}
}()
return
}
func (b *bfs) shortestPath() *list.List {
marked := make([]bool, b.graph.vertices)
edgeTo := make([]int, b.graph.vertices)
queue := new(queue)
targetFound := false
var target int
queue.enqueue(b.initVertice)
marked[b.initVertice] = true
for queue.size > 0 && !targetFound {
currentVertice := queue.dequeue().(int)
adjacents := b.graph.adjacents(currentVertice)
for e := adjacents.Front(); e != nil; e = e.Next() {
v := e.Value.(int)
if !marked[v] {
marked[v] = true
edgeTo[v] = currentVertice
queue.enqueue(v)
}
if _, ok := b.targetVertices[v]; ok {
targetFound = true
target = v
}
}
}
result := new(list.List)
if targetFound {
result.PushFront(target)
for v := edgeTo[target]; v != b.initVertice; v = edgeTo[v] {
result.PushFront(v)
}
}
return result
}
func BatchManager(getBatches, returnBatches chan *Batch, stats chan<- NamedValue, config *ShuttleConfig) {
q := new(list.List)
ticker := time.Tick(time.Minute)
for {
if q.Len() == 0 {
q.PushFront(queued{when: time.Now(), batch: NewBatch(config)})
}
e := q.Front()
select {
case batch := <-returnBatches:
//I've been given a batch back, queue it
stats <- NewNamedValue("batch.msg.age.range", batch.MsgAgeRange())
batch.Reset()
q.PushFront(queued{when: time.Now(), batch: batch})
case getBatches <- e.Value.(queued).batch:
//I've sent the current batch out, remove it from the queue
q.Remove(e)
case <-ticker:
//Periodically go through the queued batches and throw
//out ones that have been queued for too long in an effort
//to expire old batches that were created because of bursts
stats <- NewNamedValue("batch-manager.list.length", float64(q.Len()))
removed := 0
for e := q.Front(); e != nil; e = e.Next() {
age := time.Since(e.Value.(queued).when)
if age > time.Minute {
removed += 1
q.Remove(e)
e.Value = nil
}
stats <- NewNamedValue("batch-manager.batch.queued.age", age.Seconds())
}
stats <- NewNamedValue("batch-manager.list.removed", float64(removed))
}
}
}