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nps
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add test code

pull/265/head
ffdfgdfg 2019-10-23 23:35:39 +08:00
parent 23b023c562
commit 442354db17
4 changed files with 300 additions and 161 deletions
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93
lib/mux/conn.go
View File

@ -2,7 +2,6 @@ package mux
import (
"errors"
"github.com/astaxie/beego/logs"
"io"
"net"
"strconv"
@ -178,21 +177,17 @@ func (Self *ReceiveWindow) New(mux *Mux) {
Self.window.New()
}
func (Self *ReceiveWindow) RemainingSize() (n uint32) {
func (Self *ReceiveWindow) remainingSize() (n uint32) {
// receive window remaining
if Self.maxSize >= Self.bufQueue.Len() {
n = Self.maxSize - Self.bufQueue.Len()
}
// if maxSize is small than bufQueue length, return 0
return
return Self.maxSize - Self.bufQueue.Len()
}
func (Self *ReceiveWindow) ReadSize() (n uint32) {
func (Self *ReceiveWindow) readSize() (n uint32) {
// acknowledge the size already read
return atomic.SwapUint32(&Self.readLength, 0)
}
func (Self *ReceiveWindow) CalcSize() {
func (Self *ReceiveWindow) calcSize() {
// calculating maximum receive window size
if Self.count == 0 {
//logs.Warn("ping, bw", Self.mux.latency, Self.bw.Get())
@ -222,22 +217,22 @@ func (Self *ReceiveWindow) Write(buf []byte, l uint16, part bool, id int32) (err
if Self.closeOp {
return errors.New("conn.receiveWindow: write on closed window")
}
element := ListElement{}
element := new(ListElement)
err = element.New(buf, l, part)
//logs.Warn("push the buf", len(buf), l, (&element).l)
if err != nil {
return
}
Self.bufQueue.Push(&element) // must push data before allow read
Self.bufQueue.Push(element) // must push data before allow read
//logs.Warn("read session calc size ", Self.maxSize)
// calculating the receive window size
Self.CalcSize()
Self.calcSize()
//logs.Warn("read session calc size finish", Self.maxSize)
if Self.RemainingSize() == 0 {
if Self.remainingSize() == 0 {
Self.windowFull = true
//logs.Warn("window full true", Self.windowFull)
}
Self.mux.sendInfo(common.MUX_MSG_SEND_OK, id, Self.maxSize, Self.ReadSize())
Self.mux.sendInfo(common.MUX_MSG_SEND_OK, id, Self.maxSize, Self.readSize())
return nil
}
@ -273,10 +268,10 @@ copyData:
n += l
l = 0
//Self.bw.EndRead()
Self.sendStatus(id)
if Self.off == uint32(Self.element.l) {
//logs.Warn("put the element end ", string(Self.element.buf[:15]))
common.WindowBuff.Put(Self.element.buf)
Self.sendStatus(id)
}
if pOff < len(p) && Self.element.part {
// element is a part of the segments, trying to fill up buf p
@ -289,7 +284,7 @@ func (Self *ReceiveWindow) sendStatus(id int32) {
if Self.windowFull || Self.bufQueue.Len() == 0 {
// window is full before read or empty now
Self.windowFull = false
Self.mux.sendInfo(common.MUX_MSG_SEND_OK, id, Self.maxSize, Self.ReadSize())
Self.mux.sendInfo(common.MUX_MSG_SEND_OK, id, Self.maxSize, Self.readSize())
// acknowledge other side, have empty some receive window space
//}
}
@ -314,11 +309,10 @@ type SendWindow struct {
buf []byte
sentLength uint32
setSizeCh chan struct{}
setSizeWait bool
setSizeWait int32
unSlide uint32
timeout time.Time
window
mutex sync.Mutex
}
func (Self *SendWindow) New(mux *Mux) {
@ -330,17 +324,12 @@ func (Self *SendWindow) New(mux *Mux) {
func (Self *SendWindow) SetSendBuf(buf []byte) {
// send window buff from conn write method, set it to send window
Self.mutex.Lock()
Self.buf = buf
Self.off = 0
Self.mutex.Unlock()
}
func (Self *SendWindow) RemainingSize() (n uint32) {
if Self.maxSize >= Self.sentLength {
n = Self.maxSize - Self.sentLength
}
return
return atomic.LoadUint32(&Self.maxSize) - atomic.LoadUint32(&Self.sentLength)
}
func (Self *SendWindow) SetSize(windowSize, readLength uint32) (closed bool) {
@ -353,25 +342,21 @@ func (Self *SendWindow) SetSize(windowSize, readLength uint32) (closed bool) {
close(Self.setSizeCh)
return true
}
if readLength == 0 && Self.maxSize == windowSize {
if readLength == 0 && atomic.LoadUint32(&Self.maxSize) == windowSize {
//logs.Warn("waiting for another window size")
return false // waiting for receive another usable window size
}
//logs.Warn("set send window size to ", windowSize, readLength)
Self.mutex.Lock()
Self.slide(windowSize, readLength)
if Self.setSizeWait {
if Self.RemainingSize() == 0 {
//logs.Warn("waiting for another window size after slide")
// keep the wait status
atomic.StoreInt32(&Self.setSizeWait, 1)
return false
}
if atomic.CompareAndSwapInt32(&Self.setSizeWait, 1, 0) {
// send window into the wait status, need notice the channel
//logs.Warn("send window remaining size is 0 , wait")
if Self.RemainingSize() == 0 {
//logs.Warn("waiting for another window size after slide")
// keep the wait status
Self.mutex.Unlock()
return false
}
Self.setSizeWait = false
Self.mutex.Unlock()
//logs.Warn("send window remaining size is 0 starting wait")
select {
case Self.setSizeCh <- struct{}{}:
//logs.Warn("send window remaining size is 0 finish")
@ -382,43 +367,36 @@ func (Self *SendWindow) SetSize(windowSize, readLength uint32) (closed bool) {
}
}
// send window not into the wait status, so just do slide
Self.mutex.Unlock()
return false
}
func (Self *SendWindow) slide(windowSize, readLength uint32) {
Self.sentLength -= readLength
Self.maxSize = windowSize
atomic.AddUint32(&Self.sentLength, ^readLength-1)
atomic.SwapUint32(&Self.maxSize, windowSize)
}
func (Self *SendWindow) WriteTo() (p []byte, part bool, err error) {
func (Self *SendWindow) WriteTo() (p []byte, sendSize uint32, part bool, err error) {
// returns buf segments, return only one segments, need a loop outside
// until err = io.EOF
if Self.closeOp {
return nil, false, errors.New("conn.writeWindow: window closed")
return nil, 0, false, errors.New("conn.writeWindow: window closed")
}
if Self.off == uint32(len(Self.buf)) {
return nil, false, io.EOF
return nil, 0, false, io.EOF
// send window buff is drain, return eof and get another one
}
Self.mutex.Lock()
if Self.RemainingSize() == 0 {
Self.setSizeWait = true
Self.mutex.Unlock()
atomic.StoreInt32(&Self.setSizeWait, 1)
// into the wait status
err = Self.waitReceiveWindow()
if err != nil {
return nil, false, err
return nil, 0, false, err
}
} else {
Self.mutex.Unlock()
}
Self.mutex.Lock()
var sendSize uint32
if len(Self.buf[Self.off:]) > common.MAXIMUM_SEGMENT_SIZE {
sendSize = common.MAXIMUM_SEGMENT_SIZE
part = true
logs.Warn("cut buf by mss")
//logs.Warn("cut buf by mss")
} else {
sendSize = uint32(len(Self.buf[Self.off:]))
part = false
@ -427,14 +405,13 @@ func (Self *SendWindow) WriteTo() (p []byte, part bool, err error) {
// usable window size is small than
// window MAXIMUM_SEGMENT_SIZE or send buf left
sendSize = Self.RemainingSize()
logs.Warn("cut buf by remainingsize", sendSize, len(Self.buf[Self.off:]))
//logs.Warn("cut buf by remainingsize", sendSize, len(Self.buf[Self.off:]))
part = true
}
//logs.Warn("send size", sendSize)
p = Self.buf[Self.off : sendSize+Self.off]
Self.off += sendSize
Self.sentLength += sendSize
Self.mutex.Unlock()
atomic.AddUint32(&Self.sentLength, sendSize)
return
}
@ -463,8 +440,9 @@ func (Self *SendWindow) WriteFull(buf []byte, id int32) (n int, err error) {
Self.SetSendBuf(buf) // set the buf to send window
var bufSeg []byte
var part bool
var l uint32
for {
bufSeg, part, err = Self.WriteTo()
bufSeg, l, part, err = Self.WriteTo()
//logs.Warn("buf seg", len(bufSeg), part, err)
// get the buf segments from send window
if bufSeg == nil && part == false && err == io.EOF {
@ -475,7 +453,8 @@ func (Self *SendWindow) WriteFull(buf []byte, id int32) (n int, err error) {
if err != nil {
break
}
n += len(bufSeg)
n += int(l)
l = 0
if part {
Self.mux.sendInfo(common.MUX_NEW_MSG_PART, id, bufSeg)
} else {

6
lib/mux/mux.go
View File

@ -41,7 +41,7 @@ func NewMux(c net.Conn, connType string) *Mux {
connMap: NewConnMap(),
id: 0,
closeChan: make(chan struct{}, 3),
newConnCh: make(chan *conn),
newConnCh: make(chan *conn, 10),
bw: new(bandwidth),
IsClose: false,
connType: connType,
@ -321,11 +321,11 @@ func (s *Mux) Close() error {
func (s *Mux) getId() (id int32) {
//Avoid going beyond the scope
if (math.MaxInt32 - s.id) < 10000 {
atomic.SwapInt32(&s.id, 0)
atomic.StoreInt32(&s.id, 0)
}
id = atomic.AddInt32(&s.id, 1)
if _, ok := s.connMap.Get(id); ok {
s.getId()
return s.getId()
}
return
}

330
lib/mux/mux_test.go
View File

@ -3,19 +3,18 @@ package mux
import (
"bufio"
"fmt"
"io"
"github.com/cnlh/nps/lib/common"
"log"
"net"
"net/http"
"net/http/httputil"
_ "net/http/pprof"
"strconv"
"sync"
"testing"
"time"
"unsafe"
"github.com/astaxie/beego/logs"
"github.com/cnlh/nps/lib/common"
)
var conn1 net.Conn
@ -49,42 +48,42 @@ func TestNewMux(t *testing.T) {
//c2.(*net.TCPConn).SetReadBuffer(0)
//c2.(*net.TCPConn).SetReadBuffer(0)
go func(c2 net.Conn, c *conn) {
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
_, err = common.CopyBuffer(c2, c)
if err != nil {
c2.Close()
c.Close()
logs.Warn("close npc by copy from nps", err, c.connId)
}
wg.Done()
}()
wg.Add(1)
go func() {
_, err = common.CopyBuffer(c, c2)
if err != nil {
c2.Close()
c.Close()
logs.Warn("close npc by copy from server", err, c.connId)
}
wg.Done()
}()
//logs.Warn("npc wait")
wg.Wait()
//wg := sync.WaitGroup{}
//wg.Add(1)
//go func() {
// _, err = common.CopyBuffer(c2, c)
// if err != nil {
// c2.Close()
// c.Close()
// logs.Warn("close npc by copy from nps", err, c.connId)
// }
// wg.Done()
//}()
//wg.Add(1)
//go func() {
// _, err = common.CopyBuffer(c, c2)
// if err != nil {
// c2.Close()
// c.Close()
// logs.Warn("close npc by copy from server", err, c.connId)
// }
// wg.Done()
//}()
////logs.Warn("npc wait")
//wg.Wait()
}(c2, c.(*conn))
}
}()
go func() {
m1 := NewMux(conn1, "tcp")
//m1 := NewMux(conn1, "tcp")
l, err := net.Listen("tcp", "127.0.0.1:7777")
if err != nil {
logs.Warn(err)
}
for {
//logs.Warn("nps starting accept")
conns, err := l.Accept()
_, err := l.Accept()
if err != nil {
logs.Warn(err)
continue
@ -92,37 +91,37 @@ func TestNewMux(t *testing.T) {
//conns.(*net.TCPConn).SetReadBuffer(0)
//conns.(*net.TCPConn).SetReadBuffer(0)
//logs.Warn("nps accept success starting new conn")
tmpCpnn, err := m1.NewConn()
if err != nil {
logs.Warn("nps new conn err ", err)
continue
}
logs.Warn("nps new conn success ", tmpCpnn.connId)
go func(tmpCpnn *conn, conns net.Conn) {
go func() {
_, err := common.CopyBuffer(tmpCpnn, conns)
if err != nil {
conns.Close()
tmpCpnn.Close()
logs.Warn("close nps by copy from user", tmpCpnn.connId, err)
}
}()
//time.Sleep(time.Second)
_, err = common.CopyBuffer(conns, tmpCpnn)
if err != nil {
conns.Close()
tmpCpnn.Close()
logs.Warn("close nps by copy from npc ", tmpCpnn.connId, err)
}
}(tmpCpnn, conns)
//tmpCpnn, err := m1.NewConn()
//if err != nil {
// logs.Warn("nps new conn err ", err)
// continue
//}
////logs.Warn("nps new conn success ", tmpCpnn.connId)
//go func(tmpCpnn *conn, conns net.Conn) {
// //go func() {
// // _, err := common.CopyBuffer(tmpCpnn, conns)
// // if err != nil {
// // conns.Close()
// // tmpCpnn.Close()
// // logs.Warn("close nps by copy from user", tmpCpnn.connId, err)
// // }
// //}()
// ////time.Sleep(time.Second)
// //_, err = common.CopyBuffer(conns, tmpCpnn)
// //if err != nil {
// // conns.Close()
// // tmpCpnn.Close()
// // logs.Warn("close nps by copy from npc ", tmpCpnn.connId, err)
// //}
//}(tmpCpnn, conns)
}
}()
go NewLogServer()
time.Sleep(time.Second * 5)
//for i:=0;i<1000;i++ {
// go test_raw(i)
//}
for i := 0; i < 1000; i++ {
go test_raw(i)
}
for {
time.Sleep(time.Second * 5)
@ -180,37 +179,37 @@ Connection: keep-alive
func test_raw(k int) {
for i := 0; i < 1; i++ {
ti := time.Now()
conn, _ := net.Dial("tcp", "127.0.0.1:7777")
_, _ = net.Dial("tcp", "127.0.0.1:7777")
tid := time.Now()
conn.Write([]byte(`GET / HTTP/1.1
Host: 127.0.0.1:7777
`))
tiw := time.Now()
buf := make([]byte, 3572)
n, err := io.ReadFull(conn, buf)
//n, err := conn.Read(buf)
if err != nil {
logs.Warn("close by read response err", err)
break
}
//logs.Warn(n, string(buf[:50]), "\n--------------\n", string(buf[n-50:n]))
//time.Sleep(time.Second)
err = conn.Close()
if err != nil {
logs.Warn("close conn err ", err)
}
// conn.Write([]byte(`GET / HTTP/1.1
//Host: 127.0.0.1:7777
//
//
//`))
// tiw := time.Now()
//buf := make([]byte, 3572)
//n, err := io.ReadFull(conn, buf)
////n, err := conn.Read(buf)
//if err != nil {
// logs.Warn("close by read response err", err)
// break
//}
////logs.Warn(n, string(buf[:50]), "\n--------------\n", string(buf[n-50:n]))
////time.Sleep(time.Second)
//err = conn.Close()
//if err != nil {
// logs.Warn("close conn err ", err)
//}
now := time.Now()
du := now.Sub(ti).Seconds()
dud := now.Sub(tid).Seconds()
duw := now.Sub(tiw).Seconds()
if du > 1 {
logs.Warn("duration long", du, dud, duw, k, i)
}
if n != 3572 {
logs.Warn("n loss", n, string(buf))
}
//duw := now.Sub(tiw).Seconds()
//if du > 1 {
logs.Warn("duration long", du, dud, k, i)
//}
//if n != 3572 {
// logs.Warn("n loss", n, string(buf))
//}
}
}
@ -249,29 +248,182 @@ func TestDQueue(t *testing.T) {
}
func TestChain(t *testing.T) {
go func() {
log.Println(http.ListenAndServe("0.0.0.0:8889", nil))
}()
logs.EnableFuncCallDepth(true)
logs.SetLogFuncCallDepth(3)
time.Sleep(time.Second * 5)
d := new(bufChain)
d.new(256)
go func() {
time.Sleep(time.Second)
for i := 0; i < 1000; i++ {
for i := 0; i < 30000; i++ {
unsa, ok := d.popTail()
str := (*string)(unsa)
if ok {
logs.Warn(i, str, *str, ok)
fmt.Println(i, str, *str, ok)
//logs.Warn(i, str, *str, ok)
} else {
logs.Warn("nil", i, ok)
fmt.Println("nil", i, ok)
//logs.Warn("nil", i, ok)
}
}
}()
go func() {
time.Sleep(time.Second)
for i := 0; i < 1000; i++ {
data := "test " + strconv.Itoa(i)
logs.Warn(data, unsafe.Pointer(&data))
go d.pushHead(unsafe.Pointer(&data))
for i := 0; i < 3000; i++ {
go func(i int) {
for n := 0; n < 10; n++ {
data := "test " + strconv.Itoa(i) + strconv.Itoa(n)
fmt.Println(data, unsafe.Pointer(&data))
//logs.Warn(data, unsafe.Pointer(&data))
d.pushHead(unsafe.Pointer(&data))
}
}(i)
}
}()
time.Sleep(time.Second * 10)
time.Sleep(time.Second * 100000)
}
func TestFIFO(t *testing.T) {
go func() {
log.Println(http.ListenAndServe("0.0.0.0:8889", nil))
}()
logs.EnableFuncCallDepth(true)
logs.SetLogFuncCallDepth(3)
time.Sleep(time.Second * 5)
d := new(FIFOQueue)
d.New()
go func() {
time.Sleep(time.Second)
for i := 0; i < 30000; i++ {
data, err := d.Pop()
if err == nil {
//fmt.Println(i, string(data.buf), err)
logs.Warn(i, string(data.buf), err)
} else {
//fmt.Println("err", err)
logs.Warn("err", err)
}
}
}()
go func() {
time.Sleep(time.Second * 10)
for i := 0; i < 3000; i++ {
go func(i int) {
for n := 0; n < 10; n++ {
data := new(ListElement)
by := []byte("test " + strconv.Itoa(i) + strconv.Itoa(n))
_ = data.New(by, uint16(len(by)), true)
//fmt.Println(string((*data).buf), data)
logs.Warn(string((*data).buf), data)
d.Push(data)
}
}(i)
}
}()
time.Sleep(time.Second * 100000)
}
func TestPriority(t *testing.T) {
go func() {
log.Println(http.ListenAndServe("0.0.0.0:8889", nil))
}()
logs.EnableFuncCallDepth(true)
logs.SetLogFuncCallDepth(3)
time.Sleep(time.Second * 5)
d := new(PriorityQueue)
d.New()
go func() {
time.Sleep(time.Second)
for i := 0; i < 36000; i++ {
data := d.Pop()
//fmt.Println(i, string(data.buf), err)
logs.Warn(i, string(data.Content), data)
}
}()
go func() {
time.Sleep(time.Second * 10)
for i := 0; i < 3000; i++ {
go func(i int) {
for n := 0; n < 10; n++ {
data := new(common.MuxPackager)
by := []byte("test " + strconv.Itoa(i) + strconv.Itoa(n))
_ = data.NewPac(common.MUX_NEW_MSG_PART, int32(i), by)
//fmt.Println(string((*data).buf), data)
logs.Warn(string((*data).Content), data)
d.Push(data)
}
}(i)
go func(i int) {
data := new(common.MuxPackager)
_ = data.NewPac(common.MUX_NEW_CONN, int32(i), nil)
//fmt.Println(string((*data).buf), data)
logs.Warn(data)
d.Push(data)
}(i)
go func(i int) {
data := new(common.MuxPackager)
_ = data.NewPac(common.MUX_NEW_CONN_OK, int32(i), nil)
//fmt.Println(string((*data).buf), data)
logs.Warn(data)
d.Push(data)
}(i)
}
}()
time.Sleep(time.Second * 100000)
}
//func TestReceive(t *testing.T) {
// go func() {
// log.Println(http.ListenAndServe("0.0.0.0:8889", nil))
// }()
// logs.EnableFuncCallDepth(true)
// logs.SetLogFuncCallDepth(3)
// time.Sleep(time.Second * 5)
// mux := new(Mux)
// mux.bw.readBandwidth = float64(1*1024*1024)
// mux.latency = float64(1/1000)
// wind := new(ReceiveWindow)
// wind.New(mux)
// wind.
// go func() {
// time.Sleep(time.Second)
// for i := 0; i < 36000; i++ {
// data := d.Pop()
// //fmt.Println(i, string(data.buf), err)
// logs.Warn(i, string(data.Content), data)
// }
// }()
// go func() {
// time.Sleep(time.Second*10)
// for i := 0; i < 3000; i++ {
// go func(i int) {
// for n := 0; n < 10; n++{
// data := new(common.MuxPackager)
// by := []byte("test " + strconv.Itoa(i) + strconv.Itoa(n))
// _ = data.NewPac(common.MUX_NEW_MSG_PART, int32(i), by)
// //fmt.Println(string((*data).buf), data)
// logs.Warn(string((*data).Content), data)
// d.Push(data)
// }
// }(i)
// go func(i int) {
// data := new(common.MuxPackager)
// _ = data.NewPac(common.MUX_NEW_CONN, int32(i), nil)
// //fmt.Println(string((*data).buf), data)
// logs.Warn(data)
// d.Push(data)
// }(i)
// go func(i int) {
// data := new(common.MuxPackager)
// _ = data.NewPac(common.MUX_NEW_CONN_OK, int32(i), nil)
// //fmt.Println(string((*data).buf), data)
// logs.Warn(data)
// d.Push(data)
// }(i)
// }
// }()
// time.Sleep(time.Second * 100000)
//}

32
lib/mux/queue.go
View File

@ -73,6 +73,8 @@ func (Self *PriorityQueue) Push(packager *common.MuxPackager) {
return
}
const maxHunger uint8 = 10
func (Self *PriorityQueue) Pop() (packager *common.MuxPackager) {
startPop:
ptr, ok := Self.highestChain.popTail()
@ -80,7 +82,7 @@ startPop:
packager = (*common.MuxPackager)(ptr)
return
}
if Self.hunger < 100 {
if Self.hunger < maxHunger {
ptr, ok = Self.middleChain.popTail()
if ok {
packager = (*common.MuxPackager)(ptr)
@ -96,6 +98,13 @@ startPop:
}
return
}
if Self.hunger > 0 {
ptr, ok = Self.middleChain.popTail()
if ok {
packager = (*common.MuxPackager)(ptr)
return
}
}
// PriorityQueue is empty, notice Push method
if atomic.CompareAndSwapInt32(&Self.popWait, 0, 1) {
select {
@ -141,7 +150,7 @@ func (Self *FIFOQueue) New() {
func (Self *FIFOQueue) Push(element *ListElement) {
Self.chain.pushHead(unsafe.Pointer(element))
Self.length += uint32(element.l)
atomic.AddUint32(&Self.length, uint32(element.l))
Self.allowPop()
return
}
@ -151,7 +160,7 @@ startPop:
ptr, ok := Self.chain.popTail()
if ok {
element = (*ListElement)(ptr)
Self.length -= uint32(element.l)
atomic.AddUint32(&Self.length, ^uint32(element.l-1))
return
}
if atomic.CompareAndSwapInt32(&Self.popWait, 0, 1) {
@ -178,7 +187,7 @@ startPop:
}
func (Self *FIFOQueue) Len() (n uint32) {
return Self.length
return atomic.LoadUint32(&Self.length)
}
func (Self *FIFOQueue) Stop() {
@ -273,17 +282,16 @@ func (d *bufDequeue) popTail() (unsafe.Pointer, bool) {
return nil, false
}
slot := &d.vals[tail&uint32(len(d.vals)-1)]
var val unsafe.Pointer
for {
typ := atomic.LoadPointer(slot)
if typ != nil {
val = atomic.LoadPointer(slot)
if val != nil {
// We now own slot.
break
}
// Another goroutine is still pushing data on the tail.
}
// We now own slot.
val := *slot
// Tell pushHead that we're done with this slot. Zeroing the
// slot is also important so we don't leave behind references
// that could keep this object live longer than necessary.
@ -369,10 +377,10 @@ func (c *bufChain) pushHead(val unsafe.Pointer) {
d2 := &bufChainElt{prev: d}
d2.vals = make([]unsafe.Pointer, newSize)
storePoolChainElt(&c.head, d2)
storePoolChainElt(&d.next, d2)
d2.pushHead(val)
atomic.SwapInt32(&c.chainStatus, 0)
storePoolChainElt(&d.next, d2)
storePoolChainElt(&c.head, d2)
atomic.StoreInt32(&c.chainStatus, 0)
}
}
}