change SessionPool's List as List ref

session_pool.go

@@ -36,8 +36,8 @@ import (
 //
 // Notice that all queries will be executed in the default space specified in the pool config.
 type SessionPool struct {
- idleSessions list.List
- activeSessions list.List
+ idleSessions *list.List
+ activeSessions *list.List
  conf SessionPoolConf
  tz timezoneInfo
  log Logger
@@ -654,7 +654,7 @@ func parseParams(params map[string]interface{}) (map[string]*nebula.Value, error
 func (pool *SessionPool) removeSessionFromActive(session *pureSession) {
  pool.rwLock.Lock()
  defer pool.rwLock.Unlock()
- l := &pool.activeSessions
+ l := pool.activeSessions
  for ele := l.Front(); ele != nil; ele = ele.Next() {
  if ele.Value.(*pureSession) == session {
  l.Remove(ele)
@@ -665,14 +665,14 @@ func (pool *SessionPool) removeSessionFromActive(session *pureSession) {
 func (pool *SessionPool) addSessionToActive(session *pureSession) {
  pool.rwLock.Lock()
  defer pool.rwLock.Unlock()
- l := &pool.activeSessions
+ l := pool.activeSessions
  l.PushBack(session)
 }
 
 func (pool *SessionPool) removeSessionFromIdle(session *pureSession) {
  pool.rwLock.Lock()
  defer pool.rwLock.Unlock()
- l := &pool.idleSessions
+ l := pool.idleSessions
  for ele := l.Front(); ele != nil; ele = ele.Next() {
  if ele.Value.(*pureSession) == session {
  l.Remove(ele)
@@ -683,21 +683,21 @@ func (pool *SessionPool) removeSessionFromIdle(session *pureSession) {
 func (pool *SessionPool) addSessionToIdle(session *pureSession) {
  pool.rwLock.Lock()
  defer pool.rwLock.Unlock()
- l := &pool.idleSessions
+ l := pool.idleSessions
  l.PushBack(session)
 }
 
 // returnSession returns a session from active list to the idle list.
 func (pool *SessionPool) returnSession(session *pureSession) {
  pool.rwLock.Lock()
  defer pool.rwLock.Unlock()
- l := &pool.activeSessions
+ l := pool.activeSessions
  for ele := l.Front(); ele != nil; ele = ele.Next() {
  if ele.Value.(*pureSession) == session {
  l.Remove(ele)
  }
  }
- l = &pool.idleSessions
+ l = pool.idleSessions
  l.PushBack(session)
  session.returnedAt = time.Now()
 }