bugfix, in startjob, we cannot modify sessionmanager's data, as it has race condition.

sessionManager.go

 }
 
 type workDone struct {
-	openID   string //which user
-	consumed int    //job done
+	openID   string            //which user
+	consumed int               //job done
+	data     openIDSessionData //modified, updated sessiondata
 }
 
 //SessionManager manage all sessions
 func (m *SessionManager) clearJobDone(d workDone) {
 	s, found := m.sessions[d.openID]
 	log.Println("SessionMgr/clearJobDone: start clearning jobs ... ")
-	log.Println(s)
-	log.Println(d)
 	if found {
 		s.count -= d.consumed
+		s.data = d.data          //updated session data
 		m.sessions[d.openID] = s //update
 		if s.count == 0 {        //no job to do
 			//remove from memory
 //worker thread, cannot change session info
 func (m *SessionManager) startJob(openID string) {
 	log.Println("SessionMgr/startJob: enter...")
-	jobFinished := workDone{openID, 0}
+	s := m.sessions[openID]
+	jobFinished := workDone{openID, 0, openIDSessionData{}}
 	//process all jobs in the channel
 	hasJob := true
 	for hasJob {
 		select {
 		case v := <-m.sessions[openID].jobs:
 			m.checkOpenID(openID, v)
-			s := m.sessions[openID]
 			s.data.incomingMsg(v) //<=== main logic for processing each incoming message
-			log.Printf("after incoming message %s", s.data.Procedure)
-			m.sessions[openID] = s
+			log.Printf("procedure after incoming message %s", s.data.Procedure)
 			jobFinished.consumed++
 		default:
 			hasJob = false
 		}
 	}
-	m.done <- jobFinished //notify parent that we have done
+	jobFinished.data = s.data //update session data
+	m.done <- jobFinished     //notify parent that we have done
 	return
 }