Fix the data parsing when in multiple threads.

fujuntang

2021-09-23 82b028cf63953d8080b63d85468eae488d212194

 test_socket/heart_beat.sh

@@ -50,6 +50,16 @@
  close
  ;;

  "test2")
  start_server
   sleep 1
   start_clients
   sleep 5
   kill -15 server_pid
   sleep 2 
   close_clients
  ;;

  "")
   start_server
   sleep 1