text: // number accepting threads, 1 is ok
  #define A_TH_N 1
  // number processing threads, = numCPUs
  #define P_TH_N 2
  
  // CALLBACK CODE USE
  
  // use on_connect
  #define USE_ON_CONNECT_CB
  
  // use on_data
  #define USE_ON_DATA_CB
  
  // use on_read
  //#define USE_ON_READ_CB
  
  // use on_write
  //#define USE_ON_WRITE_CB
  
  // use on_close
  #define USE_ON_CLOSE_CB
  