message: added server->task_enable_coroutine
diff: @@ -460,6 +460,10 @@ struct _swServer
  * asynchronous task worker
  */
  uint32_t task_async :1;
  + /**
  + * enable coroutine in task worker
  + */
  + uint32_t task_enable_coroutine :1;
  /**
  * slowlog
  */
  