class AppCmd
{
  virtual void execute() = 0;
}

class MyCmd : public Appcmd
{
   MyCmd(MyObject & obj, params) :
    mObj(obj),
    mParams(params)
   {}

   void execute()
   {
     mObj.xxx(mParams);
   }
  
   MyObject & mObj;
   Params mPararms;
}

ConcurrentQueue<AppCmd> fifo;


线程 A： fifo.enqueue(cmd);
线程 B: 
void loop(0
{
  while(!mShutdown)
  {
     AppCmd cmd;
    fifo.dequeue_wait_timed(cmd);
    cmd.execute();
  }
}