当设置 dispatch_mode = 2 时，onConnect, onClose 事件与 onReceive 事件不在一个工作进程中。详见截图！ about swoole-src HOT 4 CLOSED

//使用fd取摸来散列
        else if (serv->dispatch_mode == SW_DISPATCH_FDMOD)
        {
            if(data->info.type == SW_EVENT_TCP)
            {
                pti = data->info.fd % object->worker_num;
            }
            //udp use remote port
            else
            {
                pti = ((uint16_t) data->info.from_id) % object->worker_num;
            }
        }

//使用fd取摸来散列
        else if (serv->dispatch_mode == SW_DISPATCH_FDMOD)
        {
            //udp use remote port
            if (data->info.type == SW_EVENT_UDP)
            {
                pti = ((uint16_t) data->info.from_id) % object->worker_num;
            }
            else
            {
                pti = data->info.fd % object->worker_num;
            }
        }