C++ thread interfere the LCM::subscribe

[AdamPengG]

I have use the C++ thread with the LCM::subscribe in main function.The thread run well.But subscribe doesn't call the call back method.Does the subscribe can't use when I use a C++ thread.
Here is my code:
int main(int argc,char **argv){
Camera zed;
InitParameters init_params;
init_params.camera_resolution = RESOLUTION_HD1080;
init_params.depth_mode = DEPTH_MODE_PERFORMANCE;
init_params.coordinate_units = UNIT_METER;
if (argc > 1) init_params.svo_input_filename.set(argv[1]);

    ERROR_CODE err = zed.open(init_params);
        if (err != SUCCESS) {
            printf("%s\n", toString(err).c_str());
            zed.close();
            return 1; // Quit if an error occurred
        }

    //LCM
    lcm::LCM lcm;
    if (!lcm.good())
          return 1;
    Handler handlerObject;
    lcm.subscribe("InsData",&Handler::Callback_RTK,&handlerObject);//The Callback_RTK can't cout anything.

    thread t1 (savepic,ref(zed));
    thread t2 (saveIMU,ref(zed));
    thread t3 (saveRTK);//file out the Rtk data. RTK vector is a global variable.
    //thread t4 (lcm.subscribe,ref("InsData"),ref(Handler::Callback_RTK),ref(handlerObject));

    //t4.join();
    t3.join();
    t2.join();
    t1.join();
 
    while(0==lcm.handle());
    return 0;

}