int code = 0;
    if(load0(res0)){
        code = -1;
        goto e_res0;
    }
    some_code_here();
    if(load1(res1)){
        code = -2;
        goto e_res1;
    }
    some_other_code_here();
    if(load2(res2)){
        code = -3;
        goto e_res2;
    }
    yet_another_code_here();
    if(load3(res3)){
        code = -4;
        goto e_res3;
    }
    and_yet_another_code_here();
    unload3(res3);
e_res3:
    unload2(res2);
e_res2:
    unload1(res1);
e_res1:
    unload0(res0);
e_res0:
    return code;