// Code Gear Name
enum Code {
    PutQueue,
    GetQueue,
};

// Unique Data Gear
enum UniqueData {
    Queue,
    Element,
};

// Queue definication
union Data {
    // size: 20 byte
    struct Queue {
        struct Element* first;
        struct Element* last;
        int count;
    } queue;
    // size: 16 byte
    struct Element {
        struct Task* task;
        struct Element* next;
    } element;
}