static Mutex s_dinosaurMutex;
static vector<Dinosaur> s_dinosaurList;

void AddDinosaur(const Dinosaur& dinosaur)
{
    s_dinosaurMutex.Lock();
    s_dinosaurList.push_back(dinosaur);
    s_dinosaurMutex.Unlock();
}

void RemoveDinosaur(const Dinosaur& dinosaur)
{
    s_dinosaurMutex.Lock();

    vector<IMadderReceiver*>::iterator it = find(s_dinosaurList.begin(), s_dinosaurList.end(), dinosaur);
    if (it != s_dinosaurList.end())
        s_dinosaurList.erase(it);

    s_dinosaurMutex.Unlock();
}

void FeedDinosaur(const Dinosaur& dinosaur)
{
    s_dinosaurMutex.Lock();

    vector<IMadderReceiver*>::iterator it = find(s_dinosaurList.begin(), s_dinosaurList.end(), dinosaur);
    if (it != s_dinosaurList.end())
        (*it).Feed(); // Feeding a dinosaur can take a long time, ~ 1 second

    s_dinosaurMutex.Unlock();
}