handling pthread_mutex_lock, pthread_mutex_unlock errors

Hi Experts,

Assuming I have the following code for creating a singleton, how can I handle if error is returned from pthread functions?  What is a good way to handle it.

Manager * Manager::getInstance()
{
    if (_instance == 0)
    {
        pthread_mutex_lock(&_instanceMutex);
        if (_instance == 0) // double checked
        {
            _instance = new Manager();
        }
        pthread_mutex_unlock(&_instanceMutex);
    }
    return _instance;
}

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If I have a setter function like below, what could be the better way to handle pthread errors.

void DataHolder::setSomething(int data)
{
    pthread_mutex_lock(&m_dataMutex);
    m_data = data;
    pthread_mutex_unlock(&m_dataMutex);
}

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