How to write MutexLocker correctly?

Question

OOP

Created a self-written MutexLocker wrapper, according to RAII.

class pthread_mutex_locker
{
public:
    pthread_mutex_locker(pthread_mutex_wrapper * mu);
    ~pthread_mutex_locker();

private:
    pthread_mutex_wrapper * mutex;
};

I applied my MutexLocker with an anonymous object.

// Тело какой-то функции.
{
 pthread_mutex_locker(&mutex);
//Какой-то код

}

There is a suspicion that the anonymous object is destroyed earlier than necessary and does not protect the code. How do I get it to be destroyed when the function exits. Should MutexLocker be a named object? Are named objects guaranteed to be destroyed on function exit, and not somewhere else?
gcc version 4.8.1 20130909

Answer 1

Your variant will not work - the mutex will be destroyed immediately after creation. Strictly speaking, in C++ there is no such thing as an "anonymous instance", there is a "temporary instance".
For a named instance, destruction is guaranteed when it goes out of scope - the compound operator {}.

Answer 2

pthread_mutex_locker locker (&mutex);
Name it something, and everything will be okay.

Answer 3

What's wrong with std::lock_guard?

Answer 4

If there is no C++11, take boost::thread.