mutex lock priority

Question

In multithreading (2 thread) program, I have this code:

while(-1)
{
    m.lock();

    (...)

    m.unlock();
}

m is a mutex (

Answer 1

The C++ standard doesn't make any guarantee about the order locks to a mutex a granted. Thus, it is entirely possible that the active thread keeps unlock()ing and lock()ing the std::mutex m without another thread trying to acquire the lock ever getting to it. I don't think the C++ standard provides a way to control thread priorities. I don't know what you are trying to do but possibly there is another approach which avoids the problem you encounter.