A mutex class with support for priority inheritance. If a thread tries to enter a critical section which is not free, it will be put to sleep and added to a queue of sleeping threads, ordered by priority. The thread that is into the critical section inherits the highest priority among the threads that are waiting if it is higher than its original priority.
This mutex is meant to be a static or global class. Dynamically creating a mutex with new or on the stack must be done with care, to avoid deleting a locked mutex, and to avoid situations where a thread tries to lock a deleted mutex.