[Qt-interest] Documentation on Mutex, Semaphore and Critical Section with Qt?

[Matthias Pospiech]

I am looking for general introduction and documentation of Mutex, 
Semaphore, Critical Section and such.
(btw I could not see any difference between mutexes and critical 
sections from what I found on the web).
Best would be if it would also describe the Qt-way of doing things if Qt 
offers something in that case.

I would also be necessary for me to see examples where these concepts 
are used in a whole class and not only
a single function, and when it applies across different classes.

Right now I am working with manual locking mechanism across different 
classes and threads, where QMutex
is not helping at all and I believe all of this could be done better and 
safer.

Matthias