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I think because you are using a binary struct it will write the data as a reserved block in the pipe and you won't need mutex because the data won't overlap.
I may be wrong about that.

The idea of using a pipe is pretty cool. I never taught about that. Next time I do something I'll take that into consideration. It's going to be way faster But isn't it going to be a little harsh on...

/etc/security
if you want to set it for all users you can use the wildcard * or you can put the group user and all new user are in user. so you will use @user.
Also if you are on systemd you can...

I didn't get your point about the bottleneck.
In the world of threads there is something called mutex.
paulbridger.com/mutexes
You can also check timer_create() .

Maybe you can start only one...

First of all I'd like to state that I'm a not an expert in C.
I use in C++ the boost::timer library which is an excellent one to do those calculations.

If you don't want to add dependencies to...

Instead of doing that. Why not make a common folder in /home which every users has access to.
Also, if you want, when creating the user don't create his default dir.

Try with `xmodmap -e`
Here an example of my .xinitrc:
xmodmap -e "remove Lock = Caps_Lock" # Remove Caps Lock
xmodmap -e "keycode 66 = BackSpace" # Make the key into Backspace

the key codes are...