Semaphore or what should I use?

[Bastian Hammer]

Hi

I´m wondering why there are so few examples with Semaphore.
Is it obsolete?

I´ve got a Class Data.
It offers 2 Threads methods for updating, editing, .. a private
dictionary.

Now I have to make sure, that both threads are synchronal, 
1 thread edits something and the other is blocked until the first
thread is ready.

Isn´t it a good idea to do this with a semaphore?

And if I should use a Semaphore here, could anybody give me an example
how it should look like?

Everything that I test throws errors :(

Thank you :)
Bye, Bastian