Why is the name "monitor"?

Question

I mean monitors as described here:

http://en.wikipedia.org/wiki/Monitor_(synchronization)

None of the definitions here look something like this:

http://www.thefreedictionary.com/monitor

So why are they called that?

== Update ==

Thanks for the answers, everyone!

I was probably confused because I don’t think that monitors usually act on themselves, which seems to be happening here. For example, you use a monitor to monitor a child. I just don’t think that it would be very important for a child to control himself, but I could be wrong.

Answer 1

P. Brinch Hansen " : " , 60 70- :

1960- . RC 4000 , " " ( , 1969).

Answer 2

, ,. , 1) , 2) , . , , .

Answer 3

, 3a ( )

3a. , .

Answer 4

, ( ) .

Monitor:

3A 4 ( , ).

1, 2, 5 ", " .