Hello all,
As electrfunch stated that,
"The idea behind realtime OS-es is to issue instructions based on a continuous feedback cycle"
its true, not in the context that it has to do all the time, but it is designed in order to respond to events as fast as possible and nearly all of then which occur.
Now an RTOS can be embedded into a time critial environment where feedback is critical for its operation, so it needs to respond to it, quick