One of the most desired characteristics of embedded operating systems, especially in life-critical and high-reliability systems, is the presence of a hard real-time scheduler. As mentioned in Chapter 10, Parallel Tasks and Scheduling, a real-time scheduler provides deterministic and short reaction times for real-time tasks, given that the load of the system does not exceed the resources available. For this reason, system developers often have based their design on real-time schedulers with static priorities.
A solid and well-designed scheduler implementation is the most fundamental part of preemptive real-time systems, and it is the base for building all the other features.
Embedded operating systems designed ...
