Computers as Components, 2nd Edition

308 CHAPTER 6 Processes and Operating Systems

This solution allows us to execute processes at rates that are simple multiples of

each other. However, when the rates aren’t related by a simple ratio, the counting

process becomes more complex and more likely to contain bugs.

We have developed somewhat more reliable code, but this programming style is

still limited in capability and prone to bugs. To improve both the capabilities and

reliability of our systems, we need to invent the RTOS.

6.2 PREEMPTIVE REAL-TIME OPERATING SYSTEMS

A RTOS executes processes based upon timing constraints provided by the system

designer. The most reliable way to meet timing ...