Information Technology Reference
In-Depth Information
CHAPTER 3
DESIGN PROCESS OF REAL-TIME
OPERATING SYSTEMS (RTOS)
3.1
INTRODUCTION
This chapter discusses different processes and features that are included in real-time
operating system (RTOS) designs. It complements Chapter 2, which discusses the
traditional development processes. We also cover in this chapter the common design
techniques of the past, present, and future. Real-time operating systems differ from
general-purpose operating systems in that resources are usually limited in real-time
systems so the operating system usually only has features that are needed by the
application.
A real-time software is a major part of existing software applications in the
industry. Applications of real-time software are in automotive systems, consumer
electronics, control systems, communication systems, and so on. Real-time software
systems demand special attention between they use special design techniques that are
time sensitive.
Because of the industry movement toward multiprocessor and multicore systems,
new challenges are being introduced. The operating system must now address the
needs of two processors, scheduling tasks on multiple cores and protecting the data
of a system whose memory is being accessed from multiple sources. New issues are
being uncovered, and the need for reliable solutions is needed. This chapter will cover
many of the design issues for real-time software.
In addition to hardware evolution impacting real-time operating system designs,
another factor is the need for efficient and cheap systems. Many companies are
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