Introduction to Real-Time Operating Systems' - (PPT)

摘要

Real-time and embedded systems operate in constrained environments in which computer memory and processing power are limited. They must provide their services within strict time deadlines to their users and to the surrounding world to which they interface. It is these memory, speed and timing constraints that dictate the use of real-time operating systems in embedded software. In the discussion that follows, we will focus on the "kernel" - that part of an operating system that provides the most basic services to application software running on a processor. Kernel services typically include: Scheduling for Application Software Tasks; Communication and Synchronization between Tasks; Dynamic Allocation of RAM Memory; Timer Services.