Introduction
In this chapter, we discuss techniques for creating co-operative schedulers suitable for use in single-processor environments. These provide a very flexible and predictable software platform for a wide range of embedded applications, from the simplest con- sumer gadget up to and including aircraft control systems.
The following pattern is presented in this chapter:
● CO – OPERA TIVE SCHEDULER [page 255]
A co-operative scheduler provides a simple, highly predictable environment. The scheduler is written entirely in ‘C’ and becomes part of the application: this tends to make the operation of the whole system more transparent and eases development, maintenance and porting to different environments. Memory overheads are seven bytes per task and CPU requirements (which vary with tick interval) are low.