21.4 Real-time operating systems
The execution platform for most application systems is an operating system that manages shared resources and provides features such as a file system and runtime process management. However, the extensive functionality in a conventional operating system takes up a great deal of space and slows down the operation of programs. Furthermore, the process management features in the system may not be designed to allow fine-grain control over the scheduling of processes.
For these reasons, standard operating systems, such as Linux and Windows, are not normally used as the execution platform for real-time systems. Very simple embedded systems may be implemented as “bare metal” systems. The systems provide their own execution ...
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