Lecture

MicroC/OS-II: Real-Time Kernel Overview

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In course

CS-476: Embedded system design

Hardware-software co-design is a well known concept in embedded system design.It is also a concept required in designing FPGA-accelerators in data-centers.This course teaches how to transform algorithms in smart hardware-software solutions. ...

Description

This lecture covers MicroC/OS-II, a real-time kernel developed by Jean-J. Labrosse since 1992. It is well-documented, portable, robust, and reliable, with multitasking capabilities and deterministic functions. Topics include soft/hard real-time systems, foreground/background systems, task management, multitasking, kernel, scheduler, and mutual exclusion. The lecture also discusses preemptive and non-preemptive kernels, reentrant functions, task priorities, rate monotonic scheduling, priority inversion, intertask communication using semaphores, event flags, message mailboxes, and message queues. It concludes with clock ticks and their role in system timing.

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Instructor

Ties Jan Henderikus Kluter

Since January 2011: Teaching digital systems at the Swiss Federal Institute of Technology, Lausanne Switzerland Since August 2009: Teaching responsible for digital systems at the university of applied science of Bern, Bienne Switzerland 2003-2010: Ph.D. candidate at the Swiss Federal Institute of Technology, Lausanne Switzerland 2002-2003: Product development team leader in the infotainment group of Agere Systems, Nieuwegein The Netherlands. 1997-2003: Design Engineer in the design services group of Dedris Embedded Algorithms/Frontier Design BV./Adelante Technologies, Tiel The Netherlands 1996-1997: Assistant R&D at the faculty of computer controlled systems and computer techniques University of Twente, Enschede The Netherlands 1992-1996: MSc. education at the Technical University of Twente, Enschede The Netherlands 1988-1992: Bc. edudation at the Higher Technical School of Groningen, Groningen The Netherlands

Official source

Ontological neighbourhood

Computer engineering

High-performance computing: Real-time computing

Related concepts (32)

Real-time operating system

A real-time operating system (RTOS) is an operating system (OS) for real-time computing applications that processes data and events that have critically defined time constraints. An RTOS is distinct from a time-sharing operating system, such as Unix, which manages the sharing of system resources with a scheduler, data buffers, or fixed task prioritization in a multitasking or multiprogramming environment. Processing time requirements need to be fully understood and bound rather than just kept as a minimum.

Scheduling (computing)

In computing, scheduling is the action of assigning resources to perform tasks. The resources may be processors, network links or expansion cards. The tasks may be threads, processes or data flows. The scheduling activity is carried out by a process called scheduler. Schedulers are often designed so as to keep all computer resources busy (as in load balancing), allow multiple users to share system resources effectively, or to achieve a target quality-of-service.

Priority inversion

In computer science, priority inversion is a scenario in scheduling in which a high priority task is indirectly superseded by a lower priority task effectively inverting the assigned priorities of the tasks. This violates the priority model that high-priority tasks can only be prevented from running by higher-priority tasks. Inversion occurs when there is a resource contention with a low-priority task that is then preempted by a medium-priority task.

Preemption (computing)

In computing, preemption is the act of temporarily interrupting an executing task, with the intention of resuming it at a later time. This interrupt is done by an external scheduler with no assistance or cooperation from the task. This preemptive scheduler usually runs in the most privileged protection ring, meaning that interruption and then resumption are considered highly secure actions. Such changes to the currently executing task of a processor are known as context switching.

Linux kernel

The Linux kernel is a free and open-source, monolithic, modular, multitasking, Unix-like operating system kernel. It was originally written in 1991 by Linus Torvalds for his i386-based PC, and it was soon adopted as the kernel for the GNU operating system, which was written to be a free (libre) replacement for Unix. Linux is provided under the GNU General Public License version 2 only, but it contains files under other compatible licenses.

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