MicroC/OS-II: Real-Time Kernel Overview

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.

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Related lectures (3)

Related concepts (90)

CS-476: Real-time embedded systems

A real time system is subject to important temporal constraints. This course is about understanding where processing time is spent and what a designer can do in order to achieve real-time processing s

Rate-monotonic scheduling

In computer science, rate-monotonic scheduling (RMS) is a priority assignment algorithm used in real-time operating systems (RTOS) with a static-priority scheduling class. The static priorities are assigned according to the cycle duration of the job, so a shorter cycle duration results in a higher job priority. These operating systems are generally preemptive and have deterministic guarantees with regard to response times. Rate monotonic analysis is used in conjunction with those systems to provide scheduling guarantees for a particular application.

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.

Time management

Time management is the process of planning and exercising conscious control of time spent on specific activities - especially to increase effectiveness, efficiency, and productivity. It involves of various demands upon a person relating to work, social life, family, hobbies, personal interests, and commitments with the finite nature of time. Using time effectively gives the person "choice" on spending or managing activities at their own time and expediency.

Multiprocessors, Processes and Switching

Covers the creation of processes, switching between them, handling interrupts, and the context switch mechanism in the multiprocessor world.

Concurrency and Mutual Exclusion CS-323: Introduction to operating systems

Covers the importance of concurrency, atomic operations, and mutual exclusion using locks.

Interrupts and System Calls

Explores interrupts, exception handling, and system calls in operating systems, focusing on CPU behavior and interrupt handling mechanisms.