#27 RTOS Part-6: Synchronization and communication among concurrent threads

This sixth lesson on RTOS talks about the RTOS mechanisms for synchronization and communication among concurrent threads. Such mechanisms are the most complex elements of any RTOS, and are generally really tricky to develop by yourself. For that reason, this lesson replaces the toy MiROS RTOS with the professional-grade QXK RTOS included in the QP/C framework, parts of which have been used since lesson 21. The lesson demonstrates the process of porting an existing application to a different RTOS, and once this is done, explains semaphores and shows how they work in practice. Articles mentioned in the lesson + recommended reading: ------------------------------------------------------- Edsger W. Dijkstra "Cooperating sequential processes", Lecture Notes EWD123, 1963 https://www.cs.utexas.edu/~EWD/transcriptions/EWD01xx/EWD123.html Jack Ganssle "A Guide to Debouncing, or, How to Debounce a Contact in Two Easy Pages" http://www.ganssle.com/debouncing.htm ------ Resources: Companion web page for this video course: https://www.state-machine.com/quickstart GitHub repository for projects for this video course: https://github.com/QuantumLeaps/modern-embedded-programming-course Preemptive Dual-Mode QXK Kernel: https://www.state-machine.com/qpc/arm-cm_qxk.html Transcript of this lesson: https://www.state-machine.com/course/lesson27.txt Music credits: The background music comes from: https://www.bensound.com/royalty-free-music/track/straight