A free 7-part video course series that walks through building a Real-Time Operating System (RTOS) from scratch. Starting with foreground/background loops, the series progresses through manual context switching, round-robin and preemptive priority schedulers, efficient thread blocking, and synchronization primitives. The final lessons port the toy MiROS RTOS to the professional QXK RTOS within the QP/C framework, covering semaphores, mutexes, critical sections, and priority-inversion prevention via priority-ceiling and priority-inheritance protocols.
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