In the last lesson, you encountered the concept of a Real-Time Operating System (RTOS), and you worked out a manual procedure of switching the context from one thread to another. In this lesson, ...

This fifth lesson on RTOS finally addresses the real-time aspect of the “Real-Time Operating System” name. Specifically, in the video lesson 26, you add a preemptive, priority-based scheduler to the ...

Modern CPUs can run in two modes: kernel mode and user mode. When a CPU runs in kernel mode, an extended set of instructions is allowed, as is free access to anywhere in memory and device registers.

To load a program into memory, you mustfirst load a program into memory. The bootupprocess, often a complex multistep sequenceinvolving numerous substeps, solvesthis problem. Any boot-up process, ...

As the forerunner to the graphical user interfaces in Microsoft’s Windows platform, MS-DOS helped set the stage for the company’s dominance in the PC software market. When MS-DOS was released in 1981, ...

The tech giant will begin selling its first cell phone based on Linux this year and says most models will follow suit--a sign of the growing popularity of the operating system. Stephen Shankland ...