Linux

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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Punctuality Matters: Using Linux to Manage Time-Critical Situations (www.kdab.com)

submitted 8 months ago by [email protected] to c/[email protected]

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The robustness of Linux is widely acknowledged, but it can’t quite match the microsecond management of a real-time operating system (RTOS) for time critical situations such as CNC machine instructions, vehicular control, or health sensor collection. If your software must record, manage, or control events within a narrow and precise time window and you’re invested in Linux for core development, you can consider some of these strategies for handling time-critical tasks without abandoning your familiar environment.

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[–] [email protected] 4 points 8 months ago

Back in the early aughts, QNX was making their flagship QNX 6 RTOS available for free for x86 developers. They were already quite successful with QNX 4 in medical and other mission critical equipment, and QNX 6 came with some very interesting innovations.

It ran a microkernel that did almost nothing but scheduling and message passing. Drivers were all in user space. Their Photon X server had a micro kernel architecture as well, so you could shutdown parts of it (or device drivers, for that matter) and bring them back up through the command line. You could of course set up watchdogs and automate restarts of anything but the microkernel itself.

I had some fun with it with and old and failing 486.