RTOS
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RTLinux is a hard realtime RTOS microkernel that runs the entire Linux operating system as a fully preemptive process. It is one hard realtime variant of Linux, among several, that makes it possible to control robots, data acquisition systems, manufacturing plants, and other time-sensitive instruments and machines. It was developed by Victor Yodaiken, Michael Barabanov, Cort Dougan and others at the New Mexico Institute of Mining and Technology and then as a commercial product at FSMLabs.
RTLinux
Wind River : RTLinuxFree
Before I think of using this, i should read the licence agreement completely .... by Feb 3
A real-time operating system ( RTOS ) is an operating system (OS) intended to serve real-time application requests. It must be able to process data as it comes in, typically without buffering delays. Processing time requirements (including any OS delay) are measured in tenths of seconds or shorter. A key characteristic of an RTOS is the level of its consistency concerning the amount of time it takes to accept and complete an application's task ; the variability is jitter . [ 1 ] A hard real-time operating system has less jitter than a soft real-time operating system. The chief design goal is not high throughput , but rather a guarantee of a soft or hard performance category.
Real-time operating system
RTAI stands for R eal- T ime A pplication I nterface. It is a real-time extension for the Linux kernel - which lets you write applications with strict timing constraints for Linux. Like Linux itself the RTAI software is a community effort.