Hi! It think first you have to define what real-time is. There are so many definitions around, but the one I prefer is the one given in the book "Real-Time Systems - Design Principles for Distributed Applications" by Hermann Kopetz: "A real-time computer system is a computer system in which the correctness of the system behavior depends not only on the logical results of the computations, but also on the physical time, when these results are produced. The point in time when a result has to be produced is called a deadline. Deadlines are dictated by the environment of the real-time computer system." Furthermore he defines: "If the result has utility even after the deadline, we call the deadline soft. Systems with soft deadlines are not the focus of these lectures. If the result has no utility after the deadline has passed, the deadline is called firm. If a catastrophe could result if a strict deadline is missed, the deadline is called hard. A real-time computer system that has to meet at least one hard deadline is called a hard real-time system. Hard- and soft real-time system design are fundamentally different." You wanted a good online explanation, and I cited you the book, but you can find the definition on slides from Hermann Kopetz here: http://ti.tuwien.ac.at/rts/teaching/courses/ezs/Pdf_Slides_WS07/1_Introduction.pdf He also suggests some other ways to classify real-time systems. I know my answer does not tell you anything about real-time linux. I don't know what you mean with WRT linux? is this some real-time linux project? i only know openwrt, but thats nothing about real-time. Some good links for Real-Time linux are listed below: http://www.osadl.org/Realtime-Linux.projects-realtime-linux.0.html - The Open Source Automation Development lab here you can also find some further links http://dslab.lzu.edu.cn/docs/summer_school_2005/docs/study.pdf - A comparative study of different real-time linux projects (e.g. RTlinux/GPL, RTAI, ADEOS) http://www.realtimelinuxfoundation.org/ - The realtimelinuxfoundation organizes a real-time linux every year, you can download the papers of the previous 9 workshops on the homepage. regards Andi Robert P. J. Day wrote: > is there a good online explanation of the difference WRT linux? > thanks. > > rday > -- > > ======================================================================== > Robert P. J. Day > Linux Consulting, Training and Annoying Kernel Pedantry: > Have classroom, will lecture. > > http://crashcourse.ca Waterloo, Ontario, CANADA > ======================================================================== > > -- > To unsubscribe from this list: send an email with > "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx > Please read the FAQ at http://kernelnewbies.org/FAQ > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
