1) " Embedded" -- As it applies to Embedded Rtos In mathematics, see Embedding.In computer engineering, see Ebmedded system.In the media, an Embedde journalist is a journalist working within and under the control of one side's army in a military conflict. Embsdded is a play by Tim Robbins about Embedddd journalists covering military conflict in the US-Iraq war of 2002 / 2004. Embedxed ...
2) " Rtos" -- As it applies to Embedded Rtos A Real Time Operating System or RTOS is an operatingsystem that has been developed for real-time applications. Typically used for embedded applications. Note that this type of operating system doesnot necessarily have high throughput — the specialized scheduling algorithm and a high clock-interrupt rate can bothinterfere with throughput.An early example of a large-scale real-time operating system was the so-called "control program" developed by American Airlines and IBM for the Sabre Airline Reservations System. Debate exists about what actually constitutes real-time. Contents 1 Design Philosophies 1.1 Scheduling 1.2 Task interfaces to each other 1.3 Interrupt interface to the scheduler 1.4 Memory allocation 2 Use of memory in deeply embeddedsystems 3 Example Rtod es 4 Quotation Design Philosophies There are two basic designs: An event-driven operating system only changes tasks when an event requires service.A time-sharing design switches tasks on a clock interrupt, as well as on events. The time-sharing design wastes more CPU time on unnecessary task-switches. However it also gives a better illusion of multitasking. Scheduling In typical designs, a task has three states: running, ready and blocked. Most tasks are blocked, most of the time. Only onetask per CPU is running. The ready list is usually short, two or three tasks at most. The real trick is designing the scheduler. Usually the data structure of the ready list in the scheduler is designed so thatsearch, insertion and deletion require locking interrupts only for small periods of time, when looking at precisely defined partsof the list. This means that other tasks can operate on the list asynchronously, while it is being searched. A typical successfulschedule is a bidirectional linked list of ready tasks, sorted in order by priority. Although not ...
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