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| RTOS |
A real-time operating system (RTOS) environment, the command will respond within a specified time. The actual time can be as the system response to small all instantly. A real-time operating system (RTOS) compresses two components, viz. "Real Time" and "operating system". Is the operating system (OS) but call a collection of systems or functions that offer an interface between hardware and application programs. To manage the hardware resources and run applications on your host computer.
A real-time application on an application that both precise results and the additional restrictions on the period is available. RTOS operating system is compatible with real-time applications and supply a logical consequence of the right time is essential. The basic structure is similar to the normal operating system, but also mechanisms to create enabling real-time programs. Must correspond to respond in real time, limited time, or to respond to serious consequences, including failure. Real-time systems are so hard, soft or hard classified.
Basic OS Functions:-
1. Process Management,
2. Resources Management,
3. Device Management,
4. I/O Devices subsystems
5. Network Devices and subsystems management
Some generally used RTOS scheduling algorithms are:-
1. Cooperative scheduling
2. Preemptive scheduling
(I) Rate-monotonic scheduling
(II) Round-robin scheduling
(III) Fixed priority pre-emptive scheduling, an implementation of preemptive time slicing
(IV) Fixed-Priority Scheduling with Deferred Preemption
(V) Fixed-Priority Non-preemptive Scheduling
(VI) Critical section preemptive scheduling
(VII) Static time scheduling
3. Earliest Deadline First approach
4. Stochastic digraphs with multi-threaded graph traversal
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