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Each time the priority-based preemptive scheduler is alerted by an external world trigger (such as a switch closing) or a software trigger (such as a message arrival), it must go through the following 5 steps
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Fixed-time task switching
The time it takes to do task switching is of interest when evaluating an operating system. A simple general-computing (non-preemptive) operating system might do task switching only at timer tick times, which might for example be ten milliseconds apart. Then if the need for a task switch arises anywhere within a 10-millisecond timeframe, the actual task switch would occur only at the end of the current 10-millisecond period. Such a delay would be unacceptable in most real-time embedded systems.
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RTOS Scheduling Algorithms
Polled Loop System
When task associated actions are complete, operating system continues polling for tasks
requiring operating time.
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RTOS Scheduling Algorithms
Round-robin System
Example: missile patch
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RTOS Scheduling Algorithms
Interrupt Driven System
System then placed in continuous loop to wait for interrupt driven events
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