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In priority scheduling, if two processes have the same priority, some operating systems may use a secondary criteria, such as time since last execution or process ID, to determine the order in which they are executed. Alternatively, the operating system may use a first-come-first-serve basis for scheduling processes with the same priority.

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How does RTOS determine the Time frame If suppose you are having an event with Highest priority and if its goes on to the Infinity loop how it handles this situation being deterministic in behavior?

There are different scheduling mechanisms that RTOSes can use to be deterministic. The most common is preemptive scheduling. In this model, each task has a relative priority. The highest priority task that is ready to run gets control of the processor. This is what provides deterministic behavior. When no task is ready to run the system will go to the idle loop. An RTOS is simply a tool to acheive a deterministic system. It is up to the developer to build a system that is capable of meeting its deadlines. A poorly designed system can encounter situations where important tasks do not get processor time because a higher priority task has not released.


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