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process states

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HI
Besides the states i.e Running, Blocked,Ready.
There is something called 'Yield'. This is not a state but an action which moves ataskfrom 'running' state to 'ready' automatically (for example in case of entering of task in queue unexpecedly)

Please give more information, what is this 'Yield' and also give examples when this happens.

2) What are 'pre-emptive' tasks ?

Thanks

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