pre-emptive multitasking

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pre-emptive multitasking
a type of multitasking where the scheduler can interrupt and suspend ("swap out") the currently running task in order to start or continue running ("swap in") another task. the tasks under pre-emptive multitasking can be written as though they were the only task and the scheduler decides when to swap them. the scheduler must ensure that when swapping tasks, sufficient state is saved and restored that tasks do not interfere.

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