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what can the operating system do to recover from deadlock?

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The operating system can recover from deadlock by:

Killing the deadlocked process (crude, and requires that it will be restarted)

Rolling Back (going back a few instructions until it can enter a non-deadlocked state, and retry)

Pre-emption (forcing the handing over of a resource to another process, at the expense of the one it's currently deadlocked on) 

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