What are locks? If you have non pre-emptive uni processor system, is there any need of lock. (He himself was confused about what he was asking & my questions made him more confused, So in end he said lets leave this question.. :P)

What are locks? If you have non pre-emptive uni processor system, is t

1.	What are locks? If you have non pre-emptive uni processor system, is there any need of lock. (He himself was confused about what he was asking & my questions made him more confused, So in end he said lets leave this question.. :P)
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