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how atomicity can be provided in the following cases?


Alkamist
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Well guys i need the help of a genius!! I have a question that i have to answer now i'm not looking necessarily for the answer but help, iv looked for weeks for the answer but i am just STUCK so here it is:

The semSignal() and semWait() operations, provided as primitives by an OS kernel, are defined to be atomic. Explain how this atomicity can be provided in the following cases:

a) hardware which provides test and set lock or other composite instruction

b) a uniprocessor when no composite instruction is available

c) a multiprocessor when no composite instruction is available

thanx for any replies i appreciate it

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