how atomicity can be provided in the following cases?

[treeboi]

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

[oz]

Welcome to the forums, treeboi!

Sorry, but it's against the forum rules to post homework questions:

http://www.linuxforums.org/forum/lin...ums-rules.html