Question: Operating System, threads : - Threads can be handled in user mode or kernel mode. Describe the advantages and disadvantages of each. - Describe a

Operating System, threads :

- Threads can be handled in user mode or kernel mode. Describe the advantages and disadvantages of each.

- Describe a situation in which several threads are running and require the use of a semaphore or mutex. In other words what is a critical region and why is it necessary.

- Why is an atomic instruction like testAndSet needed to implement a mutex. What is the problem with busy waiting, and when would it be ok to use. What is the alternative to busy waiting?

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