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Spinlocks and Semaphores

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I have few queries, I think you can help me with them. Please do try.


1. The Linux kernel enforces the following policy: a process is not allowed to try to acquire a semaphore while it is already holding a spin lock. Why is it so and what will happen if we break this rule?
2. What are the problems that occurs when using spinlocks on a single processor system(preemptible kernel and a non-preemptible kernel) 
3. What concurrency issues can arise when the up() (increment counter) and down() (decrement counter) functions of a semaphore are not executed atomically. How is it important?

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Spinlocks and Semaphores sarthak.kelapure@gmail.com - 2019-01-08 09:36 -0800

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