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Can two kernel-level threads in the same user-level process synchronize using a kernel-level semaphore? What if the threads are implemented entirely at user-level? Assume that

Can two kernel-level threads in the same user-level process synchronize using a kernel-level semaphore? What if the threads are implemented entirely at user-level? Assume that no threads in any other processes have access to the semaphore. Discuss your answers

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