Question: Why does Solaris 2 implement multiple locking mechanisms? Under what circumstances does it use spin locks, semaphores, adaptive mutexes, conditional variables, and readers-writers locks? Why

Why does Solaris 2 implement multiple locking mechanisms? Under what circumstances does it use spin locks, semaphores, adaptive mutexes, conditional variables, and readers-writers locks? Why does it use each mechanism? What is the purpose of turnstiles?

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