Problem 1. This problem is about the semantics and use of semaphores, as described in your textbook. Read the manual page for the POSIX semaphore operations sem_init(), sem_wait(), and sem_post (). a. What should the second argument to sem_init() be if the thread is to be used to synchronize threads in the same process (as opposed to different processes)? b. The library function sem_getvalue() is supposed to return the value of the semaphore vari- able. Explain why this is not a very useful call. (Hint: see the man page.) c. Consider the seconde readers-writers problem, in which writers are prioritized over readers. Suppose there are m > 1 writers and, say, n > 0 readers. Describe a scenario where a reader experiences starvation, and the shared data is never read. Be precise!
Problem 1. This problem is about the semantics and use of semaphores, as described in your textbook. Read the manual page for the POSIX semaphore operations sem_init(), sem_wait(), and sem_post (). a. What should the second argument to sem_init() be if the thread is to be used to synchronize threads in the same process (as opposed to different processes)? b. The library function sem_getvalue() is supposed to return the value of the semaphore vari- able. Explain why this is not a very useful call. (Hint: see the man page.) c. Consider the seconde readers-writers problem, in which writers are prioritized over readers. Suppose there are m > 1 writers and, say, n > 0 readers. Describe a scenario where a reader experiences starvation, and the shared data is never read. Be precise!
Chapter11: Operating Systems
Section: Chapter Questions
Problem 14VE
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