超星 - Chapter 5 Process synchronization

单选题

The bounded buffer problem is also known as ____________

A. Readers – Writers problem
B. Dining – Philosophers problem
C. Producer – Consumer problem
D. None of the mentioned

单选题

In the bounded buffer problem, there are the empty and full semaphores that ____________

A. count the number of empty and full buffers
B. count the number of empty and full memory spaces
C. count the number of empty and full queues
D. none of the mentioned

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单选题

In the bounded buffer problem ____________

A. there is only one buffer
B. there are n buffers ( n being greater than one but finite)
C. there are infinite buffers
D. the buffer size is bounded

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单选题

To ensure difficulties do not arise in the readers – writers problem _______ are given exclusive access to the shared object.

A. readers
B. writers
C. readers and writers
D. none of the mentioned

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单选题

A deadlock free solution to the dining philosophers problem ____________

A. necessarily eliminates the possibility of starvation
B. does not necessarily eliminate the possibility of starvation
C. eliminates any possibility of any kind of problem further
D. none of the mentioned

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单选题

All processes share a semaphore variablemutex, initialized to 1. Each process must execute wait(mutex) before entering the critical section and signal(mutex) afterward.Suppose a process executes in the following manner.In this situation :

A. a deadlock will occur
B. processes will starve to enter critical section
C. several processes maybe executing in their critical section
D. all of the mentioned

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单选题

Consider the methods used by processes P1 and P2 for accessing their critical sections whenever needed, as given below. The initial values of shared boolean variables S1 and S2 are randomly assigned.Which of the following statements describes properties achieved?

A. Mutual exclusion but not progress
B. Progress but not mutual exclusion
C. Neither mutual exclusion nor progress
D. Both mutual exclusion and progress

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单选题

A monitor is a type of ____________

A. semaphore
B. low level synchronization construct
C. high level synchronization construct
D. none of the mentioned

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单选题

The monitor construct ensures that ____________

A. only one process can be active at a time within the monitor
B. n number of processes can be active at a time within the monitor (n being greater than 1)
C. the queue has only one process in it at a time
D. all of the mentioned

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单选题

What are the operations that can be invoked on a condition variable?

A. wait & signal
B. hold & wait
C. signal & hold
D. continue & signal

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