Operating System — Test 13

Correct Answer: D. D. Receive & send message
Explanation: Two operations provided by the IPC facility are receive and send messages. Exchange of data takes place in cooperating processes.

Correct Answer: C. C. Can be fixed or variable sized
Explanation: Messages sent by a process can be fixed or variable size. If the message size of the process is fixed then system level implementation is straightforward but it makes the task of programming more difficult. If the message size of the process is variable then system level implementation is more complex but it makes the task of programming simpler.

Correct Answer: A. A. Communication link
Explanation: The link between two processes P and Q to send and receive messages is called communication link. Two processes P and Q want to communicate with each other; there should be a communication link that must exist between these two processes so that both processes can able to send and receive messages using that link.

Correct Answer: B. B. A communication link is associated with exactly two processes
Explanation: For direct communication, a communication link is associated with exactly two processes. One communication link must exist between a pair of processes.

Correct Answer: C. C. There is a mailbox to help communication between p and q
Explanation: In indirect communication between processes P and Q there is a mailbox to help communication between P and Q. A mailbox can be viewed abstractly as an object into which messages can be placed by processes and from which messages can be removed.

Correct Answer: B. B. The sending process sends the message and resumes operation
Explanation: In the non blocking send, the sending process sends the message and resumes operation. Sending process doesn’t care about reception. It is also known as asynchronous send.

Correct Answer: B. B. The sender blocks until the receiver receives the message
Explanation: In the Zero capacity queue the sender blocks until the receiver receives the message. Zero capacity queue has maximum capacity of Zero; thus message queue does not have any waiting message in it.

Correct Answer: B. B. Is referred to as a message system with no buffering
Explanation: The Zero capacity queue is referred to as a message system with no buffering. Zero capacity queue has maximum capacity of Zero; thus message queue does not have any waiting message in it.

Correct Answer: B. B. Automatic buffering
Explanation: Bounded capacity and Unbounded capacity queues are referred to as Automatic buffering. Buffer capacity of the Bounded capacity queue is finite length and buffer capacity of the Unbounded queue is infinite.

Correct Answer: A. A. Key