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OS LAB(CSE29)

OS LAB(CSE29)

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Which of the following statements are true?

A. Longest job first scheduling may cause starvation

B. Non-Preemptive scheduling may cause starvation

C. FCFS is better than Round robin in terms of response time

Let us assume that a parent process with a process id of 1012 is completed before the completion of the child process with a process id of 1013. Among the following statements which is true about the child process.

A) The child process becomes a zombie process.

B) The parent process id of the child is 1012.

C) The child process becomes a orphan process.

D) The parent process id of the child is other than1012.

What is the command to identify the system demon process?

b. All of these

67%

a. PS –AUX | GREP PID

c. PS –AUX | GERP PID

d. PS -AXU | GREP PID

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On a successful call to the fork () API, what value is return to the parent process.

d. PID of the child

b. None of these above

a. 0

c. -1

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Function “WEXITSTATUS” returns the PID of

b. Child process which terminated.

d. Parent process which terminated.

c. All of above.

a. Both child and parent terminated.

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Find the correct statement.

b. If a parent not sending any data but the child is calling the receiving file descriptor then read function will be blocked.

d. A pipe can pass array of integers to accomadate three file descriptors.

a. Named pipes are used for inter process communication between two related process.

c. If a child not sending any data but the parent is calling the receiving file descriptor then write function will be blocked.

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Consider a process P1 that forks P2, P2 forks P3, and P3 forks P4. P1 and P2 continue to execute while P3 terminates. Now, when P4 terminates, which process must wait for and reap P4?

There are 20 different processes running on a workstation. Idle processes are waiting for an input event in the input queue. Busy processes are scheduled with the Round-Robin time sharing method. Which of the following quantum times is the best value for small response times, if the processes have a short runtime, i.e. less than 20ms?

Consider a set of n tasks with known runtimes R1, R2, …,Rn to be run on a uniprocessor machine. Which of the following processor scheduling algorithms will result in the maximum throughput?

a. First-Come-First-Served

c. Shortest-Job-First

75%

b. Round-Robin

d. None of these above

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The fork() API creates a new process by duplicating the calling process. In this context, which of the following is true about it.

b. The entire virtual address space of the parent is replicated in the child

c. Child inherits copies of the parent's set of open file descriptors

a. All of these above

50%

d. Child process and the parent process run in separate memory spaces

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