Operating System [3i Infotech Placement]: Sample Questions 71 - 73 of 81

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Question 71

Operating System
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Write in Short

Short Answer▾

Name two paging states for a page in memory?

Explanation

Define Paging State

The two paging states are:

  • The page is not yet eligible for swapping.
  • The page is eligible for swapping but not yet eligible for reassignment to other virtual address space.

Question 72

Operating System
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Describe in Detail

Essay▾

In UNIX a files i-node ________?

Explanation

Understanding of Process File Desc and Inode Table
  • Inode is a data structure that defines all specifications of a file like the file size, number of lines to a file, permissions etc.
  • It is used in a Unix-style file system to describe a file system object such as a file or a directory.
  • Inode stores the attributes and disk block location of the object՚s data.
  • File system object attributes may include metadata as well as owner and permission data.
  • Directories are lists of names assigned to inodes.
  • A directory contains an entry for itself, its parent, and each of its children.

Question 73

Operating System
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Write in Short

Short Answer▾

How the kernel handles the fork () system call in traditional Unix and in the system V Unix, while swapping?

Explanation

On Fork:

  • Kernel in traditional unix will make the duplicate copy of the parents address space and attaches it to the child process, while swapping.
  • Kernel in system V Unix, manipulates the region table, page table, and pfdata table entries by incrementing the reference count of the region table of shared regions.

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