Answered: 1.Opening the file from two different…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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1.Opening the file from two different terminals simultaneously, using your favourite editor (e.g. ‘vi’, ‘naon’ etc.), results in a warning message at either one (or both) the terminals. How do you think file locks work in achieving this sort of warnings: *

a)None of the above

b)Advisory locks can detect if a file is already open. Any subsequent attempts to open the file result in the warning message to the one that is trying to acquire and already acquired lock.

c)Most text editors mediate the process of file opening using a semaphore. The semaphore reports a warning message if more than one process attempts to open a file simultaneously.

d)Locks have no role in generating such alerts/warning messages. The messages are generated upon reading the reference count of the file before opening.

e)Mandatory locks, and not advisory locks, can detect if a file is already open. Any subsequent attempts to open the file result in the warning message to the one that is trying to acquire and already acquired lock.