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 CS604 2010

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PostSubject: CS604 2010   Tue Jun 01, 2010 4:50 pm

MIDTERM EXAMINATION
Spring 2010
CS604- Operating Systems (Session - 3)

Time: 60 min
Marks: 40


Question No: 1 ( Marks: 1 ) - Please choose one
The hardware mechanism that enables a device to notify CPU is called an -------------

► Interrupt

► Signal
► Trap



► Process

Question No: 2 ( Marks: 1 ) - Please choose one
You can display the contents (names of files and directories) of a directory in UNIX/Linux directory structure with the --------------- command.


► l
l

► s

► ls



► none of the given options

Question No: 3 ( Marks: 1 ) - Please choose one
The -------------- system call suspends the calling process.

► fork

► wait

► exec



► exit

Question No: 4 ( Marks: 1 ) - Please choose one
In ---------addressing, the recipient is not required to name the sender.

► Symmetric




► Asymmetric
► Both symmetric and asymmetric
► None of the given options

Question No: 5 ( Marks: 1 ) - Please choose one
-------- command gives a snapshot of the current processes.

► ps


► top
► who
► ls

Question No: 6 ( Marks: 1 ) - Please choose one
--------------command to resume the execution of a suspended job in the foreground

► fg




► bg
► jobs
► kill

Question No: 7 ( Marks: 1 ) - Please choose one
You can use the ------------- command to display the status of suspended and background processes

► fg




► bg
► jobs
► kill

Question No: 8 ( Marks: 1 ) - Please choose one
You can terminate a foreground process by pressing --------------









► None of the given options

Question No: 9 ( Marks: 1 ) - Please choose one
A time sharing system is

► Multi tasking

► Interactive

► All of these

► Multi user




Question No: 10 ( Marks: 1 ) - Please choose one
The main characteristic of a Real time system is

► Efficiency

► Large Virtual Memory

► Large secondary storage device

► Usability


Question No: 11 ( Marks: 1 ) - Please choose one
Shared libraries and kernel modules are stored in _____________ directory

► /bin

► /dev

► /boot

► /lib


Question No: 12 ( Marks: 1 ) - Please choose one
__________ scheduler selects the process from the job pool and put them in main memory.

► Long term

► Short term

► Medium term

► Swapper


Question No: 13 ( Marks: 1 ) - Please choose one
In indirect inter process communication, a sender ___ mention the name of the recipient.

► do

► do not


Question No: 14 ( Marks: 1 ) - Please choose one
A ______________ is an integer variable that, apart from initialization is accessible only through two standard atomic operations: wait and signal.

► Semaphore

► Monitor

► Critical region

► Critical section


Question No: 15 ( Marks: 1 ) - Please choose one
A semaphore that cause Busy-Waiting is termed as ___________.

► Spinlock

► Monitor

► Critical region

► Critical section


Question No: 16 ( Marks: 1 ) - Please choose one
The execution of critical sections must NOT be mutually exclusive

► True
► False

Question No: 17 ( Marks: 1 ) - Please choose one
The performance of Round Robin algorithm does NOT depends heavily on the size of the time quantum.

► True
► False

Question No: 18 ( Marks: 1 ) - Please choose one
The following requirement for solving critical section problem is known as ______________.
“There exists a bound on the number of times that other processes are allowed to enter their critical sections after a process has made a request to enter its critical section and before that request is granted.”

► Progress

► Bounded Waiting

► Mutual Exclusion


► Critical Region

Question No: 19 ( Marks: 1 ) - Please choose one
The critical section problem can be solved by the following except

► Software based solution

► Firmware based solution

► Operating system based solution

► Hardware based solution


Question No: 20 ( Marks: 1 ) - Please choose one
___________ is also called Swapper.

► Swap space

► Medium term scheduler

► Short term scheduler

► Long term scheduler


Question No: 21 ( Marks: 2 )
Write the formula/ procedure for calculating the waiting time in preemptive Shortest Job First scheduling.


Question No: 22 ( Marks: 2 )
What are the common data structures in Bakery Algorithm?

Question No: 23 ( Marks: 3 )
If a process exits and there are still threads of that process running, will they continue to run?


Question No: 24 ( Marks: 3 )
What are the important characteristics of TestAndSet? What will be its advantage.

Question No: 25 ( Marks: 5 )
Considering the Resource sharing feature of thread, what do you think is ‘resource sharing’ an advantage of a thread or disadvantage of a thread. Explain yours answer briefly.



Question No: 26 ( Marks: 5 )
Analyze the given algorithm proposed to solve the critical section problem. Identify the shortcomings of this algorithm.
do{
while(turn!=j);
critical section
turn=j;
remainder section
} while(1)
***********************************************************************
#1: In priority scheduling
Process Burst time priority
P1 10 3
P2 1 1
P3 2 5
P4 5 1
P5 14 3


Q#2:What advantage can take from preemptive that cannot be taken by non-preemptive.
Q#3:What is busy waiting?

Q#4: Differentiate process an thread

20 MCQS.
***********************************************


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