Operating System BSCS 5 Semester/Term UOS — University of Sargodha 2016
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Paper text
University of Sargodha
BSCS 5th Mid Term Examination 2016
Subject: Computer Science Paper: Operating System (CMP-3621)
Time Allowed: 1 Hour Maximum Marks: 30
1. Define context switch.
2. What is the key difference between a trap and interrupt?
3. Kernal
4. Virtual machine
5. Time Sharing Systems
6. Define DMA
Q.2 Define thread. What is different between process and thread? How threads improve the IPC? What
are user level threads and kernal level thread explain with threading models? Exaplain working of
thread using a code example of pthreads. [2+3+4+4+5]