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Cisy 304:Computer Operating Systemii Question Paper

Cisy 304:Computer Operating Systemii

Course:Computer Science

Institution: Kenya Methodist University question papers

Exam Year:2013

KENYA METHODIST UNIVERSITY

END OF 3''RD ''TRIMESTER 2013 (FT) EXAMINATION
FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE AND BUSINESS INFORMATION
UNIT CODE : CISY 304/BBIT 419
UNIT TITLE : COMPUTER OPERATING SYSTEM II
TIME : 2 HOURS

INSTRUSTIONS: Answer question one and any other two questions

Question One

Differentiate between the following terms

Programmed i/o and interrupt driven i/o.

(2mks)

Status and control register

(2mks)

System call and API.

(2mks)

With an aid of a diagram, describe the layered operating system structure. (5mks)
Briefly describe the following memory placement algorithms.

Best fit

(2mks)

First fit

(2mks)

Next fit

(2mks)

Give the function of each of the following file management system caus.
Fd=open (file, how,…)
S= closed (fd)
N= read (fd, buffer, nbytes)
N = write (fd, buffer, nbytes)

S = stat (name, $ buf)

(5mks)

Explain the following terms as used in interprocess communication

Semaphore

(2mks)

Monitor

(2mks)

Message passing

(2mks)

Differentiate between a process and a thread.

(2mks)

Question Two

Describe how client processes communication with server process using socket IPC mechanism.

(6mks)

Differentiate between device controller and device interface.

(2mks)

With an aid of a diagram, explain the operation of direct memory access. (DMA)

(7mks)

Question Three

Explain the following memory management schemes

Dynamic partitioning.

(3mks)

Segmentation.

(3mks)

With an aid of a diagram, describe remote procedure call mechanism.

(9mks)

Question Four

Compare the following terms as used in file systems.
Direct and sequential access

Linked and contiguous allocation.

(4mks)

Explain any five parameters passed to a read files( ) function in the win 32 API.

(10mks)

Give one method used to pass parameters in the operating systems. (1mk)

Cisy 304:Computer Operating Systemii Question Paper

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