CS604 Assignment No 1 Spring 2017
Here we have complete CS604 - Operating System Assignment No 01 Spring 2017 Solution and Discussion. CS604 Assignment Due Date: 01/05/2017.
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| CS604 Assignment No 1 Spring 2017 - Solution and Discussion |
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Turn off interrupts : Privileged so that a process cannot monopolize the CPU
CS604 Assignment Questions:
Totals Marks of CS604 Assignment No. 1 are 20 Marks. CS604 Assignment Due Date: 01/05/2017
CS604 Assignment Question No. 1:
Marks = 5
Being an end user and an administration of any system, there are some privileges that have been given to you, suppose you are going to take the initial test as an operating system developer then specify which of the following instructions should be “Privileged” and “Non- Privileged”?
Instructions Name Privileged Or Non-Privileged
Clear memory
Turn off interrupts
Issue trap instructions
System Call
AccessI/O Instructions
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Categorize the following examples into some events that cause the kernel code to invoke in order to manage computer resources (like I/O devices, memory and storage management) and control user programs to prevent errors and improper use of a computer system. That event could be an Interrupt, signal and trap:
1. Ahmad write a code in c language, like a=b/0.
2. Ayesha is compiling a C program an error occurs Invalid memory access or buffer overflow.
3. While running a program, you press .
4. Yasir is typing Alphabets in notepad by hitting keystroke.
5. Bilal opening a folder from desktop by double clicking mouse.
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Understand the below program carefully and explain each line accordingly.
#include
void main ( )
1………………… {
2……………………….int pid, status;
3……………………….pid = fork ( );
4……………………….if (pid = = -1)
5……………………… {
6……………………………printf(“fork failed\n”);
7……………………………exit(1) ;
8……………………….}
9………………………if (pid = = 0)
10……………………… {
11………………………... printf( “Child here ! \n”);
12………………………... exit (0);
13……………………….}
14……………………….else
15……………………… {
16………………………… wait (&status);
17………………………… printf(“well done kid !\n”);
18………………………… exit (0);
19……………………….}
20………………….}
Being an end user and an administration of any system, there are some privileges that have been given to you, suppose you are going to take the initial test as an operating system developer then specify which of the following instructions should be “Privileged” and “Non- Privileged”?
Instructions Name Privileged Or Non-Privileged
Clear memory
Turn off interrupts
Issue trap instructions
System Call
AccessI/O Instructions
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CS604 Assignment Question No. 2:
Marks = 5
1. Ahmad write a code in c language, like a=b/0.
2. Ayesha is compiling a C program an error occurs Invalid memory access or buffer overflow.
3. While running a program, you press .
4. Yasir is typing Alphabets in notepad by hitting keystroke.
5. Bilal opening a folder from desktop by double clicking mouse.
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CS604 Assignment Question No. 3:
Marks = 10
Understand the below program carefully and explain each line accordingly.
#include
void main ( )
1………………… {
2……………………….int pid, status;
3……………………….pid = fork ( );
4……………………….if (pid = = -1)
5……………………… {
6……………………………printf(“fork failed\n”);
7……………………………exit(1) ;
8……………………….}
9………………………if (pid = = 0)
10……………………… {
11………………………... printf( “Child here ! \n”);
12………………………... exit (0);
13……………………….}
14……………………….else
15……………………… {
16………………………… wait (&status);
17………………………… printf(“well done kid !\n”);
18………………………… exit (0);
19……………………….}
20………………….}
CS604 Assignment No 01 Solution:
The Solution idea of Cs604 Assignment no 1 is Suggested by Shahid Ali Bhatti . Give your remarks in Comments below:
CS604 Assignment Question no 1 Solution Idea
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| CS604 Assignment Question no 1 Solution Idea |
CS604 Assignment Question No 1 Solution:
The following operations need to be privileged: clear memory, turn off interrupts, access I/O Instructions. The rest can be performed in user mode.
Name Privileged
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Non-Privileged
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Clear memory
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Clear Memory
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Turn off interrupts
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Turn off Interrupts
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Issue trap instructions
|
issue trap instructions
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System Call
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System Call
| |
Access I/O Instructions
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Access I/O call
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Turn off interrupts : Privileged so that a process cannot monopolize the CPU
CS604 Assignment Question no 2 Solution
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| CS604 Assignment Question no 2 Solution Idea |
CS604 Assignment Question NO 3 Solution
#include <stdio.h> void main ( )
1………………… {
Starting the main
2……………………….int pid, status;
Two integers declared
3……………………….pid = fork ( );
Fork function is called, after processing returned data saved into pid
4……………………….if (pid = = -1)
If condition if pid equal to -1
5……………………… {
Entering into if condition
6……………………………printf(“fork failed\n”);
Will be printed fork failed
7……………………………exit(1) ;
Terminate program
8……………………….}
End of if
9………………………if (pid = = 0)
Starting if condition, if pid equal to 0
10……………………… {
Entering into if condition
11………………………... printf( “Child here ! \n”);
Will be print on screen child here!
12………………………... exit (0);
Terminate program
13……………………….}
End of if statement
14……………………….else
Else start
15……………………… {
Entering into else statement
16………………………… wait (&status);
Wait function is called and address status is passed as a parameter
17………………………… printf(“well done kid !\n”);
Will be printed well done kid!
18………………………… exit (0);
Terminate program
19……………………….}
End of else statement
20………………….}
End of main
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