OPERATING SYSTEMS QUESTIONS FOR WEEKLY TEST -4

DESCRIPTIVE QUESTIONS

1. Define Process. Explain Life Cycle of Process with state transition diagram.    
2. Explain operations on Processes?   
3. Explain Process Schedulers?                                                                      
4. Consider the following set of processes.

Process	Arrival Time	Burst Time
P1	0	10
P2	1	1
P3	3	2
P4	4	1
P5	5	5

                                                                           Calculate Average waiting time and Average Turn Around Time using FCFS, SJF (Non-Preemptive ) Scheduling.              

BITS

1.      Process creation in UNIX  is made by means of the kernel system call.    [ ]                                                                                                                                                        a)create()   b)join()            c)fork()            d)delay()

2.      The Time elapsed between , process submission to its total completion is known as ---_______.                                                  [                  ]

            a) Wait time    b)Response time          c)Turn around time     d)Throughput

3.      PCB stands for ____________________________________.

4.      __________________ is a light weight process.

            5.      The ­­­­­­­­­­­­­­­­­­­_______ is the module that gives control of the CPU to the process selected by                         The  scheduler.                                                                                          

OPERATING SYSTEMS NOTES UNIT-I,II

OS NOTES UNIT-I,II

COMPILER DESIGN LAB MANUAL

CD LAB MANUAL

ITWS,OOPS-JAVA,DS C++ LAB OBSERVATIONS

1) ITWS
https://drive.google.com/open?id=0B1cLL4GgUF32ZUdGM01tYmVNcFk

2) OOP'S - JAVA
https://drive.google.com/open?id=0B1cLL4GgUF32OU5ZMlZ1SkxUdjA

3) DS C++
https://drive.google.com/open?id=0B1cLL4GgUF32V1U1bG9VOUY0X2s

https://drive.google.com/open?id=1M7Kb27LcQBrCcZmJZVo5mx9OCXizBPvW

CSE LAB OBSERVATION'S FOR II,III,IV YEAR - I SEM

https://drive.google.com/open?id=0B1cLL4GgUF32aTJqaW45aGRyYTA

OPERATING SYSTEM LAB OBSERVATION

https://drive.google.com/open?id=0B1cLL4GgUF32X0llaFd6RUctVzA

COMPILER DESIGN LAB OBSERVATION

https://drive.google.com/open?id=0B1cLL4GgUF32aFgzOXozQ0x3OFk

LEXICAL ANALYSIS

LEXICAL ANALYSIS PPT
 

LEX PROGRAMS

----------------------------------------------------------------------------------------------------------------------
BASIC LEX PROGRAM TO FIND THE USER LOG IN
-------------------------------------------------------------------------------------------------------------------------
*  with the user's login name (e.g. lgao)
 * Usage: (1) $ flex sample1.lex
 *        (2) $ gcc lex.yy.c -lfl
 *        (3) $ ./a.out
 *            stdin> username
 *          stdin> Ctrl-D
 * Question: What is the purpose of '%{' and '%}'?
 *           What else could be included in this section?
 */

%{
/* need this for the call to getlogin() below */
#include
%}

%%
username    printf("%s\n", getlogin());
%%

main()
{
  yylex();
}
-------------------------------------------------------------------------------------------------------------------------
PROGRAM NO :2 LEX PROGRAM TO DISPLAY VERB OR NOT/ NUMBER TYPE
---------------------------------------------------------------------------------------------------------------------------
%{
/*PROG NO :2 LEX PROGRAM TO DISPLAY VERB OR NOT/*/
%}

%%
raj |
kiran |
sony |
pranathi |
ravi   printf("\n%s is a NOUN",yytext);
singing |
dancing |
sleeping |
crawling |
jumping   {printf("\n%s is a VERB",yytext); printf("\n\t**Just a 2nd Line**");}
[a-zA-Z]+ printf("\n%s is not a verb\n",yytext);
[0][0-9]* printf("\n%s is an OCTAL Number", yytext);
[x|X][0-9A-F]* printf("\n%s is an HEXA DECIMAL Number", yytext);
[0-9]+[0-9]* printf("\n%s is a NUMBER", yytext);
.    printf("\n\t\t\tUnexpected or a Spl Char\n");
%%

int main()
{
    yylex();
    return 0;
}
int yywrap()
{
  return 0;
}

/*
OUTPUT:
D:\CDProgs>flex lex1.l
D:\CDProgs>gcc lex.yy.c
D:\CDProgs>a
raj  sleeping ravi singing 04563  x98AF  fine
raj is a NOUN
                        Unexpected or a Spl Char

                        Unexpected or a Spl Char
sleeping is a VERB
        **Just a 2nd Line**
                        Unexpected or a Spl Char
ravi is a NOUN
                        Unexpected or a Spl Char
singing is a VERB
        **Just a 2nd Line**
                        Unexpected or a Spl Char
04563 is an OCTAL Number
                        Unexpected or a Spl Char
                        Unexpected or a Spl Char
x98AF is an HEXA DECIMAL Number
                        Unexpected or a Spl Char
                        Unexpected or a Spl Char
fine is not a verb
*/
-------------------------------------------------------------------------------------------------------------------------
PROGRAM-3- GIVEN INPUT IS WORD OR TEXT
--------------------------------------------------------------------------------------------------------------------------
%{
#include
%}

%%

[a-zA-z]+    printf("[%s] is a word",yytext);
.            printf("[%s] is a char",yytext);
%%


int main(void)
{
   yylex();
   return 0;
}
int yywrap()
{
  return 0;
}