Write an application to parse input text file concurrently and compare the result of concurrent parsing with serial parsing ( Use concurrent YACC parser)

CODE(assign.l):

%{
#include<stdio.h>
#include "y.tab.h"

#define YYSTYPE int    //to avoid global var coz multiple instances
%}
%option reentrant bison-bridge

%%
[0-9]+ {
          *yylval=atoi(yytext);    //to refer to address of yylval
          return NUMBER;
       }
[\t] ;
[\n] return 0;
. return yytext[0];
%%
int yywrap(yyscan_t yyscanner)  //parser object in bracket
{
return 1;
}


CODE(assign.y):

 %{
    #include<stdio.h>
    #include<stdlib.h>
    #include<omp.h>
   
    #define YYSTYPE int

    int numofthreads,expsperthread;
    char inputfilename[30];
%}
%token NUMBER

%left '+' '-'
%left '*' '/' '%'
%left '(' ')'

%pure-parser
%lex-param {void * scanner}
%parse-param {void * scanner}

%%

ArithmeticExpression: E{
         
         //printf("\nResult=%d\n",$$);
     
         return $$;
        }
E:E'+'E {$$=$1+$3;}
 |E'-'E {$$=$1-$3;}
 |E'*'E {$$=$1*$3;}
 |E'/'E {$$=$1/$3;}
 |E'%'E {$$=$1%$3;}
 |'('E')' {$$=$2;}
 | NUMBER {$$=$1;}
;

%%

void func()
{
void * scanner;
    yylex_init(&scanner);        /*parser object created ie scanner initialized and destroyed*/

FILE *fp;
fp=fopen(inputfilename,"r");

int i,j;

int tid;
int res;
 
tid=omp_get_thread_num();

char *s=malloc(100);
size_t n=100;

for(i=0;i<(expsperthread*tid);i++)        //to skip some lines
  {
    getline(&s,&n,fp);
  }

yyset_in(fp,scanner);

for(j=0;j<expsperthread;j++)
  {
    res=yyparse(scanner);            //invoking parser  which invokes lexer

    printf("%dth Expression=%d is given by Thread %d\n",(expsperthread*tid+j+1),res,tid);
  }

    yylex_destroy(scanner);

fclose(fp);
}

void main()
{
printf("Enter Input Text File Name\n");
scanf("%s",inputfilename);
printf("Enter Number of threads to be created\n");
scanf("%d",&numofthreads);
printf("Enter Number of Arithmetic Expressions to be evaluated by each thread\n");
scanf("%d",&expsperthread);

#pragma omp parallel num_threads(numofthreads)
  {
    func();
  }
}

int yyerror()
{
   printf("\nArithmetic expression is Invalid\n\n");
}

CODE(file.txt):

2+3
3+4
4+5
5+6
1*2
2*3
3*4
4*5
5*6
2-1
3-2
4-3
5-4
6-5
7+5
5*7
34+790
120+210
12*23
1+2

OUTPUT:

[pl3@pl3]$ lex test.l
[pl3@pl3]$ yacc -d test.y
[pl3@pl3]$ ls
a.out  lex.yy.c  file.txt  assign.l  assign.l~  assign.y  assign.y~  y.tab.c  y.tab.h
[pl3@pl3]$ gcc -fopenmp lex.yy.c y.tab.c
[pl3@pl3]$ ./a.out
Enter Input Text File Name
test1.txt
Enter Number of threads to be created
5
Enter Number of Arithmetic Expressions to be evaluated by each thread
3
7th Expression=12 is given by Thread 2
13th Expression=1 is given by Thread 4
14th Expression=1 is given by Thread 4
15th Expression=12 is given by Thread 4
4th Expression=11 is given by Thread 1
8th Expression=20 is given by Thread 2
1th Expression=5 is given by Thread 0
9th Expression=30 is given by Thread 2
10th Expression=1 is given by Thread 3
2th Expression=7 is given by Thread 0
3th Expression=9 is given by Thread 0
5th Expression=2 is given by Thread 1
11th Expression=1 is given by Thread 3
6th Expression=6 is given by Thread 1
12th Expression=1 is given by Thread 3
[cnlab@localhost 3]$ ./a.out
Enter Input Text File Name
test1.txt
Enter Number of threads to be created
3
Enter Number of Arithmetic Expressions to be evaluated by each thread
3
7th Expression=12 is given by Thread 2
8th Expression=20 is given by Thread 2
1th Expression=5 is given by Thread 0
9th Expression=30 is given by Thread 2
4th Expression=11 is given by Thread 1
5th Expression=2 is given by Thread 1
6th Expression=6 is given by Thread 1
2th Expression=7 is given by Thread 0
3th Expression=9 is given by Thread 0