dsxf

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
pthread_t tid[2];
int x,step;
void* thread_change_number(void *n)
{
    pthread_t id = pthread_self();
    int i = (int)n;
    //if statement to check the id of the thread
    if(pthread_equal(id,tid[0]))
    {
        // first thread
    x=x+i;
        printf("inside the first thread(x+1)\n");
    printf("x= %d\n",x);
    }
    else
    {
        //second thread
    x=x+i;
        printf("inside the second thread(x-1)\n");
        printf("x= %d\n",x);
    }

}
 //change number fuction
int change_number(int x,int step){
    return x+step;
}
int main(int argc, char **argv)
{
    printf("--beginning of program\n");
    printf("give X\n");
    scanf("%d",&x);
    printf("x= %d\n",x);
    pid_t pid = fork();
    if (pid == 0)
    {
        // child process
    x=change_number(x,2);
    printf("inside child process(x+2)\n");
    printf("x=%d\n",x);
    //thread creation
        pthread_create(&(tid[0]), NULL, &thread_change_number,(void *)1);
    pthread_create(&(tid[1]), NULL, &thread_change_number,(void *)-1);
    sleep(3);
    }
    else if (pid > 0)
    {
        // parent process
        x=change_number(x,-1);
        printf("inside parent process(x-1)\n");
        printf("x=%d\n",x);
    sleep(4);
    }
    else
    {
        // fork failed
        printf("fork() failed!\n");
        return 1;
    }

    printf("\n--end of program--\n");

    return 0;
}