#include<stdio.h>
#include<pthread.h>

void* say_hello(void* data)
{
    char *str;
    str = (char*)data;
    printf("%s\n",str);
}


void main()
{
    pthread_t t1, t2, t3, t4;

    int childpid;

    childpid = fork();
    if (childpid == 0) {
        pthread_create(&t1,NULL,say_hello, "First thread from parent process");
        pthread_create(&t2,NULL,say_hello, "Second thread from parent process");
    }
    else {
        pthread_create(&t3,NULL,say_hello,"First thread from child process");
        pthread_create(&t4,NULL,say_hello,"Second thread from child process");
    }
    waitpid(childpid, NULL, 0);
}