1. Explain in your own words the following code:

#include

#include

int value;

void *my_thread(void *param);

main (int argc, char *argv[])

{pthread_t tid; int retcode;

//what does this do

if (argc != 2) {

fprintf (stderr, "usage: a.out ");

exit(0);

}

//what does this do

retcode = pthread_create(&tid,NULL,my_thread,argv[1]);

//what does this do

if (retcode != 0) {

fprintf (stderr, "Unable to create thread ");

exit (1);

}

// What does this do

pthread_join(tid,NULL);

printf ("I am the parent: Square = %d ", value);

} //main

// What does this do

void *my_thread(void *param)

• {

int i = atoi (param);

printf ("I am the child, passed value %d ", i);

value = i * i;

pthread_exit(0);

• }

2. What would be the output of the executable of above program: if the following are input at the command prompt:
3. ./a.out
4. ./a.out 5