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Engineering · Computer Science
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  1. Explain in your own words the following code:                                                     

#include<pthread.h>

#include <stdio.h>

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 <integer value>\n");

     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\n");

                        exit (1);

            }

// What does this do

            pthread_join(tid,NULL);

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

} //main

// What does this do

void *my_thread(void *param)

  • {

            int i = atoi (param);

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

            value = i * i;

            pthread_exit(0);

  • }

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