/* Includes */
#include <unistd.h>     /* Symbolic Constants */
#include <sys/types.h>  /* Primitive System Data Types */ 
#include <errno.h>      /* Errors */
#include <stdio.h>      /* Input/Output */
#include <stdlib.h>     /* General Utilities */
#include <pthread.h>    /* POSIX Threads */
#include <string.h>     /* String handling */


int global; 
int status;     /* parent process: child's exit status */

/* struct to hold data to be passed to a thread
   this shows how multiple data items can be passed to a thread */
typedef struct str_thdata
{
  int thread_no;
  char message[100];
} thdata;


/* prototype for thread routine */
void childfoo(void* ptr)
{
	  
  thdata *data;         
  int local = 200;   
  data = (thdata *) ptr;  /* type cast to a pointer to thdata */
  global = 100;
  printf("CHILD: I am the child thread! PID: %d\n", getpid());
  printf("CHILD: My Value of global : %d\n", global); 
  printf("CHILD: My Value of local : %d\n", local); 
}


int main()
{
  pthread_t thread1;  /* thread variables */
  thdata data1;         /* structs to be passed to threads */
  int local = 300;   
  /* initialize data to pass to thread 1 */
  data1.thread_no = 1;
  strcpy(data1.message, "Hello!");

    
  /* create threads 1 and 2 */    
  pthread_create (&thread1, NULL, (void *) &childfoo, (void *) &data1);

  /* Main block now waits for both threads to terminate, before it exits
       If main block exits, both threads exit, even if the threads have not
       finished their work */ 
  pthread_join(thread1, NULL);
              
  printf("PARENT: I am the parent process  %d\n", getpid());
  printf("PARENT: My Value of global : %d\n", global); 
printf("PARENT: My Value of local : %d\n", local); 
  exit(0);  /* parent exits */       

} /* main() */