#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>    // POSIX Threads

using namespace std;

// prototype for thread routine
void *print_message_function1 ( void *ptr );
void *print_message_function2 ( void *ptr );

// 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;
} thdata;

int main()
{
  pthread_t thread1, thread2;  // thread variables

  // create threads 1 and 2
  pthread_create (&thread1, NULL, print_message_function1, NULL);
  pthread_create (&thread2, NULL, print_message_function2, NULL);

  // Main block now waits for both threads to terminate, before it exits
  pthread_join(thread1, NULL);
  pthread_join(thread2, NULL);

  // exit
  exit(0);
} // main()

// Thread1 function
void *print_message_function1 ( void *ptr )
{
  thdata *data;

  // do the work
  int i;
  for (i=0;i<10;i++) {
    printf("Thread %d says %s \n", 1, "Hello");
  }
  pthread_exit(0);
}

// Thread2 function
void *print_message_function2 ( void *ptr )
{
  thdata *data;

  // do the work
  int i;
  for (i=0;i<10;i++) {
    printf("Thread %d says %s \n", 2, "World");
  }
  pthread_exit(0);
}