/* =================================================================
   Thread example: thread creation (with input parameter)
   ================================================================= */

#include <iostream.h>
#include <stdlib.h>
#include <pthread.h>

void *worker(void *arg)
{
   int x;

   x = * (int *) arg;

   cout << "Hi, my input parameter is " << x << endl;

   return(NULL);     /* Thread exits (dies) */
}

/* =======================
   MAIN
   ======================= */

int main(int argc, char *argv[])
{
   int i, num_threads;
   pthread_t tid[100];	/* Thread ID used for thread_join() */
   int param[100];	/* used to store parameters for threads */
   pthread_attr_t attr;    

   pthread_attr_init(&attr);         
   
   /* -----
      Check command line
      ----- */
   if ( argc != 2 )
   {
      cout << "Usage: " << argv[0] << " Num_Threads" << endl;
      exit(1);
   }

   /* -----
      Get number of intervals and number of threads
      ----- */
   num_threads = atoi(argv[1]);

   /* ------
      Create threads
      ------ */
   for (i = 0; i < num_threads; i = i + 1)
   {
      param[i] = 1001 + i;

      if ( pthread_create(&tid[i], &attr, worker, &param[i]) )
      {
	 cout << "Cannot create thread" << endl;
	 exit(1);
      }
   }

   for (i = 0; i < num_threads; i = i + 1)
      pthread_join(tid[i], NULL);
}