/* =====================================================
   Thread example: intro to multi-threaded programming
   ===================================================== */

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

pthread_t tid[100];

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

   i = pthread_self();

   cout << "Hello, I am thread # " << i << endl;

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

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

int main(int argc, char *argv[])
{
   int i, num_threads;

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

   cout << "Hello, I am the main thread, and my id is " << pthread_self() <<
	   endl << endl;

   /* -----
      Get number of intervals and number of threads
      ----- */
   num_threads = atoi(argv[1]);
   cout << "I will make " << num_threads << " threads now..." << endl << endl;

   /* ------
      Create threads
      ------ */
   for (i = 0; i < num_threads; i = i + 1)
   {
      if ( pthread_create(&tid[i], NULL, worker, NULL) )
      {
	 cout << "Cannot create thread" << endl;
	 exit(1);
      }
   }

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