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/* Create threads from multiple threads in parallel.

   Copyright 2007, 2008 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <pthread.h>

#include <stdio.h>

#include <limits.h>

#define NUM_CREATE 1

#define NUM_THREAD 8

void *

thread_function (void *arg)

{

  int x = * (int *) arg;

  printf ("Thread <%d> executing\n", x);

  return NULL;

}

void *

create_function (void *arg)

{

  pthread_attr_t attr;

  pthread_t threads[NUM_THREAD];

  int args[NUM_THREAD];

  int i = * (int *) arg;

  int j;

  pthread_attr_init (&attr); /* set breakpoint 1 here.  */

  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);

  /* Create a ton of quick-executing threads, then wait for them to

     complete.  */

  for (j = 0; j < NUM_THREAD; ++j)

    {

      args[j] = i * 1000 + j;

      pthread_create (&threads[j], &attr, thread_function, &args[j]);

    }

  for (j = 0; j < NUM_THREAD; ++j)

    pthread_join (threads[j], NULL);

  pthread_attr_destroy (&attr);

  return NULL;

}

int

main (int argc, char **argv)

{

  pthread_attr_t attr;

  pthread_t threads[NUM_CREATE];

  int args[NUM_CREATE];

  int n, i;

  pthread_attr_init (&attr);

  pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);

  for (n = 0; n < 100; ++n)

    {

      for (i = 0; i < NUM_CREATE; i++)

        {

          args[i] = i;

          pthread_create (&threads[i], &attr, create_function, &args[i]);

        }

      create_function (&i);

      for (i = 0; i < NUM_CREATE; i++)

        pthread_join (threads[i], NULL);

    }

  pthread_attr_destroy (&attr);

  return 0;

}