gdb/testsuite/gdb.threads/manythreads.c

/* Manythreads test program.
   Copyright 2004-2013 Free Software Foundation, Inc.

   Written by Jeff Johnston <jjohnstn@redhat.com> 
   Contributed by Red Hat

   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>
#ifdef DEBUG
#include <stdio.h>
#endif
#include <limits.h>

void *
thread_function (void *arg)
{
  int x = * (int *) arg;

#ifdef DEBUG
  printf ("Thread <%d> executing\n", x);
#endif /* DEBUG */

  return NULL;
}

int 
main (int argc, char **argv)
{
  pthread_attr_t attr;
  pthread_t threads[256];
  int args[256];
  int i, j;

  pthread_attr_init (&attr);

#ifdef PTHREAD_STACK_MIN
  pthread_attr_setstacksize (&attr, 2*PTHREAD_STACK_MIN);
#endif

  /* Create a ton of quick-executing threads, then wait for them to
     complete.  */
  for (i = 0; i < 1000; ++i) 
    {
      for (j = 0; j < 256; ++j)
	{
	  args[j] = i * 1000 + j;
	  pthread_create (&threads[j], &attr, thread_function, &args[j]);
	}

      for (j = 0; j < 256; ++j)
	{
	  pthread_join (threads[j], NULL);
	}
    }

  pthread_attr_destroy (&attr);

  return 0;
}